CXA2534Q データシートの表示（PDF） - Sony Semiconductor

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CXA2534Q

4-Channel CD Motor Driver

Sony Semiconductor 

CXA2534Q

2. DC-to-DC Converter

a) VCC1 Voltage Setting

The VCC1 voltage can be adjusted by varying the two external resistors, R1 and R2. The formula for

VCC1 Voltage setting is:

R1R3

R2R4

+

VCC1 = 1.23 R1+R3

R2+R4

(V)

R2R4

R2+R4

where

R1 - External Resistor

R2 - External Resistor

R3 - 35 kΩ

R4 - 21 kΩ

CXA2534Q

VCC1

3

R1

R3

EI

43

R2

R4

1.23V

b) Short Circuit Protection

If the VCC1 falls below the designed voltage for a long time, it will be considered as a short circuit at the

VCC1. In this case, the IC will detect this prolong drop in VCC1 and turn off the IC.

When the VCC1 is below the designed voltage, the error amplifier will output an HIGH at its EO pin (pin

42). The High level at EO pin will cause the SPRT pin’s capacitor (pin 44) to charge up by a constant

current of 10 µA. Once the voltage is above 1.23 V (typical), the IC will turn off. The duration of the

short circuit can be varied by the SPRT pin’s capacitor.

1.23V

t=

× CSPRT

10µA

(sec)

—20—

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