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Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER AP3700
General Description
The AP3700 is a green-mode pulse width modulation (PWM) controller. It is specially designed for low power applications such as off-line battery chargers, where the needs for low standby power, space saving and low cost are all required. In a battery charger rated 5V/1A, the maximum standby power is only 0.18Watt. In normal operation, the AP3700 switches on and off at a fixed switching frequency of 60 kHz. With a current limit capability of 420mA, the AP3700 can directly drive the emitter of high voltage NPN transistor or the source of MOSFET. When output power falls below a given level, the IC enters skip cycle mode to reduce power consumption. The AP3700 also features under-voltage lockout, overcurrent and short circuit protections. The AP3700 is available in TO-92 package.
Features
* * * * * * * * * Current Mode Control with Skip Cycle Capability Lower Operating Current: 0.45mA Fixed Switching Frequency: 60 kHz Frequency Dither for Low EMI: 2.5kHz Under-Voltage Lockout Protection Over-Current Protection Internal Short Circuit Protection Higher Output Breakdown Voltage Lower Total Cost Solution
Applications
* * Battery Chargers Off-Line Power Supplies
TO-92
Figure 1. Package Types of AP3700
Jan. 2007 Rev. 1. 1 1
BCD Semiconductor Manufacturing Limited
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER AP3700
Pin Configuration
Z Package (TO-92)
3 2 1
OUT GND VCC
Figure 2. Pin Configuration of AP3700 (Top View)
Pin Description
Pin Number TO-92 1 2 3 Pin Name VCC GND OUT Function The power supply of the IC, and is generally connected to opto-coupler's emitter Supply ground The output pin, connected to the emitter of NPN transistor or the source of MOSFET
Jan. 2007 Rev. 1. 1 2
BCD Semiconductor Manufacturing Limited
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER AP3700
Functional Block Diagram
VCC
1
UVLO COMPARATOR VREF
REGULATOR
3
SHORT CIRCUIT COMPARATOR
OUT
_ +
SLOPE RAMP OSCILLATOR
_ +
VREF
CLAMP COMPARATOR
+ _
+ +
BANDGAP & VREF BIAS
PWM COMPARATOR PWM CONTROL
DRIVER
_
GND
2
Figure 3. Functional Block Diagram of AP3700
Jan. 2007 Rev. 1. 1 3
BCD Semiconductor Manufacturing Limited
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER AP3700
Ordering Information
AP3700 Circuit Type E1: Lead Free TR: Ammo for TO-92 Blank: Bulk
Package Z: TO-92
Package TO-92
Switching Frequency 60kHz
Temperature Range -40 to 85oC
Part Number AP3700Z-E1 AP3700ZTR-E1
Marking ID 3700Z-E1 3700Z-E1
Packing Type Bulk Ammo
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant.
Absolute Maximum Ratings (Note 1)
Parameter Supply Voltage Voltage at OUT Output Current at OUT Power Dissipation Operating Junction Temperature Storage Temperature Lead Temperature (Soldering, 10s) ESD (Machine Model) Value -0.3 to 6.0 -0.3 to 40 Internally limited N/A 150 -65 to 150 300 200 Unit V V A W
o
C
oC oC
V
Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability.
Jan. 2007 Rev. 1. 1 4
BCD Semiconductor Manufacturing Limited
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER AP3700
Electrical Characteristics
(VCC=4V, TJ=25oC, unless otherwise specified.)
Parameter UVLO SECTION Start-up Voltage Minimal Operating Voltage VTH (ST) VOPR(Min) IST ICC(OPR) VZ RVCC FSW ICC=10mA VCC=3.8 to 4.8V 50 6 VCC=4V 5.00 3.4 5.25 3.65 5.50 3.9 V V Symbol Conditions Min Typ Max Unit
STANDBY CURRENT SECTION Start-up Current Operating Current VCC Zener Voltage Dynamic Impedance INTERNAL OSCILLATOR Switching Frequency Frequency Dither Temperature Stability DRIVE OUTPUT SECTION OUT Start-up Voltage Short Circuit Threashold Voltage Rise Time Fall Time Maximum Duty Cycle Minimum Duty Cycle Driver OUT On-Resistance Switch Off Current (OUT) Effective Current Limit OUT Current Coefficient ILIM GA ROUT VST VSC TR TF DMAX CL=1nF, 15 pull-up CL=1nF, 15 pull-up VOPR(Min) + 0.2V VCC=VTH (ST)-0.2V IOUT=0.06A Driver off, VOUT=10V VCC = VOPR+0.1V 420 -0.3 67 8.5 6 60 30 75 3 3 20 40 A mA A/V 84 % 11 V V ns 60 75 kHz kHz % 0.22 0.45 6.3 18 0.4 0.7 V k mA
2
2.5
5
3
8
Jan. 2007 Rev. 1. 1 5
BCD Semiconductor Manufacturing Limited
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER AP3700
Typical Performance Characteristics
500
300
280
Operating Current (A)
450
Start-up Current (A)
260
240
400
220
350 -40 -25 -10
5
20
35
50
65
o
80
95 110 125
200 -40 -25 -10
5
20
35
50
65
o
80
95 110 125
Ambient Temperature ( C)
Ambient Temperature ( C)
Figure 4. Operating Current vs. Ambient Temperature
Figure 5. Start-up Current vs. Ambient Temperature
65
500
Switching Frequency (KHz)
60
Start-up Current (A)
High Side frequency for dither
400
300
200
55
Low Side frequency for dither
100
50 -40 -25 -10
5
20
35
50
65
o
80
95 110 125
0
1
2
3 VCC Voltage (V)
4
5
Ambient Temperature ( C)
Figure 6. Switching Frequency vs. Ambient Temperature
Figure 7. Start-up Current vs. VCC Voltage
Jan. 2007 Rev. 1. 1 6
BCD Semiconductor Manufacturing Limited
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER AP3700
Function Description
1. Startup Circuit Figure 3 is the functional block diagram of AP3700, and there are 3 external pins: the VCC pin, the OUT pin and GND pin. In typical application shown by Figure 10, the VCC pin is used for both bias supply and feedback control. The OUT pin directly drives external NPN transistor or MOSFET, and also provides initial bias power for UVLO comparator. When the IC works in PWM mode, the auxiliary winding will supply the VCC enough operating current. Figure 8 shows the start-up sequence of the VCC and the VOUT.
Figure 9. Frequency Dither Influences the Swithcing Cycle
CH1: VCC
AP3700 has reference switching frequency of 60 kHz, and its frequency deviation is 2.5kHz in period of 2ms. Figure 9 shows the frequency dither influence to the waveform . 4. Current Limit Control The AP3700 employs current mode control to improve transient response and voltage stability. In Figure 10, the external inductor current through the OUT pin is converted to a voltage by an internal resistor, and this voltage will participate to control duty cycle and peak inductor current.
CH2: OUT
Figure 8. Start-up Sequence of VCC and VOUT
2. VCC/Feedback Control An opto-coupler and secondary constant voltage/ current controller consists of voltage feedback network. When load is heavy, the voltage on VCC will be lower to enlarge duty cycle; on the contrary, if load drops, the voltage on VCC will rise to reduce duty cycle. 3. Frequency Dither Frequency dither is performed by periodically spreading a single switching frequency into adjacent frequency band, so the peak energy is spread. This technique can improve EMI by reducing both quasipeak and average EMI emissions.
Jan. 2007 Rev. 1. 1 7
BCD Semiconductor Manufacturing Limited
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER AP3700
Typical Application
R1 10/1W
Bridge D1-D4 1N4007*4
L1 330 C2 4.7 +
R2 R4 1.5M 100k
T1 EE16
D9 SB240
C9 470 +
L2 5.5
C11 470 +
5V/1A VO+
J1 AC 85-264V
+ C1 4.7
C3 2200p
Rs 0.2
R13 6.2k VO-
D5 FR107
D7 1N4148 R5 4.7 D8 1N4148
C10 47 +
R15 2k
Q1 APT13003
D6 1N4148
R9 100k
C8 0.1
U3 PC817
R8 200 C7 2.2n
R6 390 + C4 10
3
OUT VCC GND
2 1
R7 510 + C5 10 C6 3.3n R12 100
3
Vcc VOUT
R10 22k 1
VCTRL
6
VCC ICTRL
VSENSE GND
5 R11 510
4
2
U1 AP3700
U2 AP4313
Figure 10. 5V/1A Output for Battery Charger of Mobile Phone
Jan. 2007 Rev. 1. 1 8
BCD Semiconductor Manufacturing Limited
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE BATTERY CHARGER AP3700
Mechanical Dimensions TO-92 Unit: mm(inch)
1.100(0.043) 1.400(0.055) 3.430(0.135) MIN 0.360(0.014) 0.510(0.020)
3.300(0.130)
3.700(0.146)
0.000(0.000) 0.380(0.015) 1.600(0.063) MAX 4.400(0.173) 4.700(0.185)
4.300(0.169)
4.700(0.185)
0.380(0.015) 0.550(0.022)
1.270(0.050) TYP
2.440(0.096) 2.640(0.104)
Jan. 2007 Rev. 1. 1 9
14.100(0.555) 14.500(0.571)
BCD Semiconductor Manufacturing Limited
http://www.bcdsemi.com
IMPORTANT NOTICE BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifications herein. BCD Semiconductor Manufacturing Limited does not assume any responsibility for use of any its products for any particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or other rights nor the rights of others.
MAIN SITE BCD Semiconductor Manufacturing Limited
- Wafer Fab Shanghai SIM-BCD Semiconductor Manufacturing Limited 800, Yi Shan Road, Shanghai 200233, China Tel: +86-21-6485 1491, Fax: +86-21-5450 0008
BCD Semiconductor Manufacturing Limited
- IC Design Group Advanced Analog Circuits (Shanghai) Corporation 8F, Zone B, 900, Yi Shan Road, Shanghai 200233, China Tel: +86-21-6495 9539, Fax: +86-21-6485 9673
REGIONAL SALES OFFICE
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