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NCP1055ST44T3G Datasheet(PDF) 2 Page - ON Semiconductor

Part # NCP1055ST44T3G
Description  Monolithic High Voltage Gated Oscillator Power Switching Regulator
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1055ST44T3G Datasheet(HTML) 2 Page - ON Semiconductor

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NCP1050, NCP1051, NCP1052, NCP1053, NCP1054, NCP1055
http://onsemi.com
2
Figure 1. Typical Application
Startup & VCC
Regulator Circuit
VCC
Fault Detector
Power
Switch
Circuit
Oscillator &
Gating Logic
Control Input
Power Switch Circuit Output
3, 7−8
1
2
5
+
Snubber
+
+
+
Converter
DC Output
AC Line
Input
Ground
Pin Function Description
Pin
(SOT−223)
Pin
(PDIP−8)
Function
Description
1
1
VCC
This is the positive supply voltage input. During startup, power is supplied to this input
from Pin 5. When VCC reaches VCC(on), the Startup Circuit turns off and the output is
allowed to begin switching with 1.0 V hysteresis on the VCC pin. The capacitance con-
nected to this pin programs fault timing and frequency modulation rate.
2
2
Control Input
The Power Switch Circuit is turned off when a current greater than approximately 50
mA
is drawn out of or applied to this pin. A 10 V clamp is built onto the chip to protect the
device from ESD damage or overvoltage conditions.
4
3, 7, 8
Ground
This pin is the control circuit and Power Switch Circuit ground. It is part of the integrated
circuit lead frame.
4
No Connection
3
5
Power Switch
Drain
This pin is designed to directly drive the converter transformer primary, and internally
connects to Power Switch and Startup Circuit.


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