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参数资料
| 型号： | MAX1578-MAX1579 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Complete Bias and White LED Power Supplies for Small TFT Displays |
| 中文描述： | 完整的偏置和白光LED电源的小型液晶显示器 |
| 文件页数： | 6/13页 |
| 文件大小： | 221K |
| 代理商： | MAX1578-MAX1579 |
M
Complete Bias and White LED Power S upplies
for S mall T FT Displays
6
_______________________________________________________________________________________
-5.0
-3.5
-4.0
-4.5
-3.0
-2.5
-2.0
-1.5
-1.0
POS
NEG
-0.5
0
0
40
20
60
80
100
POS AND NEG LOAD REGULATION
M
LOAD CURRENT (
μ
A)
V
-0.6
-0.4
-0.5
-0.2
-0.3
-0.1
0
0
25
MAIN OUTPUT LOAD REGULATION
M
LOAD CURRENT (mA)
V
10
5
15
20
PIN
NAME
FUNCTION
1
MAIN
LDO Output and the POS and NEG Charge-Pump Inputs. V
MAIN
is regulated to 5V. Bypass to GND
with a 1μF capacitor. Output is internally discharged with a 1k
resistor when V
ONBIAS
= 0V.
POS Charge-Pump Capacitor Connection 1. Connect a 1μF capacitor between CU1 and PMP.
POS Charge-Pump Capacitor Connection 2. Connect a 1μF capacitor between CU2 and PMPB.
POS Charge-Pump Capacitor Connection 3. Connect a 1μF capacitor between CU3 and GND.
2
3
4
CU1
CU2
CU3
5
POS
Output of Positive (3x) Charge Pump. Bypass POS to GND with a 1μF capacitor. POS is internally
discharged with a 3k
resistor when V
ONBIAS
= 0V.
6
PMP
Charge-Pump Capacitor Connection. Connect a 1μF capacitor between PMP and CU1 and another
1μF capacitor between PMP and CD1.
7
PMPB
Charge-Pump Capacitor Connection. Connect a 1μF capacitor between PMPB and CU2 and another
1μF capacitor between PMPB and CD2. PMPB is 180
°
out of phase with PMP.
8
CD1
NEG Charge-Pump Capacitor Connection 1. Connect a 1μF capacitor and a 200
±5% resistor in
series between CD1 and PMP.
9
CD2
NEG Charge-Pump Capacitor Connection 2. Connect a 1μF capacitor and a 200
±5% resistor in
series between CD2 and PMPB.
10
NEG
Output of Inverting (-2x) Charge Pump. Bypass NEG to GND with a 1μF capacitor. Output is internally
discharged with a 1.5k
resistor when V
ONBIAS
= 0V.
Pin Desc ription
Typic al Operating Charac teristic s (c ontinued)
(Circuit of Figure 3, V
IN
= 3.6V, I
LED
= 20mA, 4 LEDs, CTRL = IN, T
A
= +25
°
C, unless otherwise noted.)
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