IXD3235 datasheet(13/27 Pages) ZILOG

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Product Specification

IXD3235/36/37

PS034201-0515

PRELIMINARY

TYPICAL APPLICATION CIRCUITS

IXD3235/36/37 A, B, C, E, G

Series (Fixed Output Voltage)

IXD3235/36/37 D, F Series (Adjustable Output Voltage)

EXTERNAL COMPONENTS

fOSC

1.2 MHz

3.0 MHz

L, µH

4.7

1.5

CIN, µF

4.7

CL, µF

Setting Output Voltage

The IXD3235/36/37 D, F Series allows set output voltage externally by two resistors RFB1 and RFB2 as sown on

schematic diagram above.

Output voltage can be set starting from 0.9V. However, when input voltage (VIN) is lower than the set output

voltage, output voltage (VOUT) cannot be higher than the input voltage.

VOUT = 0.8 × (RFB1+RFB2)/RFB2

RFB1 + RFB2 < 1 MΩ.

The value of the phase compensation capacitor CFB is calculated by the follow equation

fZFB = 1/(2×π×CFB×RFB1),

where fZFB < 10 kHz. For optimization, fZFB can be adjusted in the range of 1 kHz to 20 kHz depending on the

inductance L and the load capacitance CL.

Example:

When RFB1 = 470 kΩ and RFB2 = 150 k, VOUT = 0.8 × (470 k+150 k) / 150 k = 3.3 V

VOUT, V

RFB1, kΩ

RFB2, kΩ

CFB, pF

VOUT, V

RFB1, kΩ

RFB2, kΩ

CFB, pF

0.9

100

820

150

2.5

510

240

100

1.2

150

300

100

3.0

330

120

150

1.5

130

150

220

3.3

470

150

100

1.8

300

240

150

4.0

120

470

IXD3235 Datasheet(PDF) 13 Page - Zilog, Inc.

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