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NCP1014 Datasheet(PDF) 3 Page - ON Semiconductor

Part No. NCP1014
Description  Self-Supplied Monolithic Switcher for Low Standby- Power Offline SMPS
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP1014 Datasheet(HTML) 3 Page - ON Semiconductor

 
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NCP1010, NCP1011, NCP1012, NCP1013, NCP1014
http://onsemi.com
3
PIN FUNCTION DESCRIPTION
Pin No.
(SOT−223)
Pin No.
(PDIP−7,
PDIP−7/Gull Wing)
Pin Name
Function
Description
1
1
VCC
Powers the Internal Circuitry
This pin is connected to an external capacitor of typi-
cally 10
mF. The natural ripple superimposed on the
VCC participates to the frequency jittering. For im-
proved standby performance, an auxiliary VCC can be
connected to Pin 1. The VCC also includes an active
shunt which serves as an opto fail−safe protection.
2
NC
3
NC
2
4
FB
Feedback Signal Input
By connecting an optocoupler to this pin, the peak
current setpoint is adjusted accordingly to the output
power demand.
3
5
Drain
Drain Connection
The internal drain MOSFET connection.
7
NC
This unconnected pin ensures adequate creepage
distance.
4
8
GND
The IC Ground
65, 100 or
130 kHz
Clock
Overload?
UVLO
Management
NC
NC
VCC
FB
Drain
NC
GND
Figure 2. Simplified Internal Circuit Architecture
2
1
3
4
IVCC
I?
Vclamp*
4 V
18 k
Error flag armed?
EMI Jittering
VCC
Startup Source
Drain
Flip−Flop
DCmax = 65%
Reset
Reset
High when VCC t 3 V
Driver
S
Q
R
+
Iref = 7.4 mA
IVCC
Set
Q
VCC
8
Rsense
250 ns
L.E.B.
7
5
+
+
Soft−Start
Startup Sequence
Overload
0.5 V
Drain
*Vclamp = VCCOFF + 200 mV (8.7 V Typical)


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