HA16654A Datasheet, PDF (13/15 Pages) Hitachi Semiconductor – PWM Controlled Switching Regulator

HA16654A, HA16664A Series
V_IN Bias Point
HA16654A
10
Back up supply voltage
Quick shutdown
8 ^area
6
Soft start area
(f ≅ 500 kHz)
Ta = 25°C
HA16664A
10
(f ≅ 100 kHz)
Ta = 25°C
8
Back up supply voltage
Quick shutdown
6 area
4
1/R_IN
2
Low input
malfunction prevention area
0
8 10
20
30
40
Va
V_IN (V)
4
Soft start area ^1/RIN
2
Low input
malfunction prevention area
0
8 10
20
30
40
Va
V_IN (V)
Primary Control Forward Converter System
AC
R.F.I
Filter
Soft Start Capacitor
0.47 µF
R₁ R₂
13 k Ω 39 kΩ
(11 kΩ)
V_B
R_IN
V_OUT
+
HA16654A
(HA16664A)
D667 _{Power MOS FET}
B647
+
HA17431
220 pF C _T
27 kΩ (150 kΩ)
(330 pF)
R_T
51 kΩ
13