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Details, datasheet, quote on part number:NCP1207DR2
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| Part: | NCP1207DR2 |
| Category: | Power Management => AC-DC Controllers/Converters => AC-DC Switching => Off-Line Controllers |
| Description: | Variable-frequency Quasi-resonant Flyback Current-mode Controller With 500V Maximum Startup, Frequency Foldback For Standby And no Auxiliary Winding, Package: Soic, Pins=8 |
| Company: | ON Semiconductor |
| Datasheet: | Download NCP1207DR2 datasheet File size : 198 kB |
| Request For quote: | Find where to buy NCP1207DR2
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Datasheet text preview:
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 Over-V ltage Protection (OVP). Once an OVP has been detected, the o IC permanently latches-off. Finally, the continuous feedback signal monitoring implemented with an over-current fault protection circuitry (OCP) makes the final design rugged and reliable.
Features http://onsemi.com MARKING DIAGRAMS
8 SO-8 D1, D2 SUFFIX CASE 751 1 8 DIP-8 N SUFFIX CASE 626 8 1 1207/P A WL, L YY, Y WW, W 1 = Device Code = Assembly Location = Wafer Lot = Year = Work Week 1207P AWL YYWW 1 1207 ALYW
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Free-Running Borderline/Critical Mode Quasi-Resonant Operation Current-Mode with Adjustable Skip-Cycle Capability No Auxiliary Winding VCC Operation Auto-Recovery Over Current Protection Latching Over Voltage Protection External Latch Triggering, e.g. Via Over-Temperature 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 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.)
PIN CONNECTIONS
Dmg FB CS Gnd 1 2 3 4 (Top View) 8 7 6 5 HV NC VCC Drv
ORDERING INFORMATION
Device NCP1207DR2 NCP1207P Package SOIC-8 PDIP-8 Shipping 2500/Tape & Reel 50 Units/Tube
Typical Applications
ฉ Semiconductor Components Industries, LLC, 2003
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August, 2003 - Rev. 2
Publication Order Number: NCP1207/D
NCP1207
* 12 V @ 1.0 A + + 1 Ground Dmg 2 FB NC 7 3 CS VCC 6 4 Gnd Drv 5 Universal Network HV 8
+
Y1 Type *Please refer to the application information section
Figure 1. Typical Application
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PIN FUNCTION DESCRIPTION
Pin No. 1 2 Pin Name Demag FB Function Description Core reset detection and OVP Sets the peak current setpoint 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. 3 CS Current sense input and skip cycle level selection The IC ground Driving pulses Supplies the IC - 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. 4 5 6 7 8 Gnd Drv VCC NC HV
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NCP1207
4.5 ms Delay Demag OVP 7.0 mA + - + VCC - + PON + 5.0 V /1.44 8.0 ms Blanking S S* R* R Q 12 V, 10 V, 5.3 V (fault) Q VCC Driver: src = 20 sink = 10 Drv 4.2 V Re s d - + + 50 mV Ri n t 10 V Demag
HV
To Internal Supply Gnd
Fault Mngt.
+ -
Soft-Start = 1 ms
/3
FB
1.0 V Overload? Timeout Reset
200 mA when Drv is OFF 380 ns L.E.B. CS
5.0 ms Timeout *S and R are level triggered whereas S is edge triggered. R has priority over the other inputs.
Demag
Figure 2. Internal Circuit Architecture
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MAXIMUM RATINGS
Rating Symbol Value 16 Units V V Power Supply Voltage VCC, Drv - - Idem R J C R J A R J A TJMAX - - - - - VHVMAX VHVMIN Maximum Voltage on all other pins except Pin 8 (HV), Pin 6 (VCC) Pin 5 (Drv) and Pin 1 (Demag) Maximum Current into all pins except VCC (6), HV (8) and Demag (1) when 10 V ESD diodes are activated Maximum Current in Pin 1 Thermal Resistance, Junction-to-Case Thermal Resistance, Junction-to-Air, SOIC version Thermal Resistance, Junction-to-Air, DIP8 version Maximum Junction Temperature Temperature Shutdown Hysteresis in Shutdown Storage Temperature Range ESD Capability, HBM Model (All pins except HV) ESD Capability, Machine Model Maximum Voltage on Pin 8 (HV), Pin 6 (VCC) decoupled to ground with 10 mF Minimum Voltage on Pin 8 (HV), Pin 6 (VCC) decoupled to ground with 10 mF -0.3 to 10 5.0 +3.0/-2.0 57 178 100 150 155 30 -60 to +150 2.0 200 500 40 mA mA ฐC/W ฐC/W ฐC/W ฐC ฐC ฐC ฐC kV V V V
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