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KA7577 is fixed frequency PWM controller and specially designed for SMPS to get regulated DC voltage from AC power supply. This integrated circuit has so fast rise and fall output pulse that it can directly drive power transistor as well as power MOSFET. This device features high speed and high sensitive current limiting. Protection circuitry include current limiting function against short and over current at secondary side, owing to the integrated timertype-protection circuit.
KA7577 General Description
SMPS Controller
KA7577 Maximum Ratings
Parameter
Symbol
Value
Unit
Supply Voltage
VCC
31
V
Supply Voltage
VC
31
V
Output DC Current
IO(DC)
± 0.5
A
Output Peak Voltage
IOPK
± 2
A
VF Terminal Voltage
V(VF)
31
V
VON/OFF Terminal Voltage
V(ON/OFF)
31
V
Current Limiting (-) Terminal Voltage
V(CLM - )
- 4 ~+4
V
Current Limiting (+) Terminal Voltage
V(CLM -+)
- 0.3 ~+4
V
Over Voltage Protection Terminal Voltage
V(OVP)
31
V
Detection Terminal Voltage (Note 1)
V(DET)
6
V
Detection Terminal Sink Current (Note 1)
ISINK(DET)
5
mA
Feedback Terminal Voltage
V(FB)
0 - 10
V
Timer ON Terminal Source Current
ISOURCE(T-ON)
-1
mA
Timer OFF Terminal Source Current
ISOURCE(T-OFF)
-1
mA
Power Dissipation
PD
1.5
W
hermal Derating Factor
KTD
12
mW/°C
Operating Temperature Range
TOPR
- 25 ~ +85
°C
Storage Temperature Range
TSTG
- 40 ~ +125
°C
Junction Temperature
TJ
150
°C
Note: 1. This terminal has the constant voltage characteristics of 6-8V, when current is supplied from out side. The maximum allowable voltage is 6V when the constant voltage is applied to this terminal. And maximum allowable current is 5mA, it is recommended to use current limiting resistor.