［AP2152］

MS1348-E-00

7

2012/05

*1.

Normally, when 4.25V is applied to VIN for shorter than 100μs, while the PWM pin is kept at a low

level, the IC will be in the standby mode.

However, if 4.25V is applied to VIN for longer than 300μs, the current consumption of the IC is about

900μA. In order to get the IC into standby mode, after inputting a H level to the PWM pin for more than

36μs , a L level needs to be maintained for more than 50ms.

Figure 3. Power Supply Rising Time and Standby mode

Interface (AC Timing)

Value

Parameter

Symbol

MIN

TYP

MAX

Unit

Condition

PWM

15

30

μs

Before Startup

PWM Minimum High

Time 1

●

15

36

μs

Before Startup

PWM Minimum High

Time 2

●

5

7

μs

After Startup

Shutdown Time

●

20

30

50

ms

PWM Dimming Frequency

Range

0.1

20

kHz

SYNC

SYNC Input Frequency

Range

●

0.21

2.5

MHz

SYNC Input Duty

●

20

80

%

Serial Timing

SCLK Cycle

10

μs

SCLK Pulse Width

5

μs

SDATA Delay

3

μs

SCLK

SDATA

tSCKP

tSCKW

tSCKW

tSDTW

Figure 4. Serial Interface Wave Form

PWM

Standby mode

VIN

36µs or longer

4.2V

0

0

50ms or longer

approx 900µA

IDD

approx 5mA

approx 5µA

300µs or longer