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FUJITSU SEMICONDUCTOR DATA SHEET
DS04-27216-2E
ASSP For Power Supply Applications
BIPOLAR
Switching Regulator Controller
MB3817
s DESCRIPTION
The MB3817 is a pulse width modulator (PWM) type switching regulator controller IC designed for low-voltage and high-speed operation. This can be used in applications as down-conversion or down/up-conversion (Zeta method). With fewer external components and faster operating speed, the MB3817 enables reduction in power supply unit size, making it ideal for use with internal power supplies in compact, high-performance portable devices.
s FEATURES
* * * * * * * * * Wide range of operating power supply voltages: 2.5 V to 18 V Built-in high-precision reference voltage generator: 1.5 V 2% High speed operation is possible: Max. 500 kHz Wide input voltage range of error amplifier: 0 to VCC - 0.9 V Built-in soft start function Built-in timer/latch-actuated short-circuiting protection circuit Totem-pole type output with adjustable on/off current (for PNP transistors) Built-in standby function Small package: SSOP-16P (FPT-16P-M05)
s PACKAGE
16-pin Plastic SSOP
(FPT-16P-M05)
MB3817
s PIN ASSIGNMENT
(TOP VIEW)
CT
1
16
VREF
RT +IN -IN
2
15
CTL
3
14
CSCP
4
13
CS
FB
5
12
GND
DTC
6
11
VE
CB1
7
10
OUT
CB2
8
9
V CC
(FPT-16P-M05)
2
MB3817
s PIN DESCRIPTION
Pin no. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pin name CT RT +IN -IN FB DTC CB1 CB2 VCC OUT VE GND CS CSCP CTL VREF I/O -- -- I I O I -- -- -- O -- -- -- -- I O Descriptions This pin connects to a capacitor for setting the triangular-wave frequency. This pin connects to a resistor for setting the triangular-wave frequency. Error amplifier non-inverted input pin Error amplifier inverted input pin Error amplifier output pin Dead time control pin Boot capacitor connection pin Boot capacitor connection pin Power supply pin Totem-pole type output pin Output current setting pin Ground pin Soft start setting capacitor connection pin Short detection setting capacitor connection pin Power supply control pin When this pin is High, IC is inactive state When this pin is Low, IC is standby state Reference voltage output pin
3
MB3817
s BLOCK DIAGRAM
OUT FB 5 -IN +IN DTC 4 3 6 CS CS 13 1 Q1 Soft Start - Comp. + (0.9 V) - + 1.5 V SCP 1 -1.4 V -1.0 V OSC bias RS Latch 2 CT RT UVLO Q2 Q3 bias VCC SCP Comp. Q5 Q6 D1 (0.5 V) Error - Amp. + PWM + Comp. + + -
CB1 7 8 CB2 9
OFF current setting block
Q4 10
VCC
OUT
11 VE
Power Ref (1.5 V) ON/OFF 12 GND
15
CTL
1
14 16 CSCP VREF
4
MB3817
s ABSOLUTE MAXIMUM RATINGS
Parameter Power supply voltage Power dissipation Storage temperature Symbol VCC PD Tstg Ta Condition -- +25C -- Rating Min. -- -- -55 Max. 20 440* +125 Unit V mW C
* : The package is mounted on the epoxy board (10 cm x 10 cm). WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current, temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.
s RECOMMENDED OPERATING CONDITIONS
Parameter Power supply voltage Reference voltage output current Error amp. input voltage Control input voltage Output current Timing capacitance Timing resistance Oscillation frequency Soft start capacitance Short detection capacitance Boot capacitance Operating temperature Symbol VCC IOR VIN VCTL IO CT RT fOSC CS CSCP CB Ta Condition -- -- -- -- -- -- -- -- -- -- -- -- Value Min. 2.5 -1 0 0 3 150 5.1 10 -- -- -- -40 Typ. 6.0 -- -- -- -- -- -- 200 0.1 0.1 -- +25 Max. 18 0 VCC - 0.9 18 30 1500 100 500 1.0 1.0 0.1 +85 Unit V mA V V mA pF k kHz F F F C
WARNING: Recommended operating conditions are normal operating ranges for the semiconductor device. All the device's electrical characteristics are warranted when operated within these ranges. Always use semiconductor devices within the recommended operating conditions. Operation outside these ranges may adversely affect reliability and could result in device failure. No warranty is made with respect to uses, operating conditions, or combinations not represented on the data sheet. Users considering application outside the listed conditions are advised to contact their FUJITSU representative beforehand.
5
MB3817
s ELECTRICAL CHARACTERISTICS
(VCC = 6 V, Ta = +25C) Parameter Output voltage Output temperature stability Reference section (Ref) Input stability Load stability Short circuit output current Under voltage lockout protection section (UVLO) Threshold voltage VTL Hysteresis width Reset voltage Threshold voltage Soft start section Input standby (CS) voltage Charge current Threshold voltage Input standby Short circuit detection section voltage (SCP) Input latch voltage Input source current Oscillator frequency Triangular waveform Frequency voltage oscillator section stability (OSC) Frequency temperature stability * : Standard design value. VH VR VT0 VT100 VSTB ICHG VTH VSTB VI II fOSC f/fdv f/fdt 13 13 13 10 10 13 13 14 14 14 14 10 10 10 Symbol VREF VREF/ VREF Line Load IOS VTH Pin no. 16 16 16 16 16 13 Condition -- Ta = -40C to +85C VCC = 2.5 V to 18 V IOR = 0 mA to -1 mA VREF = 1 V VCC = VCC = -- -- Duty cycle = 0 % Duty cycle = 100 % -- -- -- -- -- -- CT = 330 pF RT = 6.2 k VCC = 3.6 V to 16 V Ta = -40C to +85C Value Min. 1.47 -- -- -- -10 -- 1.5 0.1 0.6 0.9 -- -- -1.4 0.60 -- -- -1.4 450 -- -- Typ. 1.50 0.5* 2 2 -5 2.0 1.8 0.2 1.0 1.0 1.4 50 -1.0 0.65 50 50 -1.0 500 1 1* Max. 1.53 -- 10 10 -2 2.3 -- -- -- -- 1.5 100 -0.6 0.70 100 100 -0.6 550 10 -- Unit V % mV mV mA V V V V V V mV A V mV mV A kHz % %
(Continued)
6
MB3817
(Continued)
(VCC = 6 V, Ta = +25C) Parameter Input offset voltage Input offset current Input bias current Common mode input voltage range Error amp. section (Error Amp.) Common mode rejection ratio Voltage gain Frequency bandwidth Maximum output voltage width Output sink current Output source current Threshold voltage Dead time control section (DTC) ON duty cycle Input current PWM comparator section (PWM Comp.) Threshold voltage Input sink current Input source current Output sink current Output section (OUT) Output source current Standby leakage current Control section (CTL) Input current Standby current Power supply current * : Standard design value. Input on condition Input off condition Symbol VIO IIO II VCM CMRR AV BW VOM+ VOM- IO+ IO- VT0 VT100 Dtr IDTC VT0 VT100 II
+
Pin no.
Condition
Value Min. -- -- -200 0 60 60 -- 1.8 -- 60 -- 0.9 -- 70 -500 0.9 -- 60 -- 18 -- -- 2.1 0 -- -- -- Typ. -- -- -100 -- 100 100 800* 2.0 50 120 -2.0 1.0 1.4 80 -250 1.0 1.4 120 -2.0 30 -100 -- -- -- 100 -- 2.7 Max. 10 100 -- VCC - 0.9 -- -- -- -- 500 -- -0.6 -- 1.5 90 -- -- 1.5 -- -0.6 42 -50 10 18 0.7 200 10 4.0
Unit mV nA nA V dB dB kHz V mV A mA V V % nA V V A mA mA mA A V V A A mA
3, 4 VFB = 1.2 V 3, 4 VFB = 1.2 V 3, 4 VFB = 1.2 V 3, 4 5 5 5 5 5 5 5 10 10 10 6 10 10 5 5 10 10 10 11 11 15 9 9 DC DC AV = 0 dB -- -- VFB = 1.2 V VFB = 1.2 V Duty cycle = 0 % Duty cycle = 100 % VDTC = VREF x 0.88 CT = 330 pF, RT = 6.2 k VDTC = 0 V Duty cycle = 0 % Duty cycle = 100 % -- -- RE = 15 k Duty 5% --
II- IO+ IO- ILO VON VOFF II ICCS ICC
VCC = 18 V, VO = 18 V -- -- VCTL = 5 V VCTL = 0 V Output "H"
7
MB3817
s TYPICAL CHARACTERISTICS
Power supply current vs. power supply voltage
5 Ta = +25 C Power supply current ICC (mA) 4 3 2 1 0 0 2 4 6 8 10 12 14 16 18 20 Power supply voltage VCC (V) Reference voltage VREF (V) 1.5 2.0 Ta = +25 C IOR = 0 mA
Reference voltage vs. power supply voltage
1.0
0.5
0.0 0 2 4 6 8 10 12 14 16 18 20 Power supply voltage VCC (V)
Reference voltage vs. ambient temperature
1.55 1.54 Reference voltage VREF (V) 1.53 1.52 1.51 1.50 1.49 1.48 1.47 1.46 1.45 -60 -40 -20 0 20 40 60 80 100 VCC = 6 V IOR = 0 mA
Ambient temperature Ta (C)
Reference voltage vs. control voltage
500 1.7 Reference voltage VREF (V) 1.6 1.5 1.4 1.3 0 0 1 2 3 4 5 0 VCC = 6 V Ta = +25 C IOR = 0 mA 400 300 200 100
Control current vs. control voltage
VCC = 6 V Ta = +25 C
Control current ICTL (A)
4
8
12
16
20
Control voltage VCTL (V)
Control voltage VCTL (V)
(Continued)
8
MB3817
Triangular wave frequency fOSC (Hz)
10 M VCC = 6V Ta = +25 C 1M
Triangular wave maximum amplitude voltage VCT (V)
Triangular wave frequency vs. timing resistance
Triangular wave maximum amplitude voltage vs. timing capacitance
1.8 1.6 1.4 1.2 1.0 0.8 0.6 10 VCC = 6 V Ta = +25 C RT = 6.2 k
100 k
10 k CT = 15000 pF 1k 1k 10 k 100 k CT = 1500 pF
CT = 150 pF
1M
102
103
104
105
Timing resistance RT ()
Timing capacitance CT (pF)
Duty vs. triangular wave frequency
100 80 Duty Dtr (%) 60 40 20 0 1k VCC = 6 V Ta = +25 C RT = 6.2 k VDTC = VREF x 0.88 1000 Triangular wave cycle tOSC (sec)
Triangular wave cycle vs. timing capacitance
100 VCC = 6 V Ta = +25 C RT = 6.2 k
10
1
10 k
100 k
1M
10 M
0.1 10
102
103
104
105
Triangular wave frequency fOSC (Hz)
Timing capacitance CT (pF)
Frequency stability vs. ambient temperature
10.00 VCC = 6 V fOSC = 500 kHz (CT = 330 pF, RT = 6.2 k)
Frequency stability (%)
5.00
0.00
-5.00
-10.00 -60
-40
-20
0
20
40
60
80
100
Ambient temperature Ta (C)
(Continued)
9
MB3817
(Continued)
Error amp. frequency
50 40 30 20 Av (dB) 10 0 -10 -20 -30 -40 -50 1k 10 k 100 k Frequency fOSC (Hz) 1M 10 M Av Ta = +25 C 225 180 135 90
* Measurement circuit
VCC = 6 V 11 k (deg) -+ 10 F 11 k VREF Error Amp. 2.4 k 240 k
45 0 -45 -90 -135 -180 -225
4- 5 3+
Output current setting pin voltage vs. output current setting pin current
Output current setting pin voltage VE (V) 1.0 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 0 -10 -20 -30 -40 -50 Power dissipation PD (mW) 0.9 VCC = 6 V Ta = +25 C 500 440 400 300 200 100
Power dissipation vs. ambient temperature
0 -40
-20
0
20
40
60
80
100
120
Output current setting pin current IE (mA)
Ambient temperature Ta (C)
10
MB3817
s FUNCTIONAL DESCRIPTION
1. Switching Regulator Functions
(1) Reference voltage circuit (Ref) The reference voltage circuit generates a temperature-compensated stable voltage (. .1.50 V). This reference = voltage is used as the reference voltage and bias level for the power control unit. (2) Triangular-wave oscillator circuit By connecting a timing capacitor and a resistor to the CT (pin1) and the RT (pin2) terminals, it is possible to generate any desired triangular oscillation waveform. (3) Error amplifier The error amp. is an amplifier circuit that detects the output voltage from the switching regulator and produces the PWM control signal. The broad in-phase input voltage range of 0 V to Vcc - 0.9 V provides easy setting from external power supplies and enables use with applications such as DC motor speed control systems. Also, it is possible to provide stable phase compensation for a system by setting up any desired level of loop gain, by connecting feedback resistance and a capacitor between the error amp. output pin (FB pin (pin 5)) and the inverse input pin (-IN pin (pin 4)). (4) PWM comparator (PWM Comp.) This is a voltage comparator with one inverted input and three non-inverted inputs, and operates as a voltagepulse width modulator controlling output duty in relation to input voltage. The output transistor is turned on during the interval in which the triangular waveform is lower than any of three voltages: the error amp. output voltage (FB pin (pin 5)), soft start set voltage (CS pin (pin 13)), or dwell time setting voltage (DTC pin (pin 6)). (5) Output circuits (OUT) The output circuit has totem pole type configuration, and can drive an external PNP transistor. The on current value can be set up to a maximum of 30 mA using the resistance (RE) connected to the VE pin (pin 11). The off current is set by connecting a bootstrap capacitor CB between the CP1 pin (pin 7) and CP2 pin (pin 8).
2. Power Supply Control Functions
The output is switched on and off according to the voltage level at the CTL pin (pin 15). CTL pin voltage level L( H( 0.7 V) 2.1 V) Channel on/off status Standby mode* Operating mode
* : Supply current in standby mode is 10 A or less.
3. Protective Circuit Functions
(1) Soft start and short protection circuits (CS, SCP) Soft starting, by preventing a rush current at power-on, can be provided by connecting a capacitor CS to the CS pin (pin 13). After the soft start operation is completed, the CSCP pin (pin 14) is held at "L" level (standby voltage VSTB), which functions as short detection standby mode. If an output short causes the error amp. output to rise above 1.5 V, capacitor CSCP begins charging, and after reaching threshold voltage VTH of 0.65 V causes the OUT pin (pin 10) to be fixed at "H" level and the dwell time to be set to 100%, and the CSCP pin (pin 14) is held at "L" level. Once the protection circuit has been activated, the power supply must be reset to restore operation. 11
MB3817
(2) Low input voltage error prevention circuit (UVLO) Power-on surges and momentary drops in power supply voltage can cause errors in control IC operation, which can destroy or damage systems. The low input voltage error protection circuit compares the supply voltage to the internal reference voltage, and sets the OUT pin (pin 10) to "H" level in the event of a drop in supply voltage. Operation is restored when the power supply voltage returns above the threshold voltage of the low input voltage error prevention circuit.
12
MB3817
s SETTING OUTPUT VOLTAGE
* Output voltage VO is plus
V0+
R1 -IN 4 +IN R2 3 Error Amp. - + V0+ = VREF R2 (R1 + R2)
VREF
* Output voltage VO is minus
VREF
R2
R
-IN 4 +IN 3
Error Amp. - + V0- = - VREF 2 x R2 (R1 + R2) + VREF
R1
R
V0-
13
MB3817
s METHOD OF SETTING THE OUTPUT CURRENT
The output circuit is comprised of a totem-pole configuration. Its output current waveform is such that the ONcurrent value is set by constant current and the OFF-current value is set by a time constant. These output currents are set using the equations below. ON current: IO+ [mA] . . = 500 (Voltage on output current-setting pin VE = 0.5 V) RE []
OFF current: OFF-current time constant = proportional to the value of CB * Output circuit
CB1 CB CB2 Outside putting PNP transistor 9
OFF current setting block
7 8
VCC OFF current
Q4
10 Q6 Q5 D1 (0.5 V)
OUT RE VE
ON current 11
* Output current waveform
ON current
Output current
0
OFF current
t
14
MB3817
* Voltage and current waveforms on output pin
4 2 VO (V) 0 -2 -4
VCC = 3 V
40 IO (mA) 20 0 -20
0
2
4 t (s)
6
8
10
* Measuring circuit diagram
7 8
CB1 CB 1000 pF CB2 VCC VCC 2S81121S U1FWJ44N (5.0 V)
9
35 k OUT RE 22 F VE 16 VO 22 F 10
15 k Pin 4
11
15
MB3817
s METHOD OF SETTING THE SHORT DETECTION TIME
The error amp. output is connected to the inverted input of the short detector comparator circuit (SCP Comp.), where it is constantly compared to the reference voltage of approximately 1.5 V that is connected to the noninverted input. If the switching regulator load conditions are stabilized, the short detector comparator output is at "H" level, transistor Q3 is on, and the CSCP pin (pin14) holds the input standby voltage VSTB which is 50 mV. If load conditions change rapidly due to a cause such as a load short, so that output voltage falls, the short detector comparator circuit output changes to "L" level. When this happens, transistor Q3 turns off and the short detector capacitor CSCP connected externally to the CSCP pin starts charging from the input source current II, which is -1.0 A. Short detection time (tPE) tPE [s] . . 0.65 x CSCP [F] = When the short detector capacitor CSCP has been charged to the threshold voltage VTH, which is 0.65 V, the SR latch is set, and the external PNP transistor is turned off (setting dwell time to 100%). At this time, the SR latch input is closed, and the CSCP pin is set to input latch voltage VI which is 50 mV. * Short protection circuit
FB 5 -IN +IN 4 3 - + Error Amp. + + + - PWM Comp.
OFF current setting block
Outside putting PNP transistor 9 Q4 10 OUT Q6 SCP Comp. Q5 D1 (0.5V) 11 VE RE VCC
- +
1.5 V
1 bias RS Latch UVLO Q2 Q3
14 CSCP
16
MB3817
s TREATMENT WHEN NOT USING CSCP
When you do not use the timer/latch-actuated short-circuiting protection circuit, connect the CSCP terminal (pin 14) to GND. * Treatment when not using CSCP
14
CSCP
17
MB3817
s METHOD OF SETTING SOFT START TIME
To protect against surge currents when the IC is turned on, a soft start setting can be made by connecting a soft start capacitor (CS) to the CS pin (pin 13). When the IC starts up (CTL pin (pin 15) to "H" level, Vcc UVLO threshold voltage VTH) the transistor Q1 turns off and the soft start capacitor (CS) connected to the CS pin begins charging from the charge current ICHG which is -1.0 A. At this time, if the CS pin voltage is less than 0.9 V, the soft start comparator circuit output goes to "H" level, transistor Q2 turns on and the CSCP pin (pin 14) holds input standby voltage VSTB which is 50 mV so that the short protection circuit is not activated. When the CS pin voltage is greater than or equal to 0.9 V, transistor Q2 turns off, the PWM comparator circuit compares the CS pin voltage with the triangular wave and changes the ON duty of the OUTPUT pin, thus achieving a soft start. Note that the soft start time is determined by the following formula. Soft start time (time before output ON duty reaches 50%) tS [ms] . . 1.2 x CS [F] = * Soft start circuit
Outside putting PNP transistor + + + - PWM Comp.
OFF current setting block
9 Q4 10 OUT VCC
1 CS 13 Q1 - + (0.9 V) 1 bias RS Latch UVLO Q2 Q3 Soft Start Comp. Q5 D1 (0.5V)
Q6 11 VE
RE
14 CSCP
18
MB3817
s TREATMENT WHEN NOT USING CS
When not using the soft start function, the CS pin (pin 13) should be left open.
* When no soft start time is set
Open 13 CS
19
MB3817
s METHOD OF SETTING THE DEAD TIME
When the device is set for step-up inverted output based on the flyback method, the output transistor is fixed to a full-on state (ON-duty = 100 %) at power switch-on. To prevent this problem, you may determine the voltages on the DTC terminals (pin 6) from the VREF voltage so you can easily set the output transistor's dead time (maximum ON-duty) independently for each channel as shown below. When the voltage on the DTC terminals (pin 6) is lower than the triangular-wave output voltage from the oscillator, the output transistor turns off. The dead time calculation formula assuming that triangular-wave amplitude 0.4 V and triangular-wave minimum voltage 1.4 V is given below. Duty (ON)MAX . . Vdt - 1.0 V x 100 [%] = 0.4 When you do not use these DTC terminals, connect them to VREF terminal. * When using DTC to set dead time
16 VREF Ra 6 Vdt Rb DTC
* When not using DTC to set dead time
16 VREF
6
DTC
20
MB3817
s EQUIVALENT SERIES RESISTOR AND STABILITY OF SMOOTHING CAPACITOR
The equivalent series resistance (ESR) of a smoothing capacitor in a DC/DC converter greatly affects the phase characteristics of the loop depending on its value. System stability is improved by ESR because it causes the phase to lead that of the ideal capacitor in highfrequency regions. (See Figures 2 and 3) Conversely, if a low-ESR smoothing capacitor is used, system stability deteriorates. Therefore, use of a low-ESR semiconductor electrolytic capacitors (ex. OS-CON) or tantalum capacitors calls for careful attention. * Figure 1 Basic circuit of stepdown DC/DC converter
Tr
L
RC V IN D C RL
* Figure 2 Gain-Frequency characteristic
* Figure 3 Phase-Frequency characteristic
20
0
0 Gain AV (dB) Phase (deg) -20 -40 -60 10 -90
(2)
(2)
(1) : RC = 0 (2) : RC = 31 m 100 1k
(1) 10 k 100 k
-180 10
(1) : RC = 0 (2) : RC = 31 m
(1)
100
1k Frequency f (Hz)
10 k
100 k
Frequency f (Hz)
21
MB3817
(Reference Data) The phase margin is halved by changing the smoothing capacitor from an aluminium electrolytic capacitor (RC ~ 1.0 ) to a small-ESR semiconductor electrolytic capacitor (OS - CON; RC ~ 0.2 ). (See Figure 5 and 6.) * Figure 4 DC/DC converter AV - characteristic measuring circuit
VOUT VO +
CNF
AV - characteristic between this interval - + -IN +IN R1 VIN R2
FB
VREF Error amp.
* Figure 5 Gain-Frequency characteristic
Gain - frequency and phase frequency characteristics of Al electrolytic capacitor (DC/DC converter +5 V output) 60 40 Gain AV (dB) 20 0 -20 -40 10 62 VCC = 10 V RL = 25 CP = 0.1 F 180 VO 90 0 -90 -180 100 k Phase (deg)
+
AV
+ Al electrolytic capacitor 220 F (16 V) - RC 1.0 : FOSC = 1 kHz GND
100
1k Frequency f (Hz)
10 k
* Figure 6 Phase-Frequency characteristic
Gain - frequency and phase frequency characteristics of OS - CON (DC/DC converter +5 V output) 60 AV 40 Gain AV (dB) 20 0 -20 -40 10 27 VCC = 10 V RL = 25 CP = 0.1 F
180 VO 90 0 -90 -180 100 k Phase (deg)
+
+ OS - CON 22 F (16 V) - RC 0.2 : fOSC = 1 kHz GND
100
1k Frequency f (Hz)
10 k
22
1. Step-down scheme
7 8 CB2 Error Amp1 PWM Comp. 9
OFF current setting block
CB1 1000 pF VO (3.3 V)
s APPLICATION EXAMPLE
18 k OUT Q4 10 OUT 22 F Q6 11 Q5 (0.5 V) VE U1FWJ44N
- - + +
FB 2SB1121S VCC 22 H
- + + + -
5 0.047 F 4 -IN 3 +IN
+
15 k 22 F
DTC
6 47
10 k
CS 1
15 4.7 F
VIN Soft Start Comp. SCP Comp.
CS
13
Q1
0.1 F (0.9 V) SCP 1 1.4 V bias 1.0 V RS Latch UVLO Ref Q2 1.5 V 2 RT 6.2 k 0.1 F 14 16 CSCP VREF Q3 Power ON/OFF bias VCC 1.5 V
OSC
2SB1121S: SANYO Electric Co., Ltd. UIFWJ44N: TOSHIBA CORPORATION
1
CT
CTL 15 (note) Output ON/OFF signal ON : CTL = 5 V OFF : CTL = 0 V 12 GND
1000 pF
MB3817
23
24
MB3817
2. Zeta scheme
7 8 CB2 Error Amp1
-
CB1 1000 pF VO (3.3 V)
18 k OUT 9
OFF current setting block
FB PWM Comp. VCC 22 H OUT 22 F 47 11 Q5 (0.5 V) VE U1FWJ44N Q1
- - + +
2SB1121S 4.7 F 22 H
15 k 10 Q6 22 F
5 0.047 F 4 -IN 3 +IN
+ + + + -
DTC
6
10 k
15 4.7 F
CS 1
VIN Soft Start Comp. SCP Comp.
CS
13
0.1 F
(0.9 V) 1.5 V SCP 1 1.4 V bias 1.0 V OSC UVLO RS Latch Q2 Q3 2 CT RT 6.2 k 0.1 F Ref Power ON/OFF 1.5 V 12 GND 14 16 CSCP VREF 15 bias
VCC CTL (note) Output ON/OFF signal ON : CTL = 5 V OFF : CTL = 0 V 2SB1121S: SANYO Electric Co., Ltd. UIFWJ44N: TOSHIBA CORPORATION
1
1000 pF
3. Flyback scheme
OUT 7 8 CB2 Error Amp. PWM Comp. 9
OFF current setting block
CB1 CB 1000 pF 2SB1121S U1FWJ44N VO (5.0 V)
35 k
R1
FB
5
0.047 F
+ + + + -
-IN Q4 10 CS Q6 11 VE Q5 D1 (0.5 V) OUT 22 F RE 16 22 F VCC
+IN
4
3
15 k
R2
1.2 k DTC
22 F
6
13 k
VIN Soft Start - Comp.
- + +
CS SCP Comp.
1
13
1 F
Q1
(0.9 V) 1.5 V SCP 1 -1.4 V -1.0 V OSC UVLO RS Latch Q2 Q3 2 CT 6.2 k 2.2 F RT bias bias VCC 15
Power Ref (1.5 V) ON/OFF 12
1
14 16 CSCP VREF
GND
CTL (note) Output ON/OFF signal ON : CTL = 5 V OFF : CTL = 0 V
2SB1121S: SANYO Electric Co., Ltd. UIFWJ44N: TOSHIBA CORPORATION
1000 pF
MB3817
25
MB3817
s USAGE PRECAUTIONS
1. Never use setting exceeding maximum rated conditions.
Exceeding maximum rated conditions may cause permanent damage to the LSI. Also, it is recommended that recommended operating conditions be observed in normal use. Exceeding recommended operating conditions may adversely affect LSI reliability.
2. Use this device within recommended operating conditions.
Recommended operating conditions are values within which normal LSI operation is warranted. Standard electrical characteristics are warranted within the range of recommended operating conditions and within the listed conditions for each parameter.
3. Printed circuit board ground lines should be set up with consideration for common impedance. 4. Take appropriate static electricity measures.
* * * * Containers for semiconductor materials should have anti-static protection or be made of conductive material. After mounting, printed circuit boards should be stored and shipped in conductive bags or containers. Work platforms, tools, and instruments should be properly grounded. Working personnel should be grounded with resistance of 250 k to 1 M between body and ground.
26
MB3817
s ORDERING INFORMATION
Part number MB3817PFV Package 16-pin Plastic SSOP (FPT-16P-M05) Remarks
27
MB3817
s PACKAGE DIMENSION
16-pin Plastic SSOP (FPT-16P-M05)
*: These dimensions do not include resin protrusion.
* 5.000.10(.197.004)
1.25 -0.10 .049 -.004
+0.20 +.008
(Mounting height)
0.10(.004)
INDEX
* 4.400.10
(.173.004)
6.400.20 (.252.008)
5.40(.213) NOM
0.650.12 (.0256.0047)
0.22 -0.05 .009
+0.10 +.004 -.002
"A"
0.15 -0.02 .006 -.001
+0.05 +.002
Details of "A" part 0.100.10(.004.004) (STAND OFF)
4.55(.179)REF
0
10
0.500.20 (.020.008)
C
1994 FUJITSU LIMITED F16013S-2C-4
Dimensions in mm (inches)
28
MB3817
FUJITSU LIMITED
For further information please contact:
Japan FUJITSU LIMITED Corporate Global Business Support Division Electronic Devices KAWASAKI PLANT, 4-1-1, Kamikodanaka Nakahara-ku, Kawasaki-shi Kanagawa 211-8588, Japan Tel: 81(44) 754-3763 Fax: 81(44) 754-3329
All Rights Reserved. The contents of this document are subject to change without notice. Customers are advised to consult with FUJITSU sales representatives before ordering. The information and circuit diagrams in this document are presented as examples of semiconductor device applications, and are not intended to be incorporated in devices for actual use. Also, FUJITSU is unable to assume responsibility for infringement of any patent rights or other rights of third parties arising from the use of this information or circuit diagrams. FUJITSU semiconductor devices are intended for use in standard applications (computers, office automation and other office equipment, industrial, communications, and measurement equipment, personal or household devices, etc.). CAUTION: Customers considering the use of our products in special applications where failure or abnormal operation may directly affect human lives or cause physical injury or property damage, or where extremely high levels of reliability are demanded (such as aerospace systems, atomic energy controls, sea floor repeaters, vehicle operating controls, medical devices for life support, etc.) are requested to consult with FUJITSU sales representatives before such use. The company will not be responsible for damages arising from such use without prior approval. Any semiconductor devices have an inherent chance of failure. You must protect against injury, damage or loss from such failures by incorporating safety design measures into your facility and equipment such as redundancy, fire protection, and prevention of over-current levels and other abnormal operating conditions. If any products described in this document represent goods or technologies subject to certain restrictions on export under the Foreign Exchange and Foreign Trade Law of Japan, the prior authorization by Japanese government will be required for export of those products from Japan.
http://www.fujitsu.co.jp/
North and South America FUJITSU MICROELECTRONICS, INC. Semiconductor Division 3545 North First Street San Jose, CA 95134-1804, USA Tel: (408) 922-9000 Fax: (408) 922-9179 Customer Response Center Mon. - Fri.: 7 am - 5 pm (PST) Tel: (800) 866-8608 Fax: (408) 922-9179
http://www.fujitsumicro.com/
Europe FUJITSU MIKROELEKTRONIK GmbH Am Siebenstein 6-10 D-63303 Dreieich-Buchschlag Germany Tel: (06103) 690-0 Fax: (06103) 690-122
http://www.fujitsu-ede.com/
Asia Pacific FUJITSU MICROELECTRONICS ASIA PTE LTD #05-08, 151 Lorong Chuan New Tech Park Singapore 556741 Tel: (65) 281-0770 Fax: (65) 281-0220
http://www.fmap.com.sg/
F9812 (c) FUJITSU LIMITED Printed in Japan

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