Current-Mode Controller. NCP1207 Datasheet

NCP1207 Controller. Datasheet pdf. Equivalent


ON Semiconductor NCP1207
NCP1207
PWM Current−Mode
Controller for Free Running
Quasi−Resonant Operation
The NCP1207 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. An internal 8.0 ms timer prevents
the free−run frequency to exceed 100 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.
The Dynamic Self−Supply (DSS) drastically simplifies the
transformer design in avoiding the use of an auxiliary winding to supply
the NCP1207. 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 (OCP) circuitry makes the final design
rugged and reliable.
Features
Pb−Free Packages are Available*
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
Internal 1.0 ms Soft−Start
Internal 8.0 ms Minimum TOFF
Adjustable Skip Level
Internal Temperature Shutdown
Direct Optocoupler Connection
SPICE Models Available for TRANsient Analysis
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.)
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2004
October, 2004 − Rev. 8
1
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8
1
8
1
SOIC−8
D1, D2 SUFFIX
CASE 751
MARKING
DIAGRAMS
8
1207
ALYW
1
PDIP−8
N SUFFIX
CASE 626
8
1
1207P
AWL
YYWW
1207/P = Device Code
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
PIN CONNECTIONS
DMG 1
FB 2
CS 3
GND 4
8 HV
7 NC
6 VCC
5 Drv
(Top View)
ORDERING INFORMATION
Device
Package
Shipping
NCP1207DR2
SOIC−8 2500/Tape & Reel
NCP1207DR2G SOIC−8 2500/Tape & Reel
(Pb−Free)
NCP1207P
PDIP−8
50 Units/Tube
NCP1207PG
PDIP−8
(Pb−Free)
50 Units/Tube
†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.
Publication Order Number:
NCP1207/D


NCP1207 Datasheet
Recommendation NCP1207 Datasheet
Part NCP1207
Description PWM Current-Mode Controller
Feature NCP1207; NCP1207 PWM Current−Mode Controller for Free Running Quasi−Resonant Operation The NCP1207 combines .
Manufacture ON Semiconductor
Datasheet
Download NCP1207 Datasheet




ON Semiconductor NCP1207
NCP1207
Universal Network
+ OVP and
NCP1207
Demag
18
27
36
45
*
+
Vout
+
GND
*Please refer to the application information section
Figure 1. Typical Application
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁPIN FUNCTION DESCRIPTION
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁPinNo. PinName
Function
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ1
Demag
Core reset detection and OVP
Description
The auxiliary FLYBACK signal ensures discontinuous operation and
offers a fixed overvoltage detection level of 7.2 V.
2 FB Sets the peak current setpoint 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.
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
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.
Connected to the high−voltage rail, this pin injects a constant current into
the VCC bulk capacitor.
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ON Semiconductor NCP1207
NCP1207
HV
7.0
mA
VCC
PON
+−
+
12 V, 10 V,
5.3 V (fault)
4.5 ms
Delay
OVP
Demag
+
5.0 V
/1.44
−+
8.0 ms
Blanking
SQ
S*
R* R Q
+
+
50 mV
Rint
Resd
10 V
Demag
VCC
Driver: src = 20
sink = 10
Drv
4.2 V
GND
To Internal
Supply
Fault
Mngt.
*S and R are level triggered whereas S is edge
triggered. R has priority over the other inputs.
Overload?
Soft−Start = 1 ms
+ /3
1.0 V 200 mA
when Drv
is OFF
5.0 ms
Timeout
Timeout
Reset
380 ns
L.E.B.
Demag
FB
CS
Figure 2. Internal Circuit Architecture
ÁÁÁÁÁÁMPoAwÁÁÁXeIrMSÁÁÁUupMpÁÁÁlyRVAoTÁÁÁltIaNgGeÁÁÁS ÁÁÁÁÁÁÁÁÁRÁÁÁatinÁÁÁg ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁVSCyÁÁCÁm,bDoÁÁrÁvl ÁÁÁÁÁÁÁÁÁVa1ÁÁl6Áue ÁÁÁÁÁÁÁÁÁUÁÁnÁVitsÁÁÁ
Maximum Voltage on all other pins except Pin 8 (HV), Pin 6 (VCC) Pin 5 (Drv) and
Pin 1 (Demag)
−0.3 to 10
V
Maximum Current into all pins except VCC (6), HV (8) and Demag (1) when 10 V
ESD diodes are activated
5.0 mA
Maximum Current in Pin 1
Idem
+3.0/−2.0
mA
Thermal Resistance, Junction−to−Case
RqJC
57 °C/W
Thermal Resistance, Junction−to−Air, SOIC version
RqJA
178 °C/W
Thermal Resistance, Junction−to−Air, PDIP version
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁOperating Junction Temperature
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁMaximum Junction Temperature
RqJA
TJ
TJMAX
100
−40 to +125
150
°C/W
°C
°C
Temperature Shutdown
− 155 °C
Hysteresis in Shutdown
− 30 °C
Storage Temperature Range
−60 to +150
°C
ESD Capability, HBM Model (All pins except HV)
− 2.0 kV
ESD Capability, Machine Model
− 200 V
Maximum Voltage on Pin 8 (HV), Pin 6 (VCC) decoupled to ground with 10 mF
VHVMAX
500
V
Minimum Voltage on Pin 8 (HV), Pin 6 (VCC) decoupled to ground with 10 mF
VHVMIN
40
V
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
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