Owner manual

Typical Operating Characteristics (continued)
(Circuit of Figure 1. V
IN
= V
INL
= V
SUPP
= 12V, AV
DD
= 13.5V, V
GON
= 28V, V
GOFF
= -6V, V
OUT1
= 3.3V, FSEL = GND, T
A
= +25°C,
unless otherwise noted.)
MAX8728
Low-Cost, Multiple-Output
Power Supply for LCD Monitors/TVs
______________________________________________________________________________________ 11
NEGATIVE CHARGE-PUMP
LOAD TRANSIENT RESPONSE
MAX8728toc19
V
GOFF
, AC,
50mV/div
I
VGOFF
,
50mA/div
40μs/div
POWER-UP SEQUENCE
MAX8728toc20
2ms/div
DEL,
C
DEL
= 0.01μF
2V/div
V
GON
, 20V/div, 10kΩ LOAD
V
GOFF
, 5V/div,
10kΩ LOAD
EN, C
EN
= 0.01μF,
2V/div
AV
DD
, 5V/div, 150Ω LOAD
OUT1, 5V/div,
100Ω LOAD
INL SUPPLY CURRENT vs. INL VOLTAGE
INL VOLTAGE (V)
INL SUPPLY CURRENT (mA)
MAX8728 toc21
7 8 9 10111213
0
2
4
6
8
10
EN = GND
EN = GND
INL SUPPLY CURRENT vs. TEMPERATURE
TEMPERATURE (°C)
INL SUPPLY CURRENT (mA)
MAX87228 toc22
-40 -15 10 35 60 85
0
1
2
3
4
5
6
7
EN = VL
EN = GND
HIGH-VOLTAGE SWITCH
CONTROL (MODE 1)
MAX8728toc23
2μs/div
V
CTL
, 5V/div
0V
0V
0V
V
MODE
, 2V/div
V
GON
, 10V/div
HIGH-VOLTAGE SWITCH
CONTROL (MODE 2)
MAX8728toc23
2μs/div
V
CTL
, 5V/div
0V
0V
0V
V
MODE
, 2V/div
V
GON
, 10V/div