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  ON Semiconductor Electronic Components Datasheet  

NCP1207A Datasheet

PWM Current-Mode Controller

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NCP1207A pdf
NCP1207A, NCP1207B
PWM Current- Mode
Controller for Free Running
Quasi--Resonant Operation
The NCP1207A/B combines a true current mode modulator and a
demagnetization detector to ensure full borderline/critical Conduction
Mode in any load/line conditions and minimum drain voltage switching
(Quasi--Resonant operation). Due to its inherent skip cycle capability,
the controller enters burst mode as soon as the power demand falls
below a predetermined level. As this happens at low peak current, no
audible noise can be heard. For the NCP1207A, an internal 8.0 ms timer
prevents the free--run frequency to exceed 125 kHz (therefore below the
150 kHz CISPR--22 EMI starting limit), while the skip adjustment
capability lets the user select the frequency at which the burst foldback
takes place. For the NCP1207B, the internal timer duration is reduced to
4.5 ms to allow operation at higher frequencies (up to 200 kHz).
The Dynamic Self--Supply (DSS) drastically simplifies the
transformer design in avoiding the use of an auxiliary winding to
supply the NCP1207A/B. This feature is particularly useful in
applications where the output voltage varies during operation (e.g.
battery chargers). Due to its high--voltage technology, the IC is
directly connected to the high--voltage DC rail. As a result, the
short--circuit trip point is not dependent upon any VCC auxiliary level.
The transformer core reset detection is done through an auxiliary
winding which, brought via a dedicated pin, also enables fast
Overvoltage Protection (OVP). Once an OVP has been detected, the
IC permanently latches off.
Finally, the continuous feedback signal monitoring implemented
with an overcurrent fault protection circuitry (OCP) makes the final
design rugged and reliable.
Free--Running Borderline/Critical Mode Quasi--Resonant Operation
Current--Mode with Adjustable Skip--Cycle Capability
No Auxiliary Winding VCC Operation
Auto--Recovery Overcurrent Protection
Latching Overvoltage Protection
External Latch Triggering, e.g. Via Overtemperature Signal
500 mA Peak Current Source/Sink Capability
Undervoltage Lockout for VCC Below 10 V
Internal 1.0 ms Soft--Start
Internal 8.0 ms Minimum TOFF for NCP1207A,
4.5 ms Minimum TOFF for NCP1207B
Adjustable Skip Level
Internal Temperature Shutdown
Direct Optocoupler Connection
SPICE Models Available for TRANsient Analysis
These are Pb--Free and Halide--Free Devices
Typical Applications
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.)
http://onsemi.com
8
1
8
1
SOIC--8
D SUFFIX
CASE 751
SOIC--7
D SUFFIX
CASE 751U
MARKING
DIAGRAM
8
1207A
ALYW
G
1
8
1207B
ALYW
G
1
8
8
1
PDIP--8
P SUFFIX
CASE 626
1207AP
AWL
YYWWG
1
1207A/B/AP = Device Code
A = Assembly Location
L, WL
= Wafer Lot
Y, YY
= Year
W, WW
= Work Week
G or G
= Pb--Free Package
PIN CONNECTIONS
Dmg 1
FB 2
CS 3
GND 4
8 HV
7 NC
6 VCC
5 Drv
ORDERING INFORMATION
Device
NCP1207ADR2G
Package
SOIC--8
(Pb--Free)
Shipping
2500/Tape & Reel
NCP1207APG
PDIP--8
(Pb--Free)
50 Units / Rail
NCP1207BDR2G 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 Specifications
Brochure, BRD8011/D.
Semiconductor Components Industries, LLC, 2010
December, 2010 -- Rev. 11
1
Publication Order Number:
NCP1207A/D


  ON Semiconductor Electronic Components Datasheet  

NCP1207A Datasheet

PWM Current-Mode Controller

No Preview Available !

NCP1207A pdf
NCP1207A, NCP1207B
Universal Network
*
+ OVP and NCP1207A/B
Demag
18
27
36
45
+
*Please refer to the application information section
Figure 1. Typical Application
Vout
+
GND
PIN FUNCTION DESCRIPTION
Pin Pin Name
1 Demag
Function
Core reset detection and OVP
2 FB Sets the peak current setpoint
3 CS Current sense input and skip
cycle level selection
4
GND
The IC ground
5 Drv Driving pulses
6 VCC Supplies the IC
7 NC
--
8 HV High--voltage pin
Description
The auxiliary FLYBACK signal ensures discontinuous operation and offers a fixed
overvoltage detection level of 7.2 V.
By connecting an Optocoupler to this pin, the peak current setpoint is adjusted
accordingly to the output power demand. By bringing this pin below the internal
skip level, device shuts off.
This pin senses the primary current and routes it to the internal comparator via an
L.E.B. By inserting a resistor in series with the pin, you control the level at which
the skip operation takes place.
--
The driver’s output to an external MOSFET.
This pin is connected to an external bulk capacitor of typically 10 mF.
This unconnected pin ensures adequate creepage distance. (No pin on
NCP1207B)
Connected to the high--voltage rail, this pin injects a constant current into the VCC
bulk capacitor.
http://onsemi.com
2


Part Number NCP1207A
Description PWM Current-Mode Controller
Maker ON Semiconductor
Total Page 17 Pages
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