ha16138 HITACHI, ha16138 Datasheet - Page 17

• Manufacturer Part Number: ha16138
• Description: Ac/dc Switching Converter Controller With High-voltage Power
• Manufacturer: HITACHI

Application Circuit Examples 3
As this IC is provided with a remote on/off function, it is possible to implement power management
without turning off the power supply. Using a remote on/off control circuit as shown in the figure below,
the CT pin voltage is pulled up to the off mode start voltage or above, and the IC is stopped. In the off
mode, control of PWM output stoppage, soft start resistance resetting, and starter circuit stoppage is
performed without stopping the internal reference voltage generation circuit. With this function, also, latch
operation is not performed, and an auto-restart is executed as soon as the CT pin voltage falls below the off
mode start voltage. It is recommended that the remote on/off control signal be controlled by a
microcomputer or other logic signal.
1
2
3
4
DRAIN
DRAIN
VDD
FB
HA16138PS
SOURCE
COMP
SGND
CT
8
7
6
5
CT
220p
Remote ON/OFF control circuit
2SA1029
R1
10k
2SC458
R2
43k
R3
130k
10k
R4
Units R:
ON/OFF
H: OFF
L: ON
C: F
HA16138PS
17