Rainbow Electronics MAX1531 User Manual
Page 3
MAX1530/MAX1531
Multiple-Output Power-Supply Controllers for
LCD Monitors
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
IN
= 12V, V
EN
= V
SEQ
= 5V, T
A
= 0
°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25
°C.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Comparator Bandwidth
For EN, FB, FBL_
10
kHz
Duration to Trigger Fault Latch
For FB, FBL_
51
64
77
ms
Overcurrent Protection Threshold
(V
CSH
- V
CSL
)
270
300
330
mV
Overcurrent Sense Common-
Mode Range
V
CSH
, V
CSL
2.7
28.0
V
CSH Input Current
V
CSH
= 2.7V to 28V
100
µA
CSL Input Current
V
CSL
= V
CSH
= 12V
-50
+50
nA
Overcurrent Sense Filter RC Time
Constant
50
µs
THERMAL PROTECTION
Thermal Shutdown
Temperature rising, 15°C hysteresis
160
°C
RESET FUNCTION
RSTIN Reset Trip Level
RSTIN falling, 25mV hysteresis
1.081
1.114
1.147
V
RSTIN Input Leakage Current
V
RSTIN
= 1.5V
-50
+50
nA
Comparator Bandwidth
10
kHz
Reset Timeout Period
102
128
154
ms
RESET Output Low Level
I
RESET
= -1mA
0.4
V
RESET Output High Leakage
V
RESET
= 5V
1
µA
STEP-DOWN CONTROLLER
ERROR AMPLIFIER
FB Regulation Voltage
1.223
1.238
1.253
V
Transconductance
FB to COMP
70
100
140
µS
Voltage Gain
FB to COMP
200
V/V
Minimum Duty Cycle
15
%
FB Input Leakage Current
V
FB
= 1.5V
-50
+50
nA
FB Input Common-Mode Range
(Note 2)
-0.1
+1.5
V
COMP Output Minimum Voltage
V
FB
= 1.5V
1
V
COMP Output Maximum Voltage
V
FB
= 1.175V
3
V
Current-Sense Amplifier Voltage
Gain
V
IN
- V
LX
2.75
3.5
4.0
V/V
Current-Limit Threshold
(Default Mode)
PGND - LX, ILIM = VL
190
250
310
mV
Current-Limit Threshold
(Adjustable Mode)
PGND - LX, V
ILIM
= 1.25V
190
250
310
mV
ILIM Inp ut D ual M od e™ Thr eshol d
3.0
3.5
4.00
V
OSCILLATOR
FREQ = AGND
200
250
300
Switching Frequency
FREQ = VL
425
500
575
kHz
FREQ = AGND
75
80
88
Maximum Duty Cycle
FREQ = VL
75
80
88
%
Dual Mode is a trademark of Maxim Integrated Products, Inc.