NCP1207P PDF даташит
Спецификация NCP1207P изготовлена «ON» и имеет функцию, называемую «PWM Current-Mode Controller for Free Running Quasi-Resonant Operation». |
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Детали детали
Номер произв | NCP1207P |
Описание | PWM Current-Mode Controller for Free Running Quasi-Resonant Operation |
Производители | ON |
логотип |
18 Pages
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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 circuitry (OCP) makes the final
design rugged and reliable.
Features
• 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
• Pb−Free Package is Available
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.)
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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
†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, 2004
June, 2004 − Rev. 6
1
Publication Order Number:
NCP1207/D
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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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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
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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
Thermal Resistance, Junction−to−Air, SOIC version
Thermal Resistance, Junction−to−Air, PDIP version
Maximum Junction Temperature
Temperature Shutdown
RqJC
RqJA
RqJA
TJMAX
−
57 °C/W
178 °C/W
100 °C/W
150 °C
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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