RT9602 데이터 시트보기 (PDF) - Richtek Technology

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RT9602

Dual Channel Synchronous-Rectified Buck MOSFET Driver

Richtek Technology 

RT9602

VVcc >

PPEASE

>

lLGATE >

lPWM1 >

Time (25ms)

Figure 9. High Side Direct Short

Referring to Figure 7, when VCC exceeds 1.5V, RT9602

turns on the LGATE to clamp the Phase through the low

side MOSFET. During the turn-on of the low side MOSFET,

the current of ATX 12V is limited at 25A although the

maximum current of ATX 12V listed on the case of ATX is

15A. After the ATX 12V shuts down, the VCC falls slowly.

Please note that the trigger point of RT9602 is at 1.5V

VCC, and the clamped value of phase is at about 2.4V.

Next, reference to Figure 8, it is obvious that since the

Phase voltage increases during the power-on, the VCORE

increases correspondingly, but is gradually decreased as

LGATE and VCC decrease. In Figure 9, during the turn-on

of the low side MOSFET, the VCC is much less than 12V,

thus the RT9241A/B keeps the PWM signal at high

impedance state.

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DS9602-08 March 2007

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