Document
FA7615CP(E)
s Description
The FA7615CP(E) is a bipolar IC containing basic circuit necessary for PWM-type switching power supply control. This IC can be operated by external synchronizing pulses.
Bipolar IC For Switching Power Supply Control FA7615CP(E)
s Dimensions, mm SSOP-16
16 9
s Features
• • • • External synchronization input terminal Low-voltage operation (VCC = 3.6 to 22V) Totem-pole predriver Latch-mode short-circuit protection function (no malfunction due to electrical noise) • One capacitor shared for short-circuit protection and for softstart to minimize the number of external discrete components
5.3 7.9±0.3
1
0.1±0.1
6.2
+0.1
8
0.2 –0.05
s Applications
• Battery power supply for portable equipment
0.3
0.65
0~10˚
0.6
DIP-16
16 9
1 0.81
19.4 1.5
8 3.1min 4.3max
0.2min
3.4
6.5
0.3 –0
7.6
0~1 5˚
+0.1 5 .0
2.54±0.25
0.5±0.1
0~15 ˚
s Block diagram
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Pin symbol
Description Oscillator timing capacitor Capacitor for soft-start, short-circuit protection and delay Dead time adjustment Non-inverting input to error amplifier Inverting input to error amplifier Error amplifier output Ground CH. 2 Output Power supply CH. 1 Current limiting resistor CH. 1 Output Error amplifier output Inverting input to error amplifier Dead time adjustment External synchronization input Reference voltage output (2.5V)
CT CS DT2 IN2 (+) IN2 (–) FB2 GND OUT2 VCC OUT1R OUT1 FB1 IN1 (–) DT1
SYNC
REF
2.1max
1
FA7615CP(E)
s Absolute maximum ratings
Item Supply voltage Symbol Rating 22 5 ±50 400 –20 to +85 –40 to +150 Unit V mA mA mW °C °C
s Recommended operating conditions
Item Supply voltage Feedback resistance Oscillator timing capacitor Oscillator timing resistance Oscillation frequency Symbol Min. 3.6 100 220 10 5 22,000 100 200 Max. 20 Unit V kΩ pF kΩ kHz
VCC Reference voltage output current IOR Output current IO Total power dissipation Pd
Operating temperature Storage temperature
VCC RNF CT RT fOSC
Topr Tstg
s Electrical characteristics (Ta = 25°C, VCC = 6V, RT = 47kΩ, CT = 1000pF) Reference voltage section
Item Output voltage Line regulation Load regulation Output voltage variation due to temperature change Symbol Test condition Min. Typ. 2.432 4 1 Max. 2.481 12 6 1 1 Unit V mV mV % %
VREF LINE LOAD VTC1 VTC2
IOR = 1mA 2.383 VCC = 3.6 to 20V, IOR = 1mA IOR = 0.1 to 1mA
Ta = –20 to +25° C Ta = +25 to +85 °C –1 –1
Oscillator section
Item Oscillation frequency Frequency variation 1 (due to supply voltage change) Frequency variation 2 (due to temperature change) Synchronizing terminal input current Synchronizing terminal input voltage Symbol Test condition Min. 17 Typ. 20 1 5 0.4 1 1.0 2.5 Max. 23 Unit kHz % % mA V
fOSC fdV fdT ISYNC VSYNC
CT = 1000pF, RT = 47kΩ VCC = 3.6 to 20V
Ta = –20 to +85° C
VSYNC = 2V
Error amplifier section
Item Reference voltage Input bias current Open-loop voltage gain Unity-gain bandwidth Maximum output voltage (Pin 6 and Pin 12) Output source current (Pi.