ZL2103 datasheet(15/28 Pages) RENESAS

15 / 28 page

ZL2103

FN6966 Rev 5.00

Page 15 of 28

May 3, 2011

appropriate resistor value from Table 6. The value of this resistor

is measured upon start-up or Restore and will not change if the

resistor is varied after power has been applied to the ZL2103

(see Figure 14).

The soft-start delay and ramp times can also be set to custom

values via the I2C/SMBus interface. When the SS delay time is

set to 0ms, the device will begin its ramp-up after the internal

circuitry has initialized (~2ms). When the soft-start ramp period

is set to 0ms, the output will ramp up as quickly as the output

load capacitance and loop settings will allow. It is generally

recommended to set the soft-start ramp to a value greater than

500µs to prevent inadvertent fault conditions due to excessive

inrush current.

RSS

FIGURE 14. SS PIN RESISTOR CONNECTIONS

TABLE 6. DELAY AND RAMP CONFIGURATION

RSS

)

DELAY

TIME

(ms)

RAMP

TIME

(ms)

UVLO

(V)

4.5

12.1

13.3

14.7

16.2

17.8

5.5

19.6

21.5

23.7

26.1

28.7

31.6

34.8

38.3

42.2

46.4

51.1

56.2

7.5

61.9

68.1

82.5

90.9

100

110

121

133

147

162

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