HA16341FP HITACHI [Hitachi Semiconductor], HA16341FP Datasheet - Page 4

• Manufacturer Part Number: HA16341FP
• Description: Redundant Secondary Switching Power Supply Controller
• Manufacturer: HITACHI [Hitachi Semiconductor]

HA16341NT/FP, HA16342NT/FP
Block Diagram
Rev.1, Jan. 2001, page 4 of 21
PWM OUT
SGND
PGND
CS(+)
CS(−)
HSP
Vref
Trig
Cin
MT
CB
SS
CT
128.5k
PG1
Current share input
100k
Driver
Driver
UVL2
R
RS-FF
to latch B reset
R
Start-up latch
Vref 5V
OP1-2
+
−
+
−
+
−
initial: Lo
OP1
OP2
OP3
19R
SS comp.
R
R
latch A
2.5V
Point B
−
+
+
−
26dB
6dB
−
+
Q
S
OCL
Exit trigger control
Delay
S2
E/IN = 95% comp.
16 pulse
delay
S1
OCL
S
R
RS-FF
latch C
+
+
−
−
Q
Q
S
Q
RS-FF
latch B
CT level
compression
E/IN
1.187V
from B
1.25V
939µA
R
+
CT'
Hi: stop
169µA
(only HA16341)
Reverse
current
comp.
−12mV
Oscillator
UVL2
Vref
S
R
latch D
Vref 5V
+
−
+
+
−
SW1
CS(+)
−
Q
Q
DB generator
Hi: PWM ON
Start-up latch
SW1 on: 1.3V
SW1 off: 3.4V
initial: Hi
V
1.25V
Z
= 1.24V
2R
2R
2R
UVL1
+
−
R
Dead Band adjust
+
−
OP5
10k
2R
0dB
+
20dB
−
2R
R
V
OVP
90k
PG1
Z
1.25V
= 6.8V
Light load detector
Error amp.
OP4
+
−
+
−
R
+
−
from Trig
SW2 on
at HSP Hi
Hi: 0.7V
Lo: 0.5V
−
+
−
+
OP6
7.5V
Hi: 2.5V
Lo: 2.0V
1.25V
1k
1k
R
0dB
Driver
Driver
−
+
SW2
FAIL
50k
Unit R: Ω
EIN
EOUT
CFB
CF(+)
CF(−)
CFo
PGND
MF OUT
VCC
MR OUT
DB
PG1
FAIL
C: F