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参数资料
| 型号： | LA5648 |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, DIP8 |
| 封装： | 0.300 INCH, DIP-8 |
| 文件页数： | 4/5页 |
| 文件大小： | 73K |
| 代理商： | LA5648 |
LA5648
No.A0921-4/5
Pin Description
Pin No.
Pin Name
Description
1
VCC
Power pin
2
OUT
Output pin. Connected to an external MOS-FET gate.
3
COM
Common potential or ground
4
SYC
Sync signal input pin. Base winding voltage is input. If this voltage is negative, the internal triangular wave oscillator
stops and output is set low. The oscillator and output turn on at the timing when the voltage switches from negative to
positive. Fixing this pin at a positive voltage causes the oscillator to run continually, enabling operation using the
external excitation.
5
VPC
Control signal input pin. The secondary side output voltage data is sent to this pin via a photo coupler. Internal PWM
comparator input. The output on time gets shorter as the input voltage lowers. The output on time is fixed when a
voltage higher than a certain level is applied. The timer also starts operation.
6
CF
Oscillation capacitor connection pin.
7
CT
Timer capacitor connection pin. Charging operation starts when the VPC voltage gets higher than a certain level.
Output is stopped when the CT pin voltage becomes higher than a certain level.
8
OCL
Overcurrent detection pin. Connected to the source voltage of the external MOS-FET. The output is stopped by
triggering the internal FF. The internal FF is reset by the SYC pin voltage on a pulse by pulse basis.
Block Diagram
VCC
OUT
COM
SYC
VPC
CF
CT
OCL
1.2V Vref
3.5V Vref
LOGIC
+
-
+
-
UVLO
TRIANG OSC
PWM COMP
TIMER
+
-
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