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NCP1381 Datasheet(PDF) 2 Page - ON Semiconductor

Part No. NCP1381
Description  Low−Standby High Performance PWM Controller
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP1381 Datasheet(HTML) 2 Page - ON Semiconductor

 
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NCP1381
http://onsemi.com
2
TYPICAL APPLICATION EXAMPLE
1
2
3
4
5
6
7
9
10
11
12
13
14
8
HV
BO
DMG
OVP
GTS_ADJ
+
+
+
Skip
GTS_ADJ
Vout
PFC Stage
To PFC’s VCC
Vref
+
OPP
NCP1381
Figure 1. Typical Application Example
PIN FUNCTION DESCRIPTION
Pin#
Symbol
Description
1
GTS_ADJ
GTS Level Adjustment
An internal comparator senses the signal applied to this pin (typically a portion of
FB signal) to detect the standby condition for GTS.
2
BO
Brown−out
By connecting this pin to a resistive divider, the controller ensures operation at a
safe mains level.
3
DMG
Detects the Zero Voltage
Crossing Point
This pin detects the core reset event but also permanently senses the Flyback
plateau, offering a clean OVP detection.
4
Timer
Fault Timer
Connecting a capacitor to this pin adjusts the fault timer.
5
Skip/OVP
Adjust the Skip Level
This pin alters the default skip cycle level and offers a mean to latchoff the con-
troller when externally brought above 4 V.
6
FB
Feedback Signal
An optocoupler collector pulls this pin down to regulate. When the current set-
point falls below an adjustable level, the controller skips cycles.
7
CS
Current Sense Pin
This pin cumulates two different functions: the standard sense function plus an
adjustable offset voltage providing the adequate level of Overpower Protection.
8
GND
The IC Ground
9
DRV
The Driver Output
With a drive capability of
$500 mA/800 mA, the NCP1381 can drive large Qg
MOSFETs.
10
VCC
VCC Input
The controller accepts voltages up to 20 V and features an UVLO of 10 V typical.
11
GTS
Directly Powers the PFC
Frontend Stage
This pin directly powers the PFC controller by routing the PWM VCC to the PFC
VCC. In standby (defined by GTS_ADJ), fault and BO conditions, this pin is open
and the PFC is no longer supplied.
12
Reference
Reference Voltage
This pin offers a 5 V reference voltage sourcing up to 10 mA.
13
NC
Not Connected
14
NC
Not Connected


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