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TPS40074 Datasheet

  • TPS40074

  • 具有電壓前饋的中等范圍輸入同步降壓控制器

  • 38頁(yè)

  • TI

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TPS40074
SLUS617 鈥?APRIL 2005
ELECTRICAL CHARACTERISTICS (continued)
T
A
= 鈥?0擄C to 85擄C, V
IN
= 12 V
dc
, R
T
= 90.9 k鈩? I
KFF
= 300 碌A(chǔ), f
SW
= 500 kHz, all parameters at zero power dissipation
(unless otherwise noted)
PARAMETER
V
SW
t
PC
V
ILIM(pre)
t
HFALL
t
HRISE
t
HFALL
t
HRISE
t
LFALL
t
LRISE
t
LFALL
t
LRISE
V
OH
V
OL
V
OH
V
OL
Switching level to end precondition
Precondition time
(3)
Current limit precondition voltage threshold
(3)
High-side driver fall time
(3)
High-side driver rise time
(3)
High-side driver fall time
(3)
High-side driver rise time
(3)
Low-side driver fall time
(3)
Low-side driver rise time
(3)
Low-side driver fall time
(3)
Low-side driver rise time
(3)
High-level output voltage, HDRV
Low-level output voltage, HDRV
High-level output voltage, LDRV
Low-level output voltage, LDRV
6.8
36
48
72
96
24
48
48
96
0.7
0.95
0.06
0.65
0.65
0.875
0.03
0.3
15.2
6.2
1.10
4.15
275
I
PGD
= 1 mA
17.0
7.2
1.55
4.30
365
370
770
630
V
SA+
= V
SA-
= 1.25 V, Offset referenced to
SA+ and SA-
V
SA+
- V
SA-
= 4.5 V
550
mV
8.2
2.00
4.45
mV
V
1.0
1.35
0.10
1.00
1.00
1.300
0.05
0.5
(3)
TEST CONDITIONS
(V
VDD
- V
SW
)
MIN
TYP
2
MAX
100
UNIT
V
ns
V
OUTPUT DRIVERS
C
HDRV
= 2200 pF, (HDRV - SW)
C
HDRV
= 2200 pF, (HDRV - SW)
V
VDD
= 4.5 V
C
LDRV
= 2200 pF
C
LDRV
= 2200 pF, V
DD
= 4.5 V
I
HDRV
= -0.01 A, (V
BOOST
- V
HDRV
)
I
HDRV
= -0.1 A, (V
BOOST
- V
HDRV
)
(V
HDRV
- V
SW
), I
HDRV
= 0.01A
(V
HDRV
- V
SW
), I
HDRV
= 0.1 A
(V
DBP
- V
LDRV
), I
LDRV
= -0.01A
(V
DBP
- V
LDRV
), I
LDRV
= -0.1 A
I
LDRV
= 0.01 A
I
LDRV
= 0.1 A
V
VDD
= 12 V
R
KFF
= 90.9 k鈩? turn-on, V
VDD
rising
R
KFF
= 90.9 k鈩?/div>
Turn-on, V
VDD
rising
ns
ns
ns
ns
V
V
V
V
BOOST REGULATOR
V
BOOST
UVLO
V
UVLO
Programmable UVLO threshold voltage
Programmable UVLO hysteresis
Fixed UVLO threshold voltage
Fixed UVLO hysteresis
POWER GOOD
V
PGD
V
FBH
V
FBL
V
IO
A
DIFF
V
ICM
R
G
I
OH
I
OL
GBWP
Powergood voltage
High-level output voltage, FB
Low-level output voltage, FB
Output voltage
V
SENSE AMPLIFIER
Input offset voltage
Differential gain
Input common mode range
(4)
Internal resistance for setting gain
Output source current
Output sink current
Gain bandwidth
(3)
Shutdown temperature threshold
(3)
Hysteresis
(3)
(3)
(4)
Ensured by design. Not production tested.
3 V at internal amplifier terminals, 6 V at SA+ and SA- pins.
5
-9
0.995
0
14
2
15
20
10
25
2
165
15
1.000
9
1.005
6
26
15
35
V
k鈩?/div>
mA
MHz
mV
THERMAL SHUTDOWN
擄C

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