NCP1201
http://onsemi.com
4
PIN FUNCTION DESCRIPTION
Pin No. Pin Name Function Description
1 BOK Bulk OK This pin detects the input line voltage by sensing the bulk capacitor, and
disables the PWM when line voltage is lower than normal.
2 FB Sets the Peak Current Setpoint By connecting an optocoupler to this pin, the peak current setpoint is ad-
justed according t o the output power demand. Internal monitoring of this
pin level triggers the fault management circuitry.
3 CS Current Sense Input This pin senses the primary inductor current and routes it to the internal
comparator via an LEB circuit.
4 GND The IC Ground --
5 DRV Driving Pulses The driver’s output to an external MOSFET.
6 VCC Supplies the IC
This pin is connected to an external bulk capacitor of typically 10 mF.
7 NC No Connection This unconnected pin ensures adequate creepage distance between High
Voltage pin to other pins.
8 HV Generates the V
CC
from the Line Connected to the high--voltage rail, this pin injects a constant current into
the V
CC
capacitor.
MAXIMUM RAT INGS (T
J
=25C unless otherwise noted)
Rating Symbol Value Unit
Power S upply Voltage, Pin 6 V
CC
--0.3, 16 V
Input/Output Pins
Pins 1, 2, 3, 5
V
IO
--0.3, 6.5 V
Maximum Voltage on Pin 8 (HV) V
HV
500 V
Thermal Resistance, Junction--to--Air, PDIP--8 Version
Thermal Resistance, Junction--to--Air, SOIC Version
R
θ
JA
R
θ
JA
100
178
C/W
C/W
Operating Junction Temperature Range T
J
--40 to +150 C
Operating Ambient Temperature Range T
A
--25 to +125 C
Storage Temperature Range T
stg
--55 to +150 C
ESD Capability, HBM (All pins except V
CC
and HV pins) (Note 1) -- 2.0 kV
ESD Capability, Machine Model (All pins except V
CC
and HV pins) (Note 1) -- 200 V
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. This device series contains ESD protection and exceeds the following tests:
Human B ody Model (HBM) > 2.0 kV per JEDEC standard: JESD22--A114.
Machine M odel (MM) > 200 V per JEDEC standard: JESD22--A115.
2. Latchup Current Maximum Rating: 150 mA per JEDEC standard: JESD78.
