Document
FA5304AP(S)/FA5305AP(S)
s Description
The FA5304AP(S) and FA5305AP(S) are bipolar ICs for switching power supply control and can directly drive a power MOSFET. These ICs contain many functions in a small 8-pin package. With these ICs, a high-performance power supply can be created compactly because not many external components are needed.
Bipolar IC For Switching Power Supply Control FA5304AP(S)/FA5305AP(S)
s Dimensions, mm SOP-8
8 5
s Features
• Drive circuit for connecting a power MOS-FET (IO = ±1.5A) • Wide operating frequency range (5 to 600kHz) • Pulse-by-pulse overcurrent limiting function Positive voltage detection: FA5304AP(S) Negative voltage detection: FA5305AP(S) • Overload cutoff function (Latch or non-protection mode selectable) • Output ON/OFF control function by external signals • Overvoltage cutoff function in latch mode • Undervoltage malfunction prevention function (ON at 16V and OFF at 8.7V) • Error amplifier for control by tertiary winding detection • Low standby current (90µA typ.) • 8-pin package (DIP/SOP)
1 6.05
4
+0.1 –0.05
8.2±0.3
5.3
° 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
2.54±0.25
0.5±0.1
0~15
˚
0~1
5˚
2.0max
+0.1 5 –0.0
0.20
1
FA5304AP(S)/FA5305AP(S)
s Block diagram FA5304AP(S)
Pin No. 1 2 3 4 5 6 7 8
Pin symbol
Description Inverting input to error amplifier Error amplifier output Overcurrent (+) detection Ground Output Power supply Oscillator timing capacitor Soft-start and ON/OFF control
IN (–) FB IS (+) GND OUT VCC CT CS
FA5305AP(S)
Pin No. 1 2 3 4 5 6 7 8
Pin symbol
Description Inverting input to error amplifier Error amplifier output Overcurrent (–) detection Ground Output Power supply Oscillator timing capacitor Soft-start and ON/OFF control
IN (–) FB IS (–) GND OUT VCC CT CS
2
FA5304AP(S)/FA5305AP(S)
s Absolute maximum ratings Common to FA5304AP(S) and FA5305AP(S)
Item Supply voltage Output current Error amplifier input voltage Feedback terminal input voltage Overcurrent detection terminal input voltage CS terminal input current Total power dissipation (Ta = 25° C) Operating temperature Storage temperature Symbol Rating 30 ±1.5 4 4 –0.3 to +4 2 800 (DIP-8) *1 550 (SOP-8) *2 –30 to +85 –40 to +150 Unit V A V V V mA mW °C °C
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 Recommended operating conditions Common to FA5304AP(S) and FA5305AP(S)
Item Supply voltage Symbol Min. 10 100 0.1 5 1 600 Max. 30 Unit V kΩ
VCC IO VIN VFB VIS ICS Pd Topr Tstg
VCC Error amplifier feedback resistor RNF Soft-start capacitor CS Oscillation frequency fOSC
µF
kHz
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 2 (due to temperature change)
Common to FA5304AP(S) and FA5305AP(S)
Symbol Test condition Min. 112 Typ. 135 ±1 ±4 Max. 148 Unit kHz % %
fOSC fdv fdT
CT = 360pF VCC = 10 to 30V Ta = –30 to +85°C
Error amplifier section
Item Reference voltage Input bias current Open-loop voltage gain Unity-gain bandwidth Maximum output voltage (Pin 2) Output source current (Pin 2)
Common to FA5304AP(S) and FA5305AP(S))
Symbol Test condition Min. 1.90 –500 80 1.0 Typ. 2.00 –50 Max. 2.10 Unit V nA dB MHz V 200 –100 –50 mV
VB IB AV fT VOM+ VOM– IMO+
V1 = 2V
RNF = 100kΩ RNF = 100kΩ VOM = 1V
2.70
µA
Pulse width modulation circuit section
Item Input threshold voltage (Pin 2) Maximum duty cycle
Common to FA5304AP(S) and FA5305AP(S)
Symbol Test condition Duty cycle = 0% Duty cycle = DMAX Min. 0.80 1.70 42 Typ. 1.00 1.90 45 Max. 1.20 2.10 50 Unit V V %
VTH FBO VTH FBM DMAX
Soft-start circuit section
Item Charge current (Pin 8) Input threshold voltage (Pin 8)
Common to FA5304AP(S) and FA5305AP(S)
Symbol Test condition Pin 8 = 0V Duty cycle = 0% Duty cycle = DMAX Min. –15 0.80 1.70 Typ. –10 1.00 1.90 Max. –5 1.20 2.10 Unit
ICHG VTH CSO VTH CSM
µA
V V
3
FA5304AP(S)/FA5305AP(S)
Overcurrent limiting circuit section
Item Input threshold voltage (Pin 3) Overcurrent detection terminal source current Delay time Symbol Test condition FA5304AP(S) Min. Typ. 0.24 150 0.20 Pin 3 = 0V 0.28 FA5305AP(S) Max. Min. Typ. Max. Unit
VTH IS IIS TPD IS
–0.20 –0.17 –0.14 V
–300 –200 –100 –240 –160 –80 200
µA
ns
Latch-mode cutoff circuit section
Item CS terminal sink current Cutoff threshold voltage (Pin 8)
Common to FA5304AP(S) and FA5305AP(S)
Symbol Test condition Pin 8 = 6V, Pin 2 = 1V Min. 40 6.5 Typ. 70 7.0 Max. 150 7.5 Unit
ISINK CS VTH CS
µA
V
Overload cutoff circuit section
Item Cutoff threshold voltage (Pin 2)
Common to FA5304AP(S) and FA5305AP(S)
Symbol Test condition Min. 2.5 Typ. 2.7 Max. 2.9 Unit V
VTH FB
Undervoltage lock-out circuit section Common to FA5304AP(S) and FA5305AP(S)
Item OFF-to-ON threshold voltage ON-to-OFF threshold voltage Voltage h.