FAN8038B 데이터 시트보기 (PDF) - Fairchild Semiconductor

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FAN8038B

4-Channel Motor Drive IC

Fairchild Semiconductor 

FAN8038B(KA3038)

• Short Circuit Protection function when GND and is short, ERRI become LOW and ERRO HIGH and it makes capacitor

charging. fanally AMP3 is OFF.(figure 5)

SVCC

1

30K

30.5K

AMP1

1.267V

DEDSET

BATT

AMP4

AMP5

AMP3

SCP

1.267V

COSC

Figure 3. DC/DC Converter Control Circuit

Switching off time depen on a capacitor of the SCP . and the equation is as follow.

t

=

CSCP

×

-V----T----H--

ISCP

(VTH = 1.25V, ISPRT = 10µA)

• Max Duty can be controlled resistor. the equation is as follow.

t = CDEDSET × R

(R = 65KΩ)

• Capacitor of the SCP terminal can control disable switiching time and it can be calculated by as follow equation.

t

=

CSCP

×

---V----T---H-----

ISTOP

(VTH = 1.25V, IOFF = 20µA)

• Over Voltage Protection BATT Voltage is over 9.7V charging SCP terminal Capacitor, it reach to VTH SW terminal signal

is OFF the equation is as follow

t

=

CSCP

×

V-----T---H--

IHV

(VTH = 1.25V, IHV = 20µA)

• If Output Voltage of RSTOUT Circuit DC/DC Conver is over than 90%, RSTOUT terminal turn to HIGH and Hysteresis is

50mV. and RSTOUT stste is ON.

7. Empty Detecting Circuit.

EMPSET

Detect Voltage

LOW

2.2V

HIGH-Z

1.8V

Hysteresis

50mV

50mV

Mode

Battery Mode

Adapter Mode

8. Battery Charging Circuit

• the battery charger circuit is separated from any other block .

• TSD operate at 150°C. Hysteresis is 30°C

12

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