MAX1530_09 Datasheet, PDF (10/33 Pages) Maxim Integrated Products – Multiple-Output Power-Supply Controllers for LCD Monitors

Multiple-Output Power-Supply
Controllers for LCD Monitors
Typical Operating Characteristics (continued)
(Circuit of Figure 1; including R5, R6, and D2; T_A = +25°C, unless otherwise noted.)
LR5 NORMALIZED LOAD REGULATION
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
10
20
30
40
50
LOAD CURRENT (mA)
LR5 NORMALIZED LINE REGULATION
1.0
20mA LOAD CURRENT
0.8
0.6
0.4
0.2
0
-0.2
-25
-21
-17
-13
-9
INPUT VOLTAGE (V)
Pin Description
PIN
MAX1530 MAX1531
1
1
2
2
3
3
4
4
5–10, 18, 19
—
11
11
NAME
FUNCTION
DRV2
Gamma Linear Regulator (LR2) Base Drive. Open drain of an internal N-channel MOSFET.
Connect DRV2 to the base of an external PNP pass transistor to form a positive linear
regulator. (See the Pass Transistor Selection section.)
FBL2
Gamma Linear Regulator (LR2) Feedback Input. FBL2 regulates at 1.245V nominal.
Connect FBL2 to the center tap of a resistive voltage-divider between the LR2 output and
AGND to set the output voltage. Place the divider close to the FBL2 pin.
FBL3
Gate-On Linear Regulator (LR3) Feedback Input. FBL3 regulates at 1.245V nominal.
Connect FBL3 to the center tap of a resistive voltage-divider between the LR3 output and
AGND to set the output voltage. Place the divider close to the FBL3 pin.
DRV3
N. C.
RSTIN
Gate-On Linear Regulator (LR3) Base Drive. Open drain of an internal N-channel MOSFET.
Connect DRV3 to the base of an external PNP pass transistor to form a positive linear
regulator. (See the Pass Transistor Selection section.)
No Connection. Not internally connected.
Adjustable Reset Input. RESET asserts low when the monitored voltage is less than the
reset trip threshold. RESET goes to a high-impedance state only after the monitored
voltage remains above the reset trip threshold for the duration of the reset timeout period.
Connect RSTIN to the center tap of a resistive voltage-divider between the monitored
output voltage and AGND to set the reset trip threshold. The internal RSTIN threshold of
90% of 1.238V allows direct connection of RSTIN to any of the device’s positive feedback
pins.
10 ______________________________________________________________________________________