NCP1381 ONSEMI [ON Semiconductor], NCP1381 Datasheet - Page 2

• Manufacturer Part Number: NCP1381
• Description: Low−Standby High Performance PWM Controller
• Manufacturer: ONSEMI [ON Semiconductor]

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