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SLVS839B – JULY 2008 – REVISED OCTOBER 2008
FUNCTIONAL BLOCK DIAGRAM
EN
VIN
165 C
Thermal
Shutdown
1
m
A
3
m
A
Shutdown
Shutdown
Logic
1.25 V
Enable
Threshold
Enable
Comparator
Boot
Charge
Boot
UVLO
2.1V
12 A/V
Current
Sense
80 mW
™
ECO-MODE
Minimum Clamp
Error
Amplifier
2
m
A
gm = 92
m
A/V
DC gain = 800 V/V
BW = 2.7 MHz
Voltage
Reference
2 kW
0.8 V
Discharge
Logic
VSENSE
Frequency
Shift
Oscillator
Shutdown
BOOT
VSENSE
PWM
Comparator
Gate
Drive
Logic
PWM
Latch
R
S
Q
SS
S
Slope
Compensation
PH
COMP
Maximum
Clamp
GND
TYPICAL CHARACTERISTICS
CHARACTERIZATION CURVES
ON RESISTANCE
vs
JUNCTION TEMPERATURE
110
105
100
VIN = 12 V
SHUTDOWN QUIESCENT CURRENT
vs
INPUT VOLTAGE
4
590
SWITCHING FREQUENCY
vs
JUNCTION TEMPERATURE
VIN = 12 V
585
EN = 0 V
fsw - Oscillator Frequency - kHz
Isd - Shutdown Current -
m
A
Rdson - On Resistance - mW
3
T
J
= 150°C
580
95
90
85
80
75
70
65
60
-50
575
570
565
560
555
2
T
J
= 25°C
1
T
J
= -40°C
0
-25
0
25
50
75
100
T
J
- Junction Temperature - °C
125
150
3
8
13
18
V
I
- Input Voltage - V
23
28
550
-50
-25
0
25
50
75
100
125
150
T
J
- Junction Temperature - °C
Figure 1.
Figure 2.
Figure 3.
Copyright © 2008, Texas Instruments Incorporated
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