Rainbow Electronics MAX8728 - Manual (Page 11)

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
40 μs/div
POWER-UP SEQUENCE
MAX8728toc20
2ms/div
DEL,
C
DEL = 0.01 μF
2V/div
V GON , 20V/div, 10k Ω LOAD
V GOFF , 5V/div,
10k Ω LOAD
EN, C EN = 0.01 μF,
2V/div
AV DD , 5V/div, 150 Ω LOAD
OUT1, 5V/div,
100 Ω LOAD
INL SUPPLY CURRENT vs. INL VOLTAGE
INL VOLTAGE (V)
INL SUPPLY CURRENT (mA)
MAX8728 toc21
7 8 9 10 11 12 13
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
2 μs/div
V CTL , 5V/div
0V
0V
0V
V
MODE
, 2V/div
V GON , 10V/div
HIGH-VOLTAGE SWITCH
CONTROL (MODE 2)
MAX8728toc23
2 μs/div
V CTL , 5V/div
0V
0V
0V
V
MODE
, 2V/div
V GON , 10V/div