- 22 -
1
V
CC
8 GND
2
NC
3
GND
4
FB
7 GND
5 DRAIN
(Top View)
PDIP-7
65, 100 or
130 kHz
Clock
Overload?
UVLO
Management
GND
NC
V
CC
FB
Drain
GND
GND
2
1
3
4
IV
CC
I?
Vclamp*
4 V
18 k
Error flag armed?
EMI Jittering
V
CC
Startup Source
Drain
Flip-Flop
DCmax = 65%
Reset
Reset
High when V
CC
3 V
Driver
S
Q
R
-
+
Iref = 7.4 mA
IV
CC
Set
Q
V
CC
8
Rsense
250 ns
L.E.B.
7
5
-
+
+
-
Soft-Start
Startup Sequence
Overload
- +
0.5 V
Drain
*Vclamp = VCC
OFF
+ 200 mV (8.7 V Typical)
PSU Board
U101: NCP1014
PSU Board
U102: SHUNT REGULATOR TL431/A /C
2.5V
REF
REFERENCE
CATHODE
ANODE
