MAX1802EVKIT データシートの表示（PDF） - Maxim Integrated

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MAX1802EVKIT

MAX1802 Evaluation Kit for Digital Still Cameras

Maxim Integrated 

MAX1802 Evaluation Kit for

Digital Still Cameras

Table 1. Output Voltage and Current

Capability

LABEL

MAIN

CORE

OUT1A

OUT1B

OUT1C

OUT2A

OUT2B

OUT2C

OUT3

OUT4

VOLTAGE/CURRENT

+3.3V at 1A

+1.8V at 400mA

+13.5V at 10mA

+5V at 50mA

-9V at 10mA

+13.5V at 10mA

+5V at 50mA

-19.0V at 10mA

+7V at 100mA

+12V at 100mA

OUT1_ (Flyback Outputs)

The voltages at OUT1_ are typical of CCD bias voltages.

The output voltages are +13.5V/10mA, +5V/50mA, and

-9V/10mA. These voltages are generated through a cus-

tom flyback transformer. OUT1B (+5V) is used to regu-

late the flyback circuit. The other output voltages

(+13.5V and -9V) are controlled by the turns-ratio of the

flyback transformer. If the +13.5V and -9V outputs are

not loaded at the fixed 10mA load, then the output volt-

age will change from the nominal loaded output voltage.

Loads are included on the MAX1802 EV kit by shorting

jumpers JU7 through JU12. If external loads are used,

remove these jumpers to disable the built-in loads.

To enable OUT1_, place jumper JU6 to the ON position.

To disable OUT1_, place jumper JU6 to the OFF posi-

tion. To enable and disable the output voltages using an

external signal, see the Logic Control of the Output

Voltages section.

If a different set of output voltages is required, see the

Setting the Flyback Circuit Voltages section.

OUT2_ (Flyback Outputs)

The voltages at OUT2_ are typical of LCD bias volt-

ages. The output voltages are +13.5V/10mA,

+5V/50mA, and -19V/10mA. These voltages are gener-

ated through a custom flyback transformer. OUT2B

(+5V) is used to regulate the flyback circuit. The other

output voltages (+13.5V and -19V) are controlled by the

turns-ratio of the flyback transformer. If the +13.5V and

-19V outputs are not loaded at the fixed 10mA load,

then the output voltage will change from the nominal

loaded output voltage. Loads are included on the

MAX1802 EV kit by shorting jumpers JU7 through

JU12. If external loads are used, disable the built-in

loads by removing these jumpers.

To enable OUT2_, place jumper JU2 to the ON posi-

tion. To disable OUT2_, place jumper JU2 to the OFF

position. To enable and disable the output voltages

using an external signal, see the Logic Control of the

Output Voltages section.

If a different set of output voltages is required, see the

Setting the Flyback Circuit Voltages section.

OUT3

The voltage at OUT3 is typical of that required by a

CCFL backlight inverter. To enable OUT3, place jumper

JU3 to the ON position. Place the external load

between OUT3 and GND. To change the output voltage

of OUT3, see the Setting the Step-Up Output Voltage

section. OUT3 is configured for a 7V output. For input

voltages greater than 7V, the output will approximately

track the input.

OUT3 can be configured to drive a white LED backlight

instead of a CCFL backlight.

OUT4

The voltage at OUT4 is a general-purpose +12V output

that can supply up to 100mA. To enable OUT4, place

jumper JU1 to the ON position. Place the external load

between OUT4 and GND. To change the output voltage

of OUT4, see Setting the Step-Up Output Voltage sec-

tion.

Customizing the MAX1802 EV Kit

Setting the Main Output Voltage

MAIN is set by a voltage-divider, which drops the out-

put voltage to the +1.25V feedback threshold voltage.

To change the 3.3V setting of MAIN, change the resis-

tor-divider ratio by changing R23. Use:

R23 = 80kΩ/V x (VOUT - 1.248V)

The MAIN output voltage may be set to any voltage

between +2.7V and +5.5V. For additional information,

refer to the MAX1802 IC data sheet.

Setting the Core Output Voltage

CORE is set by a voltage-divider, which drops the out-

put voltage to the +1.25V feedback threshold voltage.

To change the +1.8V setting of CORE, change the

resistor-divider ratio by changing R21. Use:

R21 = 80kΩ/V x (VCORE - 1.248V)

CORE may be set to any voltage between +1.25V and

+5.5V but must remain less than the voltage at MAIN.

The MAX1802 EV kit is configured so that MAIN powers

the CORE input.

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