HA16107P Datasheet, PDF (8/40 Pages) Hitachi Semiconductor – PWM Switching Regulator for High-performance Voltage Mode Control

HA16107P/FP, HA16108P/FP
• Timing waveforms
16.2 V
V_IN
9.5 V
6.45 V
5V
Vref
4V
0V
V_CT, V_ST,
V_E/O
4.2 V
3.8 V
2.2 V
0V
V_OUT
(PWM pulse)
V_IN
0V
Level determined by transformer
V_IN
Vref
V_ST
V_CT
C_ST discharge
Soft start
V_E/O
Quick shutdown
Normal operation
(Time t)
Vref
9
Vref
from Vref
C_ST
ST
10
Zener
3.8 V ^diode
10 µA
from UVL2
(Effective for
quick shutdown)
+
+
− _{PWM comparator}
V_CT
E/O
15
7
Note: The soft-start time constant is determined by C_ST and the constant-current value (typically 10 µA).
Rev.4.00 Jun 15, 2005 page 8 of 39