L6732_08 datasheet(15/37 Pages) STMICROELECTRONICS

Teilenummer	L6732

Bauteilbeschribung	Adjustable step-down controller with synchronous rectification

PDF	37 Pages

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Hersteller	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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L6732

Device description

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The L6732 can sink or source current after the soft-start phase (see Figure 9.). If an over

current is detected during the soft-start phase, the device provides a constant-current-

protection. In this way, in case of short soft-start time and/or small inductor value and/or high

output capacitors value and so, in case of high ripple current during the soft-start, the

converter can start in any case, limiting the current (see section 4.6 monitoring and

protections) but not entering in HICCUP mode.

During normal operation, if any under-voltage is detected on one of the two supplies, the SS

pin is internally shorted to GND and so the SS capacitor is rapidly discharged.

Figure 8.

Start-up with pre-bias

Figure 9.

Inductor current during and after soft-start

VSS

VOUT

LGate

VOUT

VSS

VCC

L6732 Datenblatt(PDF) 15 Page - STMicroelectronics