zl2103 Intersil Corporation, zl2103 Datasheet - Page 15

• Manufacturer Part Number: zl2103
• Description: 3a Digital-dc Synchronous Step-down Dc/dc Converter
• Manufacturer: Intersil Corporation

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 I
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.
FIGURE 14. SS PIN RESISTOR CONNECTIONS
2
C/SMBus interface. When the SS delay time is
R
SS
15
ZL
ZL2103
(kΩ)
12.1
13.3
14.7
16.2
19.6
21.5
23.7
26.1
28.7
31.6
34.8
38.3
42.2
46.4
51.1
56.2
61.9
68.1
82.5
90.9
17.8
100
110
121
133
162
147
R
10
11
75
SS
TABLE 6. DELAY AND RAMP CONFIGURATION
DELAY
TIME
(ms)
10
20
10
20
10
20
10
20
10
20
10
20
10
20
10
20
10
20
10
20
5
5
5
5
5
5
5
5
5
5
RAMP
TIME
(ms)
10
10
20
10
20
5
2
5
2
5
UVLO
4.5
5.5
7.5
(V)
May 3, 2011
FN6966.5