L6910G Просмотр технического описания (PDF) - STMicroelectronics

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L6910G

ADJUSTABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATION

STMicroelectronics 

L6910G

avoided if the PHASE pin is over about 500mV. The lower mos is in any case turned-on after 200ns from the

high side turn-off.

The peak current is shown for both the upper (fig. 6) and the lower (fig. 7) driver at 5V and 12V. A 3.3nF capac-

itive load has been used in these measurements.

For the lower driver, the source peak current is 1.1A @ VCC = 12V and 500mA @ VCC = 5V, and the sink peak

current is 1.3A @ VCC = 12V and 500mA @ VCC = 5V.

Similarly, for the upper driver, the source peak current is 1.3A @ Vboot-Vphase = 12V and 600mA @ Vboot-

Vphase = 5V, and the sink peak current is 1.3A @ Vboot-Vphase =12V and 550mA @ Vboot-Vphase = 5V.

Figure 6. High Side Driver Peak Current. Vboot-Vphase = 12V (right) Vboot-Vphase = 5V (left)

CH1 = High Side Gate CH4 = Gate Current

Figure 7. Low Side Driver Peak Current. VCC = 12V (right) VCC = 5V (left)

CH1 = Low Side Gate CH4 = Gate Current

4.5 Monitoring and Protections

The output voltage is monitored by means of pin FB. If it is not within ±10% (typ.) of the programmed value, the

powergood output is forced low.

The device provides overvoltage protection, when the voltage sensed on pin FB reaches a value 17% (typ.)

greater than the reference the OSC pin is forced high (3V typ.) and the lower driver is turned on as long as the

over-voltage is detected.

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