ZL6100ALAF datasheet(13/34 Pages) RENESAS

13 / 34 page

ZL6100

FN6876 Rev 3.00

Page 13 of 34

August 29, 2012

DOSA VOLTAGE TRIM MODE

On a DOSA module, the VOUT setting follows Equation 4:

To maintain DOSA compatibility, the same scheme is used as

with a POLA module except the 10k

 resistor is replaced with

a 8.66k resistor as shown in Figure 11.

The DOSA mode VOUT settings are listed in Table 5.

Start-up Procedure

The ZL6100 follows a specific internal start-up procedure after

power is applied to the VDD pin. Table 6 describes the start-up

sequence.

If the device is to be synchronized to an external clock source,

the clock frequency must be stable prior to asserting the EN pin.

The device requires approximately 5ms to 10ms to check for

specific values stored in its internal memory. If the user has

stored values in memory, those values will be loaded. The

device will then check the status of all multi-mode pins and load

the values associated with the pin settings.

Once this process is completed, the device is ready to accept

commands via the I2C/SMBus interface and the device is

ready to be enabled. Once enabled, the device requires

approximately 2ms before its output voltage may be allowed to

start its ramp-up process. If a soft-start delay period less than

2ms has been configured (using DLY pins or PMBus

commands), the device will default to a 2ms delay period. If a

delay period greater than 2ms is configured, the device will

wait for the configured delay period prior to starting to ramp its

output.

After the delay period has expired, the output will begin to ramp

towards its target voltage according to the pre-configured soft-

start ramp time that has been set using the SS pin. It should be

noted that if the EN pin is tied to VDD, the device will still

require approx 5ms to 10ms before the output can begin its

ramp-up as described in Table 6.

TABLE 4. POLA MODE VOUT SETTINGS (R0 = 110k, R1 = RSET +

10k)

VOUT

(V)

RSET

IN SERIES WITH

10k



RESISTOR

)

VOUT

(V)

RSET

IN SERIES

WITH 10k



RESISTOR

)

0.700

162

0.991

21.5

0.752

110

1.000

19.6

0.758

100

1.100

16.2

0.765

90.9

1.158

13.3

0.772

82.5

1.200

12.1

0.790

75.0

1.250

9.09

0.800

56.2

1.500

7.50

0.821

51.1

1.669

5.6

0.834

46.4

1.800

4.64

0.848

42.2

2.295

2.87

0.880

34.8

2.506

2.37

0.899

31.6

3.300

1.21

0.919

28.7

5.000

0.162

0.965

23.7

RSET

6900

VOUT 0.69V

–

----------------------------------

(EQ. 4)

FIGURE 11. RSET ON A DOSA MODULE

ZL6100

8.66 k

DOSA

MODULE

RSET

110 k



TABLE 5. DOSA MODE VOUT SETTINGS (R0 = 110k, R1 = RSET +

8.66k)

VOUT

(V)

RSET

IN SERIES

WITH 8.66k



RESISTOR

)

VOUT

(V)

RSET

IN SERIES

WITH 8.66k



RESISTOR

)

0.700

162

0.991

22.6

0.752

113

1.000

21.0

0.758

100

1.100

17.8

0.765

90.9

1.158

14.7

0.772

82.5

1.200

13.3

0.790

75.0

1.250

10.5

0.800

57.6

1.500

8.87

0.821

52.3

1.669

6.98

0.834

47.5

1.800

6.04

0.848

43.2

2.295

4.32

0.880

36.5

2.506

3.74

0.899

33.2

3.300

2.61

0.919

30.1

5.000

1.50

0.965

25.5

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