LB1848MC

No.A2036-5/6

(Cautions)

Pay attention to following two points in an application where the capacitor to GND is connected to the SOF pin:

(1) Sudden startup of VCC power supply causes charging of the capacitor from the IC inside via the SOF pin at startup.

During charging, the state equivalent to the one with the ENA input at “H” occurs, causing output of the corresponding

logic to the output pin, which may result in driving of the load. (The output time period is dependent on the capacity

of capacitor; about 2 ms for 0.01

μF.)

(2) To transfer from the drive mode to the standby mode by changing the ENA input from “H” to “L”, the capacitor is

charged from the IC inside via the SOF pin as in the case of above (1). During this charge period, the ENA input keeps

the “H” condition in IC. By changing IN1/IN2 input at this time point, the output can be changed. (The time period is

equal to that of (1) above.)

60kW

Q1

R1

R2

Q2

VCC

ENA

SOF

GND

Drive circuit

External capacitor

[SOF pin internal equivalent circuit diagram]

8

6

24

7

59

13

0

0

10

20

30

40

50

8

6

24

7

59

13

0

IIN -- VIN

0

40

80

120

160

200

240

280

VCC=VIN, IN1 / 2 / 3 / 4=H / L / H / L

VCC=5V

0

0.2

0.4

0.6

0.8

1.0

0.7

0.5

0.1

0.3

0.6

0.4

0

0.2

VOUT -- IOUT

VCC=VIN=4.0V

ICC - VCC Characterstics

Power-supply voltage, VCC - V

Input voltage, VIN - V

Input current, IOUT - A