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FA7630CP(E)
FA7630CP(E)
Bipolar IC
For Switching Power Supply Control
■ Description
The FA7630CP(E) is dual channel PWM-type switching power
supply control IC.
This IC can drive Pch-MOSFET directly and is optimum for
large power DC-DC converter.
This IC has all the necessary protection functions for a power
MOSFET. It is optimum for a portable equipment power
supply which uses low-voltage input to output comparably
large power.
■ Features
• Dual channel PWM-type switching power supply control
• ±2.6% (V
• Low voltage operation (Vcc: 5 to 20V)
• Drive circuit for connecting a Pch-MOSFET
• Overload cutoff circuit with timer latch circuit
• Soft start circuit
• Undervoltage lockout function (UVLO)
• Pulse-by-pulse overcurrent limiting function
• Output ON/OFF control function for each channel
• Master-slave synchronized operation without external
components
• Maximum operating frequency is 500kHz
REF) and ±3% (VB) reference voltage
■ Dimensions, mm
Á SSOP-20
20
0.3
1
7.2
11
10
0.65
Á DIP-20
20
±0.1
5.3
0.1
±0.3
7.9
.05
.1
0
+
–0
0.2
0~10˚
11
0.6
2.1max
6.4
■ Block diagram
1
2.54
0.77
±0.25
1.52
10
0.46
±0.1
3.6
0.51min
5.1max
2.54min
0~15˚
7.62
0~15˚
24.4
Pin Pin Description
No. symbol
1 CT Oscillator timing capacitor
2 RT Oscillator timing resistor
3 ON/OFF2 Output ON/OFF control 2
4 IN2+ Non-inverting input to error
amplifier
5 IN2– Inverting input to error amplifier
6 FB2 Error amplifier output
7 DT2 Dead time adjustment
8 OCL2 Overcurrent limiting circuit 2
9 GND Ground
10 OUT2 CH.2 output
11 OUT1 CH.1 output
12 VCC Power supply
13 OCL1 Overcurrent limiting circuit
14 DT1 Dead time adjustment
15 FB1 Error amplifier output
16 IN1+ Non-inverting input to error
amplifier
17 ON/OFF1 Output ON/OFF control 1
18 SYNC IN Synchronizing signal input
19 CP Timer and latch circuit
20 REF Reference voltage output
0.25
+0.1
–0.05
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FA7630CP(E)
■ Absolute maximum ratings
Item Symbol Rating Unit
Maximum supply voltage VCC 22 V
Maximum output current IOUT ±500 mA
Maximum power dissipation Pd 650 mW
Junction temperature TJ 125 °C
Operating temperature Topr –20 to +85 °C
Storage temperature Tstg –40 to +150 °C
■ Recommended operating conditions
Item Symbol Min. Max. Unit
Supply voltage VCC 520V
Feedback resistance RNF 100 kΩ
Oscillator timing capacitance CT 50 2200 pF
Oscillator timing resistance RT 24 100 kΩ
Oscillation frequency fOSC 50 500 kHz
■ Electrical characteristics (Ta=25°C, VCC=6V, CT=180pF, RT=47kΩ)
Reference voltage section
Item Symbol Test condition Min. Typ. Max. Unit
Output voltage VREF IOR = 1mA 2.450 2.520 2.580 V
Line regulation LINE VCC = 5.0 to 20V 5 20 mV
IOR=1mA
Load regulation LOAD IOR = 0.1 to 1mA 30 50 mV
Output voltage variation due to temperature change VTC1 Ta = –20 to +25°C–1 1%
VTC2 Ta = +25 to +85°C–1 1%
Oscillation and synchronizing circuit section
Item Symbol Test condition Min. Typ. Max. Unit
Oscillation frequency fOSC CT=180pF, RT=47kΩ 74 83 92 kHz
Frequency variation(due to supply voltage change) fdV VCC = 3.6 to 20V 1 %
Frequency variation(due to temperature change) fdT Ta = –20 to +85°C5%
H level of synchronizing signal VSYH 1.5 1.8 V
L level of synchronizing signal VSYL 0.8 1.1 V
Cutoff level of synchronizing signal VSD 0.4 V
Bias current of synchronizing signal ISYNC VSYNC=1.6V 5 µA
Error amplifier section (Ch.1)
Item Symbol Test condition Min. Typ. Max. Unit
Reference voltage VB 0.769 0.793 0.817 V
Input bias current IB 5 100 nA
Open-loop voltage gain AVO 60 dB
Unity-gain bandwidth fT 1 MHz
H state output voltage VOH No load 2.10 V
L state output voltage VOL No load 300 mV
Output source current IOH VOH=1V 40 55 100 µA
Error amplifier section (Ch.2)
Item Symbol Test condition Min. Typ. Max. Unit
Input offset voltage VIO 210mV
Input bias current IB 5 100 nA
Common-mode input voltage VCOM 0 1.0 V
Open-loop voltage gain AVO 70 dB
Unity-gain bandwidth fT 1.0 MHz
H state output voltage VOH No load 2.10 V
L state output voltage VOL No load 300 mV
Output source current IOH VOH=1V 50 65 200 µA
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FA7630CP(E)
Pulse width modulation circuit section (FB pin)
Item Symbol Test condition Min. Typ. Max. Unit
Input threshold voltage VTHO Duty cycle = 0% 1.65 V
Input threshold voltage VTH1 Duty cycle = 100% 0.95 V
Dead time adjustment circuit section (DT pin)
Item Symbol Test condition Min. Typ. Max. Unit
Input threshold voltage VTHO Duty cycle = 0% 1.65 V
Input threshold voltage VTH1 Duty cycle = 100% 0.95 V
Standby voltage VSTB DT pin open 1.80 V
Overcurrent limiting circuit section
Item Symbol Test condition Min. Typ. Max. Unit
Input threshold voltage VTHOC 175 200 225 mV
Hysteresis voltage VHYOC 40 mV
Input bias current IOC 45 80 µA
Delay in OCL tdoc Overdriving : 50mV 120 ns
Timer and latch circuit section
Item Symbol Test condition Min. Typ. Max. Unit
Latch-mode threshold voltage VTHCP 1.00 1.25 1.50 V
Input bias current IINCP VCP=1.5V, VFB=0.3V 1 µA
CP pin voltage / LOW VSATC ICP=20µA, VFB=1.0V 300 mV
Output ON/OFF control section
Item Symbol Test condition Min. Typ. Max. Unit
OFF-to-ON threshold voltage VTHON 3.0 V
ON-to-OFF threshold voltage VTHOF 0.60 V
Input bias current IIN VIN=3V 230 350 µA
Undervoltage lock-out circuit section
Item Symbol Test condition Min. Typ. Max. Unit
OFF-to-ON threshold voltage VCCON 3.92 4.20 4.48 V
ON-to-OFF threshold voltage VCCOF 3.50 V
Voltage hysteresis VHYS 0.70 V
Output section
Item Symbol Test condition Min. Typ. Max. Unit
Saturation voltage(H level) VSAT+ IO= –50mA 1.60 2.00 V
Saturation voltage(L level) VSAT– IO= 50mA 1.40 1.80 V
Overall device
Item Symbol Test condition Min. Typ. Max. Unit
Standby supply current ICCST Out pin open 0.1 10 µA
Operating-state supply current ICC1 Single channel operation 2.20 3.20 mA
Duty cycle =50%
ICC2 Dual channel operation 3.00 4.20 mA
Duty cycle =50%
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■ Application circuit
Á Individual application circuit
FA7630CP(E)
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FA7630CP(E)
Á Master-slave application circuit
Parts tolerances characteristics are not defined in the circuit design
sample shown above. When designing an actual circuit for a product,
you must determine parts tolerances and characteristics for safe and
economical operation.
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