MAX1578-MAX1579 Datasheet, PDF (12/13 Pages) Maxim Integrated Products – Complete Bias and White LED Power Supplies for Small TFT Displays

Complete Bias and White LED Power Supplies
for Small TFT Displays
Table 1. Recommended Components for
the Typical Application Circuit
DESIGNATION
DESCRIPTION
C1, C8
4.7µF, 6.3V X5R ceramic capacitors (0603)
Murata GRM188R60J475KE19
C2
0.1µF, 6.3V X5R ceramic capacitor (0402)
TDK C1005X5R1A104K
C3
0.1µF, 50V X7R ceramic capacitor (0603)
TDK C1608X7R1H104K
C4, C5, C12 ^{1µF, 16V X7R ceramic capacitors (0805)}
TDK C2012X7R1C105K
C6, C7
2.2µF, 6.3V X5R ceramic capacitors (0603)
Taiyo Yuden JMK107BJ225KA
C9, C10, C11, 1µF, 6.3V X5R ceramic capacitors (0402)
C13, C14 Murata GRM155R60J105KE19
D1
40V, 0.5A Schottky diode
International Rectifier MBRX0540
D2–D7
White LEDs
Nichia NSCW215T
L1
R1
R2, R3
22µH, 250mA inductor (1210)
Murata LQH32CN220K53
22.1Ω ±1% resistor (0402)
200Ω ±5% resistors (0402)
INPUT
2.7V TO 5.5V
C1
4.7µF
PWM OR
ANALOG
DIMMING
C2
0.1µF
ON
OFF
C6
2.2µF
C7
2.2µF
C8
4.7µF
MAIN OUTPUT
+5V, 25mA
C9
1µF
L1
22µH
IN
CTRL
COMP
LX
OUT
PGND
MAX1578
CS
MAX1579
ONBIAS
CU1
C1P
PMP
CD1
C1N
C2P
C2N
CU2
VDD
PMPB
CD2
POS
MAIN
CU3
GND
NEG
OUTPUT UP TO
D1
8 LEDS IN SERIES
C3
0.1µF
D2–D7
C10
1µF
C13 _R2
1µF _200Ω
C11
1µF
R1
22.1Ω
C14
1µF
R3
200Ω
C12
1µF
C5
1µF
POSITIVE OUTPUT
+15V, 100µA
C4
1µF
NEGATIVE OUTPUT
-10V, 100µA
Figure 3. Typical Application Circuit
12 ______________________________________________________________________________________