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Preliminary Datasheet
ADJUSTABLE-SPEED SINGLE-PHASE FULL-WAVE PRE-DRIVER FOR MOTOR AM4967
General Description
The AM4967 is a single-coil, single-phase motor predriver designed by bipolar process. Its rotation speed can be controlled through an external PWM. This IC requires few external components and has the merit of high efficiency which make it suitable for use in great air volume, large current and high voltage applications. The AM4967 is available in SSOP-16 package.
Features
* * * * * * * * Single-phase Full-wave Pre-drive Rotation Speed Control via External PWM Maximum Operating Current Limit Linear Start Function for Reducing Large Current Impulse at the Moment of Turn-on Minimum Rotation Speed Setting Lock Protection and Auto Start Function Rotation Speed Indication Over Temperature Protection
Application
* * CPU and OA (Office Automation) Cooler Fan Brushless DC Motor
SSOP-16
Figure 1. Package Type of AM4967
Jun. 2008 Rev. 1. 1 1
BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
ADJUSTABLE-SPEED SINGLE-PHASE FULL-WAVE PRE-DRIVER FOR MOTOR AM4967
Pin Configuration
GS Package (SSOP-16)
OUT2 OUT2B VCC CS VMIN VPWM COSC FG/RD
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
OUT1 OUT1B GND VREF LS CT HIN+ HIN-
Figure 2. Pin Configuration of AM4967
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BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
ADJUSTABLE-SPEED SINGLE-PHASE FULL-WAVE PRE-DRIVER FOR MOTOR AM4967
Pin Description
Pin Number 1 2 3 Pin Name OUT2 OUT2B VCC Function Second channel P-type driver output. Open-drain output, must be connected with pull-up resistor to drive external power devices in operation Second channel N-type driver output. Push-pull output to drive external power devices Power supply Current limiter indicator. Fixed to 0.2V internally. Maximum allowable current is decided by external sample resistance. When the voltage of this pin exceeds 0.2V, the output will be shut down by current limit. If this function is not used, connect this pin to ground directly Minimum speed setting terminal. Connect it to VREF when disused. In case it is tied to other power supply for controlling, an isolated resistor is necessary Speed control terminal. It is full speed mode when connected to ground. If the speed is controlled by PWM mode, the frequency of control signal is 20kHz to 100kHz. Moreover, a low pass network is necessary to transfer PWM to DC level PWM basic oscillation frequency generator when connected with a capacitor of 220pF. 30kHz frequency is available. "FG" means pin 8 is an output pin of FG signal which is used for detecting rotation speed. "RD" means pin 8 is an output pin of RD signal, and is used for detecting fan rotate-stop state. "FG" and "RD" can be selected according to the requirement. This pin need to be connected with pull-up resistor when used. A new pulse will be generated once input signal changed. Keep this pin open when it is not to be used Hall sensor negative input. To prevent noise, this pin is recommended to be placed as close as possible to Hall circuit. If necessary, a capacitor may be added between HIN+ and HIN- to reduce the influence caused by noise Hall sensor positive input. To avoid noise, this pin is recommended to be placed as close as possible to Hall circuit Lock protection and auto start frequency generator. It is connected with an external 0.47F capacitor which decides lock-rotate time and start time. If lock-rotate protection function is disused, please connect this pin to GND Linear start terminal. This pin is connected to VREF externally via a capacitor of 0.47F to 1F which enables fan start steadily. Start time is dependent to the capacitance. If linear start function is not used, connect this pin to ground 5V voltage reference Ground for circuit control First channel N-type driver output. Push-pull output to drive external power devices First channel P-type driver output. Open-drain output, must be connected with pull-up resistor to drive external power devices in operation
4
CS
5
VMIN
6
VPWM
7
COSC
8
FG/RD
9
HIN-
10
HIN+
11
CT
12 13 14 15 16
LS VREF GND OUT1B OUT1
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BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
ADJUSTABLE-SPEED SINGLE-PHASE FULL-WAVE PRE-DRIVER FOR MOTOR AM4967
Functional Block Diagram
8
CT
11
Lock Shutdown and Auto Restart
FG/RD
Thermal Shutdown
VCC
3
VREF
13
5V Reference
15 16
OUT1B OUT1 OUT2B OUT2
Controller HIN+ HIN10 9
Predriver
2 1
Hysteresis Amp
Hysteresis Amp Oscillation
12 5 6 7 4 14
LS VMIN VPWM
COSC
CS
GND
Figure 3. Functional Block Diagram of AM4967
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BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
ADJUSTABLE-SPEED SINGLE-PHASE FULL-WAVE PRE-DRIVER FOR MOTOR AM4967
Truth Table 1. Driver-lock. VOSC is High, VPWM, VVMIN and VLS are low.
HINH L H L HIN+ L L H L H H OFF OFF OFF H L H L OFF OFF L H L OFF L OFF Lock Protection OUT2 OUT1 (Driver) CT OUT1 L OUT1B L OUT2 OFF OUT2B H FG/RD L OUT1 Mode OUT2 (Driver)
2. Speed control. VCT, VLS are low.
VPWM, VMIN L COSC H HINH L H H L L HIN+ L H L H OUT1 L OFF OFF OFF OUT1B L H L H OUT2 OFF L OFF OFF OUT2B H L H L Regenerative OUT1 OUT2 Mode OUT2 (Driver) OUT1 (Driver)
Ordering Information
AM4967 Circuit Type Pin 8 R: RD Blank: FG Package GS: SSOP-16
Temperature Range Part Number Lead Free AM4967GS-E1 AM4967GSTR-E1 SSOP-16 -30 to 105oC AM4967RGS-E1 AM4967RGS-G1 AM4967RGS AM4967RGS-G1 Tube Tape & Reel AM4967RGSTR-E1 AM4967RGSTR-G1 AM4967RGS AM4967RGS-G1 Green AM4967GS-G1 AM4967GSTR-G1 Marking ID Lead Free AM4967GS AM4967GS Green AM4967GS-G1 AM4967GS-G1 Packing Type Tube Tape & Reel
E1: Lead Free G1: Green TR: Tape and Reel Blank: Tube
Package
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant. Products with "G1" suffix are available in green package.
Jun. 2008 Rev. 1. 1 5
BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
ADJUSTABLE-SPEED SINGLE-PHASE FULL-WAVE PRE-DRIVER FOR MOTOR AM4967
Absolute Maximum Ratings (Note 1)
Parameter Supply Voltage OUT1B/OUT2B Output Current OUT1/OUT2 Sink Current OUT1B/OUT2B/OUT1/OUT2 Withstand Voltage VPWM/VMIN Withstand Voltage LS Withstand Voltage FG/RD Withstand Voltage FG/RD Output Current VREF Output Current Power Dissipation (Note 2) Storage Temperature Range ESD (Human Body Model) Symbol VCC IOUTB IOUT VOUT VPWM/VVMIN VLS VFG/VRD IFG/IRD IREF PD TSTG ESD Value 18 20 20 18 7 7 VCC 10 20 800 -55 to 150 2000 Unit V mA mA V V V V mA mA mW
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. Note 2: When mounted on the specified printed circuit board (114.3mmx76.1mmx1.6mm, glass epoxy).
Recommended Operating Conditions
Parameter Supply Voltage VPWM/VMIN Input Voltage Hall Input Voltage Ambient Temperature TA Symbol VCC Min 5.5 0 0.2 -30 Typ Max 16 5 3 105 Unit V V V
o
C
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BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
ADJUSTABLE-SPEED SINGLE-PHASE FULL-WAVE PRE-DRIVER FOR MOTOR AM4967
Electrical Characteristics
(VCC=12V, TA=25oC, unless otherwise specified.)
Parameter Quiescent Current IQ2 VREF Reference Voltage Current Limit Voltage COSC High Level Voltage COSC Low Level Voltage COSC Frequency CT High Level Voltage CT Low Level Voltage CT Charge Current CT Discharge Current CT Charge and Discharge Ratio Linear Start Charge Current OUT1B/OUT2B High Level Voltage OUT1B/OUT2B Low Level Voltage OUT1/OUT2 Low Level Voltage FG Signal Hall Input Sensitivity FG Saturation Voltage FG Leakage Current VPWM/VMIN Bias Current VREF VLIM VOSCH VOSCL fOSC VCTH VCTL ICHG IDHG RCD ILS VOBH VOBL VOL VHN VSAT ILFG IPWMB/IVMINB VCT=0.5V VCT=3.5V ICHG/IDHG VLS=1V IOUT=10mA IOUT=10mA IOUT=10mA IHIN+, IHIN- difference voltage (include offset and hysteresis) ISINK=5mA VFG=VCC VOSC=VPWM/VVMIN=2V 0.1 VCC1.8 CL=220pF Lock on IOUT=5mA 8 4.5 186 3.0 0.9 25.4 2.4 1.0 1.5 0.13 8.5 10 5.0 200 3.4 1.1 30 3.3 1.3 2 0.2 10 0.5 VCC0.9 0.9 0.45 10 200 500 30 3 12 5.5 215 3.8 1.3 35.5 3.6 1.6 2.5 0.25 14.5 0.7 VCC 1.5 0.8 A V V V mV mV A A V mV V V kHz V V A A Symbol IQ1 Lock off Conditions Min 8 Typ 10 Max 12 mA Unit
Jun. 2008 Rev. 1. 1 7
BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
ADJUSTABLE-SPEED SINGLE-PHASE FULL-WAVE PRE-DRIVER FOR MOTOR AM4967
Typical Performance Characteristics
16
16 14
14
12
Supply Current (mA)
12
Supply Current (mA)
TA=25C
10 8 6 4 2 0 -40
10
8
6
4 2 4 6 8 10 12 14 16 18
VCC=12V
-30 -20 -10 0 10 20 30 40
O
50
60
70
80
Supply Voltage (V)
Ambient Temperature ( C)
Figure 4. Supply Current vs. Supply Voltage
Figure 5. Supply Current vs. Ambient Temperature
6.0
7.5 7.0
5.5
6.5
Reference Voltage (V)
Reference Voltage (V)
6.0 5.5 5.0 4.5 4.0 3.5 3.0
5.0
4.5
4.0
VCC=12V IOUT=5mA
VCC=12V TA=25 C
O
3.5 -40 -30 -20 -10
2.5
0
10
20
30
40
50
O
60
70
80
90
0
2
4
6
8
10
12
14
16
18
20
Ambient Temperature ( C)
Output Current (mA)
Figure 6. Reference Voltage vs. Ambient Temperature
Figure 7. Reference Voltage vs. Output Current
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BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
ADJUSTABLE-SPEED SINGLE-PHASE FULL-WAVE PRE-DRIVER FOR MOTOR AM4967
Typical Performance Characteristics (Continued)
1000
800
Power Dissipation (mW)
600
400
200
0 -20 0 20 40 60 80 100
Ambient Temperature (C)
Figure 8. Power Dissipation vs. Ambient Temperature
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BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
ADJUSTABLE-SPEED SINGLE-PHASE FULL-WAVE PRE-DRIVER FOR MOTOR AM4967
Operating Diagram
VPWM Voltage
fOSC=30kHz (COSC=220pF) VMIN Voltage
ON-Duty-Large
3.0V
COSC Voltage ON-Duty-Small
0V 1.0V
Minimum Speed Setup Rotation (Stop Mode)
Low Speed
PWM Adjustable Speed
High Speed
Full Speed
FG
RPM
Figure 9. Operating Diagram 1 of AM4967 (Speed Control, Note 3)
Note 3: 1. Minimum Speed Setting Mode (Stop Mode) When fan rotate at low speed, its lowest speed is settable by VMIN pin voltage. If not, fan motor stops. 2. Low Speed to High Speed Setting Mode PWM control system works by comparing the voltage of VPWM and COSC (1.0V to 3.0V). When VPWM voltage is low, the transistors of the upper and lower side outputs are ON. On contrary, when VPWM voltage is high, the upper side transistors are OFF. And coil current re-circulates in a lower side transistor. Therefore, as the VPWM
voltage becomes lower, output ON duty becomes large. Sequentially, coil current increases and the motor runs at high speed which is monitored by FG output while rotation-stop state is monitored by RD output. 3. Full Speed Rotation Mode When VPWM voltage drops to 1.0V or lower, motor fan will run at full speed. (If the speed is not controlled, VPWM=GND)
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BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
ADJUSTABLE-SPEED SINGLE-PHASE FULL-WAVE PRE-DRIVER FOR MOTOR AM4967
Operating Diagram (Continued)
LS Voltage 3.0V VMIN Voltage
COSC
VPWM Voltage 1.0V
0V
Lock Protection
Linear Start
VPWM Setting Speed
100%
ON-Duty
0%
Figure 10. Operating Diagram 2 of AM4967 (Linear Start, VPWM VoltageLS Voltage VPWM Voltage 3.0V VMIN Voltage
COSC
1.0V
0V
Lock Protection
Linear Start
VMIN Setting Speed
100%
ON-Duty
0%
Figure 11. Operating Diagram 3 of AM4967 (Linear Start, VPWM Voltage>VMIN Voltage, Note 4)
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BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
ADJUSTABLE-SPEED SINGLE-PHASE FULL-WAVE PRE-DRIVER FOR MOTOR AM4967
Operating Diagram (Continued)
LS Voltage VPWM Voltage 3.0V VMIN Voltage
COSC
1.0V
0V
Lock Protection
Linear Start
VMIN Setting Speed
RD
High Level Low Level
100%
ON-Duty
0%
Figure 12. Operating Diagram 4 of AM4967 (Note 4)
Note 4: The inclination of LS voltage is adjusted between VLS and VREF according to the capacitance which is recommended to be 0.1F to 1.0F.
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BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
ADJUSTABLE-SPEED SINGLE-PHASE FULL-WAVE PRE-DRIVER FOR MOTOR AM4967
Typical Application
Power In
More than 1F/25V
1k
OUT1
OUT2
100
More than 1F/25V
3 VCC 13 VREF
10k~ 100k
FG/RD
8
Hall
9 10 12 5
AM4967
HINCS HIN+ OUT1 LS OUT1B VMIN OUT2 OUT2B 16 15 1 2 14 4
6 PWM In
VPWM COSC 7
GND CT 11
220pF (f =30kHz)
0.47F
Figure 13. Typical Application of AM4967 (VCC=12V)
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BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
ADJUSTABLE-SPEED SINGLE-PHASE FULL-WAVE PRE-DRIVER FOR MOTOR AM4967
Mechanical Dimensions SSOP-16 Unit: mm(inch)
3.800(0.150) 4.000(0.157) 0.200(0.008) 0.300(0.012) 0.635(0.025) BSC 4.700(0.185) 7 7
o
o
0.800(0.031)
5.100(0.201)
0.100(0.004) 1.000(0.039) 0.900(0.035) 0.250(0.010) 1.350(0.053) 1.750(0.069)
0.400(0.016) 5.800(0.228) 6.200(0.244) 8 SEE DETAIL A 0.150(0.006) 0.250(0.010) 1.350(0.053) 1.550(0.061) 0 R0.150(0.006) 8 1.270(0.050) 0.250(0.010)
o
o o
R0.150(0.006) 8
o
0.200(0.008) 0.250(0.010)
0.650(0.026) 0.750(0.030)
0.020(0.001) 0.050(0.002) DETAIL A
Jun. 2008 Rev. 1. 1 14
BCD Semiconductor Manufacturing Limited
BCD Semiconductor Manufacturing Limited
http://www.bcdsemi.com
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