NCP1012 ONSEMI [ON Semiconductor], NCP1012 Datasheet - Page 3

• Manufacturer Part Number: NCP1012
• Description: Self−Supplied Monolithic Switcher for Low Standby−Power Offline SMPS
• Manufacturer: ONSEMI [ON Semiconductor]

GND
V
PIN FUNCTION DESCRIPTION
(SOT−223)
NC
FB
CC
Pin No.
1
−
−
2
3
−
−
4
1
2
3
4
*Vclamp = VCC
Vclamp*
IV
CC
4 V
PDIP−7/Gull Wing)
18 k
I?
(PDIP−7,
V
Pin No.
CC
OFF
Error flag armed?
1
2
3
4
5
−
7
8
+ 200 mV (8.7 V Typical)
Startup Source
Management
EMI Jittering
UVLO
Pin Name
Overload?
Figure 2. Simplified Internal Circuit Architecture
Drain
GND
GND
GND
V
NC
FB
−
CC
High when V
Drain
Powers the Internal Circuitry
Feedback Signal Input
Drain Connection
65, 100 or
http://onsemi.com
Iref = 7.4 mA
The IC Ground
The IC Ground
The IC Ground
130 kHz
Clock
Function
CC
0.5 V
IV
Soft−Start
t 3 V
−
−
CC
3
−
+
Set
+
−
DCmax = 65%
Startup Sequence
Overload
R
Flip−Flop
Reset
Reset
S
Q
This pin is connected to an external capacitor of typi-
cally 10 mF. The natural ripple superimposed on the
V
proved standby performance, an auxiliary V
connected to Pin 1. The V
shunt which serves as an opto fail−safe protection.
By connecting an optocoupler to this pin, the peak
current setpoint is adjusted accordingly to the output
power demand.
The internal drain MOSFET connection.
CC
participates to the frequency jittering. For im-
Q
Driver
V
−
+
CC
Description
250 ns
L.E.B.
CC
−
−
−
−
−
also includes an active
Rsense
Drain
CC
8
7
5
can be
Drain
GND
GND