FAN8037 데이터 시트보기 (PDF) - Fairchild Semiconductor

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FAN8037

5-Channel Motor Driver

Fairchild Semiconductor 

8. BOOTSTRAPPED OPERATION

• IC has two kinds of power supplies, the power supply , SVCC is for

predrivers and the other circuit blocks(SVCC). PVCC1 and PVCC2 are for

the power transistors.

• When SVCC=PVCCn (n=1,2), no bootstrapped operation occurs. Thus the

single-ended maximum output voltage is

SVCC – (VcesatQ3 + Vbe1) ≅ SVCC – 1V

• If larger output swing is requied, use the bootstrap function. When

SVCC > PVCCn + 1V

the bootsrap function is operated.

• In this mode, the single-ended maximum output voltage is

PVCCn – VcesatQ1 ≅ PVCCn – 0.5 ; Thus wide output dynamic range

can be obtained.

FAN8037 (KA3037)

SVCC PVCC

Q3

Q1

Vout

Q2

PreDriver

(PD)

Power TRs

16

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