HA17384SPS Datasheet, PDF (4/29 Pages) Hitachi Semiconductor – High Speed Current Mode PWM Control IC for Switching Power Supply

HA17384SPS/SRP, HA17384HPS/HRP, HA17385HPS/HRP
Block Diagram
COMP 1
FB
(OVP input)
2
CS 3
RT/CT 4
0.8mA
−
EA
+
6.5V
1
2
Vref
(2.5V)
−
OVP
+ _*1
7.0V
2V_F
2R
R
1V
UVL1
H
L
VL VH
OVP
latch
RQ
S
5V band
gap
reference
regulator
UVL2
Vref > 4.7V
TSD
sense
OR
160°C
−
CS
+
CS
latch
R
SQ
PWM LOGIC
Vref
NOR
OUT
Totem pole
output circuit
Oscillator
+
−
1.2V
2.8 V
Latch set
pulse
8 Vref
7 V_IN
34V
6 OUT
5 GND
8.4 mA
Note: 1. Blocks with bold line are not included in HA17384SPS/SRP.
Rev.3.00 Jun 15, 2005 page 4 of 28