参数资料
| 型号： | NCP1288BD65R2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 24/39页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBACK PWM 7SOIC |
| 标准包装： | 1 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 70kHz |
| 占空比： | 85% |
| 电源电压： | 10.5 V ~ 28 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽）7 引线 |
| 包装： | 标准包装 |
| 其它名称： | NCP1288BD65R2GOSDKR |
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NCP1288
Each time the controller is starting, i.e. the controller was
off and starts, or restarts, when V CC reaches V CC(on) , a
soft ? start is applied: the current sense setpoint is linearly
increased from 0 (the minimum level can be higher than 0
because of the LEB and propagation delay) until it reaches
V ILIM (after a duration of t SSTART ), or until the FB loop
imposes a setpoint lower than the one imposed by the
soft ? start (the 2 comparators outputs are OR’ed).
V FB
V FB(fault)
Time
Soft-start ramp
V ILIM
V FB takes
over soft-start
CS Setpoint
V ILIMI
Figure 49. Soft ? Start
t SSTART
Time
Time
Under some conditions, like a winding short ? circuit for
instance, not all the energy stored during the on time is
transferred to the output during the off time, even if the on
time duration is at its minimum (imposed by the propagation
delay of the detector added to the LEB duration). As a result,
the current sense voltage keeps on increasing above V ILIM ,
because the controller is blind during the LEB blanking
time. Dangerously high current can grow in the system if
nothing is done to stop the controller. In order to protect
against this, an additional comparator is included, that
senses when V CS reaches V CS(stop) ( = 1.5 x V ILIM ). As soon
as this comparator toggles, the controller immediately enters
the protection mode (latched or autorecovery according to
the chosen option).
http://onsemi.com
24
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