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MAX1998 Datasheet

  • MAX1998

  • Quintuple/Triple-Output TFT LCD Power Supplies with Fault Pr...

  • Maxim   Maxim

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Quintuple/Triple-Output TFT LCD Power Supplies
with Fault Protection and VCOM Buffer
MAX1997/MAX1998
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V
IN
= 3.3V, V
MAIN
= 9V, V
G_ON
= 20V, V
G_OFF
= -7V, V
LOGIC
= 2.5V, V
GAMMA
= 8.6V, T
A
= +25擄C,
unless otherwise noted.)
STEP-UP REGULATOR LOAD TRANSIENT RESPONSE
(2
碌
s PULSES)
STEP-UP REGULATOR LOAD TRANSIENT RESPONSE
(WITHOUT LAG COMPENSATION, FIGURE 1)
(WITH LAG COMPENSATION, FIGURE 9)
MAX1997 toc08
MAX1997 toc09
STEP-UP REGULATOR LOAD TRANSIENT RESPONSE
(2
碌
s PULSES)
(WITH LAG COMPENSATION, FIGURE 9)
MAX1997 toc10
A
200mA
0
9V
A
1A
50mA
A
1A
50mA
B
8.9V
B
9V
8.9V
B
9V
8.9V
2A
1A
C
0.5A
0
10碌s/div
A: I
MAIN
= 0 TO 200mA, 200mA/div
B: V
MAIN
= 9V, 50mV/div, AC-COUPLED
C: INDUCTOR CURRENT, 500mA/div
R7 = 76.8k鈩? R8 = 12.1k鈩? R10 = 1.5k鈩? C10 = 470pF
C
2A
1A
0
4碌s/div
A: I
MAIN
= 50mA TO 1A, 1A/div
B: V
MAIN
= 9V, 100mV/div, AC-COUPLED
C: INDUCTOR CURRENT, 1A/div
C
1A
0
10碌s/div
A: I
MAIN
= 50mA TO 1A, 1A/div
B: V
MAIN
= 9V, 100mV/div, AC-COUPLED
C: INDUCTOR CURRENT, 1A/div
R7 = 76.8k鈩? R8 = 12.1k鈩? R10 = 1.5k鈩? C10 = 470pF
STEP-UP REGULATOR SOFT-START
MAX1997 toc11
POWER-UP SEQUENCE
5V
0
5V
A
0
10V
B
0
20V
C
10V
0
0
D
0
-10V
4ms/div
A: V
MAIN
, 10V/div
B: V
SOURCE
, 10V/div
C: V
GATE_ON
, 10V/div
D: V
GATE_OFF
, 10V/div
V
ONN
< V
ONP
< V
ON2
D
C
B
MAX1997 toc12
POWER-UP SEQUENCE
10V
A
0
10V
0
20V
10V
0
0
-10V
4ms/div
A: V
MAIN
, 10V/div
B: V
SOURCE
, 10V/div
C: V
GATE_ON
, 10V/div
D: V
GATE_OFF
, 10V/div
V
ONN
> V
ONP
> V
ON2
MAX1997 toc13
10V
A
B
0
5V
C
0
10V
D
5V
1ms/div
A: V
SHDN
, 5V/div
B: V
GATE
, 5V/div
C: V
DRAIN
, 5V/div
D: V
MAIN
, 5V/div
8
_______________________________________________________________________________________

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