制造商:ON
The NCP1251 is a highly integrated PWM controller capable of delivering a rugged and high performance offline power supply in a tiny TSOP-6 package. With a supply range up to 28 V, the controller hosts a jittered 65 kHz or 100 kHz switching circuitry operated in peak current mode control. When the power on the secondary side starts to decrease, the controller automatically folds back its switching frequency down to a minimum level of 26 kHz. As the power further goes down, the part enters skip cycle while limiting the peak current.
Over Power Protection (OPP) is a difficult exercise especially when no-load standby requirements drive the converter specifications. The ON proprietary integrated OPP lets you harness the maximum delivered power without affecting your standby performance simply via two external resistors. A latched Over Voltage Protection (OVP) is combined on the same pin. For ease of implementation, an auto-recovery OVP also monitors the Vcc line. These features offer an efficient protection in case of optocoupler failure or adverse open loop operation.
Finally, a timer-based short-circuit protection offers the best protection scheme, letting you precisely select the protection trip point irrespective of a loose coupling between the auxiliary and the power windings.
Non-dissipative internal and adjustable Over Power Protection (OPP)
Frequency Foldback down to 26 kHz and Skip-Cycle in light load conditions
Internal Ramp Compensation
Frequency jittering from full load to skip-cycle
Latch input for OVP and OTP implementations
Over Voltage Protection (OVP) monitoring on the Vcc pin
See NCP1250 for no Over Voltage Protection (OVP) on the Vcc pin
NCP1251电路图
NCP1251电路图
NCP1251 引脚图
NCP1251 封装图
型号 | 制造商 | 描述 | 购买 |
---|---|---|---|
NCP1251ASN65T1G | ON | Converter Offline Flyback Topology 65kHz 6-TSOP | 立即购买 |
NCP1251ASN100T1G | ON | IC PWM CTLR OCP AUTO | 立即购买 |
NCP1251CSN65T1G | ON | Converter Offline Flyback Topology 65kHz 6-TSOP | 立即购买 |
NCP1251BSN65T1G | ON | 离线电源的电流型PWM控制器 | 立即购买 |
NCP1251BSN100T1G | ON | IC PWM CTLR OCP AUTO | 立即购买 |
NCP1251FSN65T1G | - | - | 立即购买 |
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