ZL2004 datasheet(13/42 Pages) RENESAS

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ZL2004

FN6846 Rev. 3.00

Page 13 of 42

February 15, 2011

Table 7. Resistors for Setting Output Voltage

Index

R0 or R1

Index

R0 or R1

10 k

34.8 k

11 k

38.3 k

12.1 k

42.2 k

13.3 k

46.4 k

14.7 k

51.1 k

16.2 k

56.2 k

17.8 k

61.9 k

19.6 k

68.1 k

21.5 k

75 k

23.7 k

82.5 k

26.1 k

90.9 k

28.7 k

100 k

31.6 k

Example from Figure 8: For VOUT = 1.33 V,

Index1 = 4 x 1.33 V = 5.32;

From Table 7, R1 = 16.2 kΩ

Index0 = (100 x 1.33 V) – (25 x 5) = 8;

From Table 7, R0 = 21.5 kΩ

The output voltage may also be set to any value

between 0.6 V and 3.6 V using the I

2C interface. See

Application Note AN33 for details.

VIN

VOUT

1.33V

PWMH

PWML

Driver

MOSFET

21.5 k

16.2 k

Figure 8. Output Voltage Resistor Setting Example

POLA Voltage Trim Mode

The output voltage mapping can be changed to match

the voltage setting equations for POLA (Point of Load

Alliance)

and

DOSA

(Distributed-power

Open

Standards Alliance) standard modules.

The standard method for adjusting the output voltage

for a POLA module is defined by the following

equation:







out

SET

The resistor, RSET, is external to the POLA module. See

Figure 9.

1.43kΩ

Rset

0.69V

10kΩ

VOUT

POLA Module

Figure 9. Output Voltage Setting on POLA Module

To stay compatible with this existing method for

adjusting the output voltage and to keep the same

external RSET resistor when using the ZL2004, the

module manufacturer should add a 10 kΩ resistor on

the module as shown in Figure 10. Now, the same RSET

used for an analog POLA module will provide the

same output voltage when using a digital POLA

module based on the ZL2004.

ZL2004

10 k

POLA

MODULE

Rset

110 k

Figure 10. RSET on a POLA Module

ZL2004 Datasheet(PDF) 13 Page - Renesas Technology Corp

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