MAX1530_09 Datasheet, PDF (7/33 Pages) Maxim Integrated Products – Multiple-Output Power-Supply Controllers for LCD Monitors

Multiple-Output Power-Supply
Controllers for LCD Monitors
Typical Operating Characteristics
(Circuit of Figure 1; including R5, R6, and D2; T_A = +25°C, unless otherwise noted.)
STEP-DOWN EFFICIENCY vs. LOAD CURRENT
100
f_SW = 500kHz
90
V_IN = 12V
V_IN = 20V
80
70
60
50
0
300 600 900 1200 1500
LOAD CURRENT (mA)
STEP-DOWN REGULATOR LOAD TRANSIENT
MAX1530 toc04
A
0A
B
3.3V
C
0A
40µs/div
A: LOAD CURRENT, 1A/div
B: OUTPUT VOLTAGE, 200mV/div, AC-COUPLED
C: INDUCTOR CURRENT, 1A/div
STEP-DOWN LOAD REGULATION
0
-0.04
-0.08
-0.12
-0.16
0
300 600 900 1200 1500
LOAD CURRENT (mA)
STEP-DOWN REGULATOR
SWITCHING WAVEFORM
MAX1530 toc05
SWITCHING FREQUENCY vs. LOAD CURRENT
520
515
510
505
500
495
490
485
480
0
300 600 900 1200 1500
LOAD CURRENT (mA)
STEP-DOWN REGULATOR
SOFT-START
MAX1530 toc06
A
0V
B
3.3V
C
0A
2µs/div
A: LX, 10V/div
B: OUTPUT VOLTAGE, 20 mV/div, AC-COUPLED
C: INDUCTOR CURRENT, 1A/div
1ms/div
A: EN, 2V/div
B: OUTPUT VOLTAGE, 2V/div
C: INDUCTOR CURRENT, 1A/div
A
0V
B
0V
C
0A
0
-0.1
-0.2
-0.3
-0.4
-0.5
0
VL LOAD REGULATION
STARTUP SEQUENCE
MAX1530 toc08
A
B
C
D
E
LR1 BASE CURRENT
vs. DRV1 VOLTAGE
15
V_FBL1 = 1.175V
12
9
6
F
3
G
0
5 10 15 20 25 30
4ms/div
0
2
4
6
8
10
LOAD CURRENT (mA)
A: V_L, 10V/div
B: V_OUT, 5V/div
E: V_GAMMA, 20V/div
F: V_GOFF, 20V/div
DRV1 VOLTAGE (V)
C: V_LOGIC, 5V/div
G: V_GON, 40V/div
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