FAN8038C 데이터 시트보기 (PDF) - Fairchild Semiconductor

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FAN8038C

4-Channel Motor Drive IC

Fairchild Semiconductor 

FAN8038C

• The time until switching-off is set by the capacitor, CSCP, and the equation is as follows:

6-4. Soft Start Function

tSCP

=

CSCP ×VSCP

iSCP

[sec]

where,VSCP = 1.25[V ], iSCP = 10[uA]

• The soft start function operates when a capacitor is connected between DEDSET(pin4) and GND. Also, the maximum duty

cab be varied by connecting a resistor to pin4.

tSOFT = CDEDSET × R

Where, R = 65[KΩ]

7. POWER OFF FUNCTION

• When low level is applied to STOP (pin40), SCP (pin8) is charged, and when the voltage reaches 1.25V (typical), the PWM

comparator output, BDSW(pin5), is shwitch-off.

• The time until switching-off is set by the capacitor, CSCP, and the equation is as follows:

tOFF

=

CSCP ×VTH

iOFF

[sec]

Where,VTH = 1.25[V ], iOFF = 20[uA]

•

8. BATTERY CHARGER AND MONITORING FUNCTION

8-1. Set to Battey Charging Current

• The power supply for the charging circuit is ADPVCC (pin41), and battery charger circuit is separated from any other

block. The resistance between CHGSET (pin33) and GND sets the charging current, iCHG.

• This current, iCHG, is drawn from EMPSET (pin42).

• The thermal shutdown circuit is provided, and when the chip temperature rise up to about 150°C the charging current, iCHG,

is cut-off and it has the temperature hysteresis of about 30°C.

8-2. Over Voltage Protection

• When the voltage applied to the OVP (pin1) reaches 9.7V, SCP (pin8) is charged, and when the voltage reaches 1.25V

(typical), the PWM comparator output, BDSW(pin5), is shwitch-off.

• The time until switching-off is set by the capacitor, CSCP, and the equation is as follows:

•

tOVP

=

CSCP ×VTH

iOVP

[sec]

Where,VTH = 1.25[V ],iOVP = 20[uA]

•

8-3. Empty Detecting Circuit

• when the voltage applied to the OVP (pin1) falls below the detector voltage, EMP (pin35) goes from high level to low level

(open collector output). The detector voltage has 50mV of hysteresis to prevent output chattering.

• EMPSEL (pin42) to switch the detection voltage as shown below.

•

EMPSET

Detect Voltage

Hysteresis

Mode

LOW

2.2V

50mV

Battery Mode

HIGH-Z

1.8V

50mV

Adapter Mode

12

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