TPS54231
www.ti.com .............................................................................................................................................................................................. SLUS851–OCTOBER 2008
FUNCTIONAL BLOCK DIAGRAM
EN
VIN
165C
Thermal
Shutdown
1 mA
3 mA
Shutdown
Shutdown
Logic
1.25 V
Enable
Threshold
Enable
Comparator
Boot
Charge
™
ECO-MODE
Minimum Clamp
Boot
UVLO
BOOT
2.1V
Error
Amplifier
9 A/V
Current
Sense
PWM
Comparator
PWM
Latch
VSENSE
R
Q
80 mW
2 mA
Gate
Drive
Logic
gm = 92 mA/V
DC gain = 800 V/V
BW = 2.7 MHz
S
Voltage
Reference
SS
Slope
Compensation
2 kW
S
0.8 V
Shutdown
PH
Discharge
Logic
VSENSE
Frequency
Shift
Oscillator
GND
COMP
Maximum
Clamp
TYPICAL CHARACTERISTICS
CHARACTERIZATION CURVES
ON RESISTANCE
vs
JUNCTION TEMPERATURE
SHUTDOWN QUIESCENT CURRENT
SWITCHING FREQUENCY
vs
JUNCTION TEMPERATURE
vs
INPUT VOLTAGE
4
3
110
590
585
VIN = 12 V
VIN = 12 V
105
EN = 0 V
TJ = 150°C
100
95
580
575
570
90
85
80
75
2
TJ = 25°C
565
560
1
0
TJ = -40°C
70
65
60
555
550
-50
-25
0
25
50
75
100
125
150
-50
-25
0
25
50
75
100
125
150
3
8
13
18
23
28
TJ - Junction Temperature - °C
VI - Input Voltage - V
TJ - Junction Temperature - °C
Figure 1.
Figure 2.
Figure 3.
Copyright © 2008, Texas Instruments Incorporated
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