NCP1338PG ONSEMI [ON Semiconductor], NCP1338PG Datasheet

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NCP1338PG

Manufacturer Part Number
NCP1338PG
Description
PWM Current-Mode Controller for Free Running Quasi-Resonant Operation
Manufacturer
ONSEMI [ON Semiconductor]
Datasheet
NCP1338
PWM Current-Mode
Controller for Free Running
Quasi-Resonant Operation
demagnetization detector which ensures full Borderline/Critical
Conduction Mode in any load/line conditions together with
minimum drain voltage switching (Quasi-Resonant operation). The
transformer core reset detection is done internally, without using any
external signal, due to the Soxyless concept. The frequency is
internally limited to 130 kHz, preventing the controller from
operating above the 150 kHz CISPR-22 EMI starting limit.
ripple mode as soon as the power demand falls below a
predetermined level. As each restart is softened by an internal
Soft-Skipt, and as the frequency cannot go below 25 kHz, no
audible noise can be heard.
in presence of an overcurrent condition, disables the output pulses
and enters a safe burst mode, trying to restart. Once the default has
gone, the device auto-recovers. Also included is a bulk voltage
monitoring function (known as brown-out protection), an adjustable
overpower compensation, and a V
Soft-Skip eliminates the traditional startup stress. NCP1338 can be
used in applications where the V
external dc voltage source.
Features
Typical Applications
© Semiconductor Components Industries, LLC, 2008
April, 2008 - Rev. 0
The NCP1338 combines a true current mode modulator and a
By monitoring the feedback pin activity, the controller enters
The NCP1338 also features an efficient protective circuitry which,
Voltage
function, and the other for a permanent latch)
Free-Running Borderline/Critical Mode Quasi-Resonant Operation
Current-Mode
Soft-Skip Mode with Minimum Switching Frequency for Standby
Auto-Recovery Short-Circuit Protection Independent of Auxiliary
Overvoltage Protection
Brown-Out Protection
Two Externally Triggerable Fault Comparators (one for a disable
Internal 4.0 ms Soft-Skip
500 mA Peak Current Drive Sink Capability
130 kHz Max Frequency
Internal Leading Edge Blanking
Internal Temperature Shutdown
Direct Optocoupler Connection
Dynamic Self-Supply with Levels of 12 V (On) and 10 V (Off)
SPICE Models Available for TRANsient and AC Analysis
These are Pb-Free Devices
Ac-dc Adapters for Notebooks, etc.
Offline Battery Chargers
Consumer Electronics (DVD Players, Set-Top Boxes, TVs, etc.)
Auxiliary Power Supplies (USB, Appliances, TVs, etc.)
CC
CC
supply voltage is delivered by an
OVP. Finally, an internal 4.0 ms
1
†For information on tape and reel specifications,
NCP1338PG
NCP1338DR2G
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
Device
(Note: Microdot may be in either location)
GND
ORDERING INFORMATION
BO
CS
FB
A
WL, L
YY, Y
WW, W = Work Week
G, G
PIN CONNECTIONS
http://onsemi.com
1
2
3
4
CASE 626B
CASE 751U
P SUFFIX
D SUFFIX
SOIC-7
PDIP-7
= Assembly Location
= Wafer Lot
= Year
= Pb-Free Package
(Top View)
(Pb-Free)
(Pb-Free)
Package
PDIP-7
SOIC-7
Publication Order Number:
8
6
5
7
1
2500 Tape & Reel
8
1
HV
VCC
DRV
50 Units/Rail
MARKING
DIAGRAM
Shipping†
NCP1338P
NCP1338/D
ALYWG
P1338
YYWWG
G
AWL

Related parts for NCP1338PG

NCP1338PG Summary of contents

Page 1

... GND DRV (Top View) ORDERING INFORMATION Device Package Shipping† NCP1338PG PDIP-7 50 Units/Rail (Pb-Free) NCP1338DR2G SOIC-7 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 Specification Brochure, BRD8011/D ...

Page 2

PIN FUNCTION DESCRIPTION Pin No. Symbol Function 1 BO Brown-out and external triggering 2 FB Sets the peak current setpoint 3 CS Current sense input and overpower compensation adjustment 4 GND IC ground 5 DRV Output driver 6 VCC IC ...

Page 3

DISABLE + + Vdd BOK 500 mV OVP Skip - + 100 mV Vdd + 130 mV FB Setpoint kHz ...

Page 4

MAXIMUM RATINGS Rating ) is Decoupled to Ground with 10 mF Voltage on Pin 8 (HV) when Pin Maximum Current in Pin 8 (HV) Power Supply Voltage, Pin and Pin 5 (DRV) CC Maximum ...

Page 5

ELECTRICAL CHARACTERISTICS (For typical values unless otherwise noted.) CC Characteristic SUPPLY SECTION V Increasing Level at which the Controller Starts CC V Decreasing Level at which the Controller Stops CC Protection Mode is Activated if ...

Page 6

ELECTRICAL CHARACTERISTICS (continued) (For typical values T Max T = 150° unless otherwise noted Characteristic FEEDBACK SECTION FB Current under which FAULT is Detected FB Current for which Internal Setpoint is 100% FB Current ...

Page 7

INTRODUCTION The NCP1338 implements a standard current mode architecture where the switch-off time is dictated by the peak current setpoint, whereas the core-reset detection triggers the turn-on event. This component represents the ideal candidate where low part-count is the key ...

Page 8

V CC VCC ON VCC MIN At startup, a 4.0 ms Soft-Skip is activated. If the current Setpoint is above the fault level, FAULT flag is raised. CS Setpoint Fault V CSstby CS V CSLimit FAULT SS TIMER When FAULT ...

Page 9

V CC VCC ON VCC MIN VCC LATCH CS Overload Setpoint Fault When the current setpoint rises above fault level, FAULT flag is activated CSLimit FAULT When FAULT flag TIMER is activated, timer is restarted ...

Page 10

VCC VCC on VCC min CS Setpoint VCS rippleOUT VCS rippleIN CS (envelope) Min T ON NCP1338 Soft-Skip on each re-start Figure 5. Soft-Skip Mode in Standby http://onsemi.com 10 ...

Page 11

Soxyless The “Valley point detection” is based on the observation of the Power MOSFET Drain voltage variations. When the transformer is fully demagnetized, the Drain voltage evolution from the plateau level down to the V is governed by the resonating ...

Page 12

The input information is the current injected in FB pin by the feedback loop. The range of current is from 40 mA for overload detection to 220 mA corresponding transients, currents from 0 to more than 400 ...

Page 13

NCP1338 V in 3.3 meg BO Rhyst 11 k Figure 8. Internal Implementation of BO Pin http://onsemi.com + Permanent Latch - + Enable + + 3 V Vdd 10 mA current source activated when V is high ...

Page 14

NOTE 2 C -T- N SEATING PLANE 0.13 (0.005 - - -T- SEATING PLANE H D ...

Page 15

Soft-Skip is a trademark of Semiconductor Components Industries, LLC (SCILLC). The product described herein (NCP1338), may be covered by the following U.S. patents: 6,362,067, 5,073,850, 6,385,060, 6,587,357, 6,469,484, 6,940,320, 5,862,045. There may be other patents pending. ON Semiconductor and are ...

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