Document
FA531X series series FA531X
Bipolar IC For Switching Power Supply Control
s Dimensions, mm SOP-8
8 5
FA5310BP(S), FA5314P(S), FA5316P(S) FA5311BP(S), FA5315P(S), FA5317P(S)
s Description
The FA531X series are bipolar ICs for switching power supply control that can drive a power MOSFET. These ICs contain many functions in a small 8-pin package. With these ICs, a high-performance and compact power supply can be created because not many external discrete components are needed.
1 6.05
4
+0.1 –0.05
• Drive circuit for connecting a power MOSFET • Wide operating frequency range (5 to 600kHz) • Pulse-by-pulse overcurrent limiting function • Overload cutoff function (Latch or non-protection mode selectable) • Output ON/OFF control function by external signal • Overvoltage cutoff function in latch mode • Undervoltage malfunction prevention function • Low standby current (90µA typical) • Exclusive choices by circuits (See selection guide on page 25) • 8-pin package (DIP/SOP)
° 0~10
0.4±0.1
1.27±0.2
0.6
DIP-8
8 5
s Applications
• Switching power supply for general equipment
1
9.3 1.5
4
6.5
3.0min 4.5max
3.4
0.3
7.6
s Block diagram FA5310BP(S)/FA5311BP(S)/FA5316P(S)/FA5317P(S)
2.54±0.25
0.5±0.1
0~15
˚
0~1
5˚
Pin No. 1 2 3 4 5 6 7 8
Pin symbol
Description Oscillator timing resistor Feedback Overcurrent (+) detection Ground Output Power supply Oscillator timing capacitor Soft-start and ON/OFF control
RT FB IS (+) GND OUT VCC CT CS
FA5314P(S)/FA5315P(S)
Pin No. 1 2 3 4 5 6 7 8 Pin symbol Description Oscillator timing resistor Feedback Overcurrent (–) detection Ground Output Power supply Oscillator timing capacitor Soft-start and ON/OFF control
RT FB IS (–) GND OUT VCC CT CS
1
2.0max
+0.1 5 –0.0
0.20
s Features
8.2±0.3
5.3
FA531X series
s Selection guide
Type FA5310BP(S) FA5311BP(S) FA5314P(S) FA5315P(S) FA5316P(S) FA5317P(S) Max. duty cycle (typ.) 46% 70% 46% 70% 46% 70% UVLO (typ.) Polarity of overcurrent detection ON threshold OFF threshold + + – – + + 16.0V 16.0V 15.5V 15.5V 15.5V 15.5V 8.70V 8.70V 8.40V 8.40V 8.40V 8.40V Max. output current 1.5A 1.5A 1.5A 1.5A 1.0A 1.0A Application Forward type Flyback type Forward type Flyback type Forward type Flyback type
s Absolute maximum ratings
Item Supply voltage Output current FA5310/11/14/15 FA5316/17 Feedback terminal input voltage Overcurrent detection terminal input voltage CS terminal input current Total power dissipation (Ta=25 °C) Operating temperature Junction temperature Storage temperature Symbol Rating 31 ±1.5 ±1.0 4 –0.3 to +4 2 800 (DIP-8) –30 to +85 125 –40 to +150 *1 550 (SOP-8) *2 Unit V A V V mA mW °C °C °C
s Recommended operating conditions
Item Supply voltage Oscillator timing resistance FA5310/11 FA5314/15/16/17 Soft-start capacitor Oscillation frequency Symbol Min. 10 3.3 1 0.1 5 Max. 30 10 10 1 600 Unit V kΩ
VCC IO VFB VIS ICS Pd Topr Tj Tstg
VCC RT CS fOSC
µF
kHz
Notes: * 1 Derating factor Ta > 25° C : 8.0mW/°C (on PC board ) * 2 Derating factor Ta > 25° C : 5.5mW/°C (on PC board )
s Electrical characteristics (Ta=25°C, Vcc=18V, fOSC=135kHz) Oscillator section
Item Oscillation frequency Frequency variation 1 (due to supply voltage change) Frequency variation 1 (due to temperature change) Symbol Test condition Min. 125 Typ. 135 ±1 ±1.5 Max. 145 Unit kHz % %
fOSC fdV fdr
RT=5.1kΩ , CT=360pF VCC=10 to 30V
Ta=–30 to +85° C
Pulse width modulation circuit section
Item Feedback terminal source current Input threshold voltage (Pin 2) Symbol Test condition FA5310/14/16 Min. Typ. 0.75 1.80 43 46 49 66 FA5311/15/17 Max. Min. Typ. 0.75 2.30 70 74 Max. V V % Unit
IFB VTH FBO VTH FBM DMAX
VFB=0
Duty cycle =0% Duty cycle =DMAX
–660 –800 –960 –660 –800 –960 µA
Maximum duty cycle
Soft-start circuit section
Item Charge current (Pin 8) Input threshold voltage (Pin 8) Symbol Test condition Pin 8=0V Duty cycle =0% Duty cycle =DMAX FA5310/14/16 Min. Typ. –10 0.90 1.90 –15 –5 FA5311/15/17 Max. Min. –15 Typ. –10 0.90 2.30 Max. –5 µA V V Unit
ICHG VTH CSO VTH CSM
2
FA531X series
Overcurrent limiting circuit section
Item Input threshold voltage (Pin 3) Overcurrent detection terminal source current Delay time Symbol Test condition FA5310/11/16/17 Min. Typ. 0.24 0.21 Pin 3=0V 0.27 FA5314/15 Typ. Max. µA ns Unit Max. Min.
VTH IS IIS TPD IS
–0.21 –0.17 –0.14 V
–300 –200 –100 –240 –160 –80 150 200
Latch-mode cutoff circuit section
Item CS terminal sink current Cutoff threshold voltage (Pin 8) Symbol Test condition Pin 8=6V, Pin 2=1V Min. 25 6.5 Typ. 45 7.0 Max. 65 7.5 Unit µA V
ISINK CS VTH CS
Overload cutoff circuit section
Item Cutoff-start voltage (Pin 2) Symbol Test condition Min. 2.6 Typ. 2.8 Max. 3.1 Unit V
VTH FB
Undervoltage lockout circuit section
Item OFF-to-ON threshold voltage ON-to-OFF threshold voltage Symbol Test condition FA5310/11 Min. Typ. 16.0 8.70 15.5 8.20 16.5 9.20 FA5314/15/16/17 Max. Min. 14.8 7.70 Typ. 15.5 8.40 Max. 16.2 9.10 V V Unit
VCC ON VCC OFF
Output section
Item Symbol Test condition FA5.