NCP1382 PWM Controller Datasheet

NCP1382 Datasheet, PDF, Equivalent


Part Number

NCP1382

Description

Low Standby High Performance PWM Controller

Manufacture

ON Semiconductor

Total Page 25 Pages
Datasheet
Download NCP1382 Datasheet


NCP1382
NCP1381, NCP1382
Low- Standby High
Performance PWM
Controller
Housed in a SO--14 package, the NCP1381/82 includes everything
needed to build rugged and efficient Quasi--Resonant (QR) Switching
Power Supplies. When powered by a front--end Power Factor
Correction circuitry, the NCP1381/82 automatically disconnects the
PFC controller in low output loading conditions (with an adjustable
level), thus improving the standby power. This is particularly well
suited for medium to high power offline applications, e.g. notebook
adapters. When the current setpoint falls below a given value, e.g. the
output power demand diminishes, the IC automatically enters the
so--called skip cycle mode and provides excellent efficiency at light
loads. Because this occurs at an adjustable low peak current together
with a proprietary Soft--Skipt technique, no acoustic noise takes
place. Skip cycle also offers the ability to easily select the maximum
switching frequency at which foldback and standby take place.
The NCP1381/82 also features several efficient protection options
like a) a short--circuit / overload detection independent of the auxiliary
voltage b) an auto--recovery brown--out detection and c) an input to
externally latch the circuit in case of Overvoltage Protection or Over
Temperature Protection.
Features
Current--Mode Quasi--Resonant Operation
Adjustable Line Over Power Protection
Extremely Low Startup Current of 15 mA Maximum
Soft--Skip Cycle Capability at Adjustable Peak Currents
Plateau Sensing Overvoltage
Brown--Out Protection
Maximum tON Limitation
Overpower Protection by current Sense Offset
Internal 5 ms Soft--Start Management
Short--Circuit Protection Independent from Auxiliary Level
External Latch Input Pin for an OTP Signal
Go--To--Standby Signal for the PFC Front Stage
True Frequency (tON + tOFF) Clamp Circuit
Low and Noiseless, No--Load Standby Power
Internal Leading Edge Blanking
+500 mA / --800 mA Peak Current Drive Capability
5 V / 10 mA Reference Voltage
These are Pb--Free Devices
Typical Applications
High Power AC/DC Adapters for Notebooks, etc
Offline Battery Chargers
Set--Top Boxes Power Supplies, TV, Monitors, etc
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HIGH PERFORMANCE QR
CONTROLLER FEATURING PFC
SHUTDOWN
14
1
MARKING
DIAGRAM
14
SOIC--14
D SUFFIX
CASE 751A
1
NCP138xG
AWLYWW
NCP138xG = Specific Device Code
x = 1 or 2
A = Assembly Location
WL = Wafer Lot
Y = Year
WW = Work Week
G = Pb--Free Package
ADJ_GTS
BO
DMG
Timer
Skip/OVP
FB
CS
1
2
3
4
5
6
7
14 nc
13 nc
12 Ref
11 GTS
10 VCC
9 DRV
8 GND
ORDERING INFORMATION
Device
Package
Shipping
NCP1381DR2G SOIC--14 2500/Tape & Reel
(Pb--Free)
NCP1382DR2G SOIC--14 2500/Tape & Reel
(Pb--Free)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
Semiconductor Components Industries, LLC, 2010
November, 2010 -- Rev. 5
1
Publication Order Number:
NCP1381/D

NCP1382
NCP1381, NCP1382
TYPICAL APPLICATION EXAMPLE
HV PFC Stage
+
To PFC’s VCC
+
OVP
BO
DMG
NCP1381/82
GTS_ADJ 1
2
14
13
3 12
4 11
5 10
69
Skip
7
8
Vref
+
+
Vout
GTS_ADJ
OPP
Figure 1. Typical Application Example
PIN FUNCTION DESCRIPTION
Pin#
Symbol
1 GTS_ADJ
GTS Level Adjustment
2 BO
Brown--out
3 DMG Detects the Zero Voltage
Crossing Point
4 Timer
Fault Timer
5 Skip/OVP
Adjust the Skip Level
6 FB
Feedback Signal
7 CS
Current Sense Pin
8 GND
9 DRV
The IC Ground
The Driver Output
10 VCC
VCC Input
11 GTS Directly Powers the PFC
Frontend Stage
12 Reference
13 NC
14 NC
Reference Voltage
--
--
Description
An internal comparator senses the signal applied to this pin (typically a portion of
FB signal) to detect the standby condition for GTS.
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 Qg
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 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.
This pin offers a 5 V reference voltage sourcing up to 10 mA.
Not Connected
Not Connected
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2


Features NCP1381, NCP1382 Low- Standby High Perfo rmance PWM Controller Housed in a SO--1 4 package, the NCP1381/82 includes ever ything needed to build rugged and effic ient Quasi--Resonant (QR) Switching Pow er Supplies. When powered by a front--e nd Power Factor Correction circuitry, t he NCP1381/82 automatically disconnects the PFC controller in low output loadi ng conditions (with an adjustable level ), thus improving the standby power. Th is is particularly well suited for medi um to high power offline applications, e.g. notebook adapters. When the curren t setpoint falls below a given value, e .g. the output power demand diminishes, the IC automatically enters the so--ca lled skip cycle mode and provides excel lent efficiency at light loads. Because this occurs at an adjustable low peak current together with a proprietary Sof t--Skipt technique, no acoustic noise t akes place. Skip cycle also offers the ability to easily select the maximum sw itching frequency at which foldback and standby take place. The.
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