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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 7.90.3
1
0.10.1
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
2.540.25
0.50.1
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 k pF k 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 = 25C, VCC = 6V, RT = 47k, 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 +25C Ta = +25 to +85C -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 = 47k VCC = 3.6 to 20V
Ta = -20 to +85C
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 (Pin 6 and Pin 12) Symbol Test condition Min. 0.484 70 1.0 RNF = 100k Typ. 0.494 5 Max. 0.504 100 Unit V nA dB MHz V 200 40 85 200 mV
VB IB AV GB VOM+ VOM- IOM+ RNF = 100k VOM = 1V
VREF-0.2
A
PWM comparator section
Item Input threshold voltage (Pin 6 and Pin 12) Input threshold voltage (Pin 6 and Pin 12) Symbol Test condition Duty cycle = 0% Duty cycle = 50% Min. Typ. 0.38 0.6 Max. 0.48 Unit V V
VTH0 VTH50
2
FA7615CP(E)
Dead time adjustment circuit section
Item Input bias current (Pin 3 and Pin 14) Input threshold voltage (Pin 3 and Pin 14) Input threshold voltage (Pin 3 and Pin 14) Symbol Test condition Duty cycle = 0% Duty cycle = 50% Min. Typ. 80 0.38 0.60 Max. 300 0.48 Unit nA V V
IBDT VTH DT0 VTH DT50
Short-circuit protection circuit section
Item Input threshold voltage (Pin 6 and Pin 12) Charge current (Pin 2) Latch-mode threshold voltage (Pin 2) Symbol Test condition Min. 1.60 Pin 2 = 0V, Pin 6, Pin 12 = 2V 18 1.60 Typ. 1.80 30 1.80 Max. 2.00 42 2.00 Unit V
VTH PC ICHG VTH LA
A
V
Undervoltage lockout section
Item OFF-to-ON threshold voltage ON-to-OFF threshold voltage Voltage hysteresis Symbol Test condition Min. Typ. 2.65 2.60 50 Max. Unit V V mV
VTH ON VTH OFF VHYS
Output section
Item Output saturation voltage H-level (CH.1) Symbol Test condition Output source current = 20mA Output sink current = 20mA Pin 11 = 0V 6 19 Min. Typ. 0.3 0.3 11 27 Max. 0.8 0.8 15 36 Unit V V mA mA
VO1H ISOURCE1 ISOURCE2
L-level (Common to CH.1 and CH.2) VO1L/2L CH. 1 Output source current (Pin 11) CH. 2 Output source current (Pin 8)
VCC = 16V, Pin 8 = 0V
Overall device
Item Supply current Operating-state supply current Symbol Test condition Latch mode Min. Typ. 2.0 3.5 Max. 3.0 6.0 Unit mA mA
ICC LA ICC AV
RL = Duty cycle = 50%
3
FA7615CP(E)
s Characteristic curves (Ta = 25C)
Oscillation frequency (fOSC) vs. timing resistor resistance (RT) Output duty cycle vs. CS terminal voltage (VCS)
Output duty cycle vs. DT terminal voltage (VDT)
Output duty cycle vs. FB terminal voltage (VFB)
H-level output saturation voltage (VO1H) vs. CH. 1 output source current (ISOURCE1)
CH-2 output source current (ISOURCE2) vs. supply voltage (VCC)
VO1H [V]
ISOURCE [mA]
4
FA7615CP(E)
L-level output voltage (VOL) vs. output sink current (ISINK) Supply current (ICC) vs. supply voltage (VCC)
Error amplifier frequency (f) vs. voltage gain (AV)/phase ()
f [Hz]
Phase [deg]
AV[dB]
5
FA7615CP(E)
s Application circuit Flyback-transformer type and chopper type boost converter 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. Please connect a capacitor, which the value is about 0.01F to 0.1F, between VCC and REF terminals in order to prevent from irregular output pulse at start-up.
6

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