NCP1207B:Current Mode PWM 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 micro s 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 micro s 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.
技术特性
- 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 NCP1207B,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
应用
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终端产品
- AC/DC adapters for notebook
- Offline battery chargers
封装图 PACKAGE DIMENSIONS
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订购信息 Ordering Information
| 产品 |
状况 |
Compliance |
具体说明 |
封装 |
MSL* |
容器 |
预算价格 (1千个数量的单价） |
| 类型 |
外形 |
类型 |
数量 |
| NCP1207BDR2G |
Active |
|
Current Mode PWM Controller for Free Running Quasi-Resonant Operation |
SOIC-8 |
751U |
1 |
Tape and Reel |
2500 |
$0.35 |
数据资料DataSheet下载
