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参数资料
| 型号： | MAX1844EVKIT |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Evaluation Kit for the MAX1844 |
| 中文描述： | MAX1844评估板 |
| 文件页数： | 3/8页 |
| 文件大小： | 313K |
| 代理商： | MAX1844EVKIT |
input voltages below 1.8V but with reduced output cur-
rent capability. Refer to the MAX1800 data sheet for the
minimum allowable input voltage for the part to start at
a given load.
When the MAIN output is in regulation, the MAIN_OK
output will be pulled up to the MAIN output voltage. If
the MAIN_OK output is low (near ground), MAIN is not
in regulation.
LDO Output
The LDO output is linearly regulated from MAIN to 1.8V.
Note that the load current on LDO is produced from
MAIN. Drawing more than 200mA out of LDO reduces
the current capability at MAIN.
To enable LDO, place jumper JU3 in the 1-2 (ON) posi-
tion.
OUT1_ (Flyback Outputs)
The voltages at OUT1_ are typical of CCD bias volt-
ages. The output voltages are 14.3V/10mA, 5V/50mA,
and -8.15V/10mA. These voltages are generated
through a custom flyback transformer. OUT1B (5V) is
used to regulate the flyback circuit. The other output
voltages (14.3V and -8.15V) are controlled by the turns-
ratio of the flyback transformer. If the 14.3V and -8.15V
outputs are not loaded at the fixed 10mA load, then the
output voltage will change from the nominal loaded out-
put voltage. Loads are included on the MAX1800 EV kit
by shorting jumpers JU7 through JU12. If external
loads are used, disable the built-in loads by removing
these jumpers.
To enable OUT1_, place jumper JU4 to the 1-2 (ON)
position. To disable OUT1_, place jumper JU4 to the 2-
3 (OFF) position. To enable/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 (OUT1_ and
OUT2_)
section.
OUT2_ (Flyback Outputs)
The voltages at OUT2_ are typical of LCD bias volt-
ages. The output voltages are 13.85V/10mA, 5V/50mA,
and -16.23V/10mA. These voltages are generated
through a custom flyback transformer. OUT2B (5V) is
used to regulate the flyback circuit. The other output
voltages (13.85V and -16.23V) are controlled by the
turns-ratio of the flyback transformer. If the 13.85V and
-16.23V 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
MAX1800 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 JU5 to the 1-2 (ON)
position. To disable OUT2_, place jumper JU5 to the 2-
3 (OFF) position. To enable/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 (OUT1_ and
OUT2_)
section.
OUT3
The voltage at OUT3 is typical of that required by a
CCFL backlight inverter. To enable OUT3, place jumper
JU6 to the 1-2 (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
(OUT3 and OUT4)
section.
OUT3 can be configured to drive a white LED backlight
instead of a CCFL backlight.
OUT4
The voltage at OUT4 is a general-purpose 5V output
that can be used for powering a small motor or other
peripheral circuitry and can supply up to 500mA. To
enable OUT4, place jumper JU1 to the 1-2 (ON) posi-
tion. Place the external load between OUT4 and GND.
To change the output voltage of OUT4, see the
Setting
the Step-Up Output Voltage (OUT3 and OUT4)
section.
E
MAX1800 Evaluation Kit
_______________________________________________________________________________________
3
LABEL
MAIN
LDO
OUT1A
OUT1B
OUT1C
OUT2A
OUT2B
OUT2C
OUT3
OUT4
VOLTAGE/CURRENT
3.3V at 400mA
1.8V at 200mA
14.3V at 10mA
5V at 50mA
-8.15V at 10mA
13.85V at 10mA
5V at 50mA
-16.23V at 10mA
7V at 100mA
5V at 500mA
Table 1. Output Voltage and Current
Capability
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