NCP1560 Просмотр технического описания (PDF) - ON Semiconductor

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NCP1560

Full Featured Voltage Mode PWM Controller

ON Semiconductor 

NCP1560

Line Under/Overvoltage Shutdown

The NCP1560 incorporates a line under/overvoltage

shutdown (UV/OV) circuit. The undervoltage (UV)

threshold is 1.52 V and the overvoltage threshold (OV) is

3.61 V, for a ratio of 1:2.4.

The UV/OV circuit can be biased using an external

resistor divider from the input line. The resistor divider must

be sized to enable the controller once Vin is within the

required operating range. If the UV or OV threshold is

reached, the soft−start capacitor is discharged, and the

outputs are immediately disabled with no overlap delay as

shown in Figure 30. Also, if an UV condition is detected, the

5.0 V Reference Supply is disabled.

VAUX(on)

VAUX

VAUX(off)

0V

VOV

UV/OV Voltage

VUV

0V

UV or OV Fault

Propagation delay to

outputs (tUV or tOV)

OUT2

0V

OUT1

0V

Figure 30. UV/OV Fault Timing Diagram

http://onsemi.com

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