ncp1001 ON Semiconductor, ncp1001 Datasheet - Page 2

• Manufacturer Part Number: ncp1001
• Description: Integrated Off-line Switching Regulator
• Manufacturer: ON Semiconductor

1. This device series contains ESD protection and exceeds the following tests:
2. This device contains Latch−up protection and exceeds $200 mA per JEDEC Standard JESD78.
MAXIMUM RATINGS
Power Switch Circuit (Pin 5)
Power Supply Voltage Range (Pin 1)
Feedback Input (Pin 2)
Thermal Resistance
Operating Junction Temperature
Storage Temperature
Drain Voltage Range
Drain Current Peak During Transformer Saturation
Voltage Range
Current
P Suffix, Plastic Package Case 626
Pins 4 and 5 are the HV start−up and the drain of the LDMOS device, rated only to the max rating of the part , or 700 V.
3, 6, 7, 8
Junction to Lead
Junction to Air, 2.0 Oz. Printed Circuit Copper Clad
0.36 Sq. Inch
1.0 Sq. Inch
Pin
Pins 1−3:
1
2
4
5
Power Switch Circuit
Human Body Model 2000 V per MIL−STD−883, Method 3015.
Machine Model Method 200 V.
Feedback Input
Function
Start−up
Ground
(Notes 1 and 2)
V
CC
Rating
Positive input supply voltage. This pin is connected to an external capacitor for energy storage.
The start−up circuit sources current out of this pin to initially charge the capacitor. When the
voltage reaches the upper threshold limit of the undervoltage lockout circuit, the start−up circuit
will turn off, and the power supply will begin operation. Power is then supplied to the chip via
this pin, by virtue of the auxiliary winding.
The error signal from the optocoupler is fed into this input. It is loaded with
a 2.7 kW resistor which converts the opto current into a voltage. There
is a 7.0 kHz, single pole, low pass filter between this pin and the error amp input. A 10 volt
clamp is also connected to this pin to protect the device from ESD damage or overvoltage con-
ditions.
Ground reference pin for the circuit. These pins are part of the integrated circuit leadframe and
are an integral part of the heat flow path on the DIP−8 package.
This pin is connected to the bulk DC input voltage supply. It feeds an internal current source that
initially charges up the V
The internal power switch circuit is connected between this pin and ground. This pin connects
directly to one end of the transformer primary winding.
NCP1000, NCP1001, NCP1002
Functional Pin Description
http://onsemi.com
CC
2
capacitor on power up.
Description
Symbol
I
DS(pk)
V
R
R
V
V
T
T
I(fb)
l
qJA
qJL
stg
DS
clp
fb
J
*65 to +150
*0.3 to 700
2.0 I
*40 to 125
*0.3 to 10
*0.3 to 10
Value
100
lim
5.0
45
35
Max
Unit
mA
C/W
V
A
V
V
C
C