TPS54332
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SLVS875B –JANUARY 2009–REVISED FEBRUARY 2012
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
12 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
SHUTDOWN QUIESCENT CURRENT
SWITCHING FREQUENCY
vs
vs
JUNCTION TEMPERATURE
INPUT VOLTAGE
JUNCTION TEMPERATURE
8
1020
1010
1000
120
VIN = 12 V
VIN = 12 V
EN = 0 V
110
100
T
= 150°C
J
6
T
= -40°C
J
90
80
70
60
4
2
0
990
980
T
= 25°C
J
-50
-25
0
25
50
75
100
125
150
-50
-25
0
25
50
75
100
125
150
T
- Junction Temperature - °C
8
23
18
28
3
13
J
TJ - Junction Temperature - °C
V
- Input Voltage - V
I
Figure 1.
Figure 2.
Figure 3.
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