FAN8040G3X 查看數據表（PDF） - Fairchild Semiconductor

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FAN8040G3X

4-Channel Motor Driver

Fairchild Semiconductor 

Application Information

1. Power Save Function

• Power save function is also performed at PS (pin20). The truth table is as follows:

VDD

SW (pin3)

PS (pin20)

Input

Function

Input

Function

L CAPA(pin25) OFF L Power Save ON

20

H CAPA(pin25) ON H Power Save OFF

FAN8040

PS CNTL

Bias Circuit

Figure 1. Truth table of Gain selection and Mute Function

• When the PS (pin 20) is hige level (above 2V), the bias circuit is enable. On the other hand, when the PS(pin20) is low level

(under 0.5V), the bias circuit is disabled.

• When the CAPA(pin3) is low level, the CAPA (pin25) is opened in Figure. 4.

2. TSD (Thermal Shutdown) Function

• When the chip temperature rises above 175°C, then the 4-channels BTL driver output circuit will be muted.

The TSD circuit has the hysteresis temperature of 25°C.

4. Balanced Transformerless(BTL) Driver (CH1, CH2 and CH3)

• CH1, CH2 and CH3 drive parts are composed of internal filter, V-I converter and output power amplifiers.

FWD

REV

PVCC

I1

F

S1

R1=100KΩ

INTERFACE

R

S2

C1=25㎊

A

I2

Buffer1

Buffer2

VREF

Figure 2. Schematic of BTL Driver (CH1, CH2 and CH3)

F

R

S1

S2

L

L

OFF OFF

L

H

OFF ON

H

L

ON OFF

H

H

ON ON

H : above 2.4 [V]

L : under 0.5 [V]

Table 1. Truth table of internal switches operation

OUT1

OUT2

9

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