STA517B データシートの表示（PDF） - STMicroelectronics

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STA517B

60 V 6 A quad power half bridge

STMicroelectronics 

Power supply and control sequencing

4

Power supply and control sequencing

STA517B

To guarantee correct operation and reliability, a correct turn on/off sequence must be

followed. Figure 3 shows the correct power on sequence.

Figure 3. Correct power-on sequence

V

Vcc

VL

Vcc > VL

t

PWRDN

t

IN

t

Vcc must turn on before VL in order to prevent uncontrolled current flowing through an

internal protection diode connected between VL (logic supply) and Vcc (high power supply).

Failure to do so could result in damage to the device.

PWRDN must be released after VL is switched on. An input signal can then be sent to the

power stage.

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