Datasheet

Multi-Output Power Supplies with VCOM Amplifier
and High-Voltage Gamma Reference for LCD TVs
MAX17126/MAX17126A
12 _____________________________________________________________________________________
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
SWITCHING FREQUENCY
vs. INPUT VOLTAGE
MAX17126 toc10
V
IN
(V)
SWITCHING FREQUENCY (kHz)
141210
489
490
491
492
493
494
495
496
497
498
488
8 16
GAMMA REFERENCE LINE REGULATION
(LOAD = 20mA)
MAX17126 toc12
VOP VOLTAGE (V)
GAMMA REFERENCE VOLTAGE (V)
17.517.016.516.015.5
14.89
14.94
14.99
15.04
15.09
15.14
14.84
15.0 18.0
GAMMA REFERENCE LOAD
REGULATION (V
REF
= 16V)
MAX17126 toc13
LOAD CURRENT (mA)
GAMMA REFERENCE VOLTAGE (V)
20015010050
14.6
14.7
14.8
14.9
15.0
15.1
15.2
14.5
0 250
REFERENCE VOLTAGE LOAD
REGULATION
MAX17126 toc11
LOAD CURRENT (FA)
REFERENCE VOLTAGE (V)
15010050
1.2470
1.2475
1.2480
1.2485
1.2490
1.2465
0 200
SWITCHING
NO SWITCHING
STEP-UP REGULATOR PULSED LOAD
TRANSIENT RESPONSE (0.1A TO 1.9mA)
MAX17126 toc08
0V
0A
0A
I
L1
1A/div
10Fs/div
L = 10FH
V
AVDD
(AC-COUPLED)
200mV/div
I
LOAD
1A/div
STEP-UP REGULATOR HEAVY LOAD
SOFT-START (0.5A)
MAX17126 toc09
0V
0V
0V
0A
I
L1
1A/div
1ms/div
V
AVDD
5V/div
V
GD
5V/div
EN
5V/div
STEP-UP REGULATOR LOAD TRANSIENT
RESPONSE (0.1A TO 1.1A)
MAX17126 toc07
0V
0A
0A
I
L1
1A/div
20Fs/div
L = 10FH
V
AVDD
(AC-COUPLED)
200mV/div
I
LOAD
1A/div