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TPS40077 数据表(PDF) 5 Page - Texas Instruments

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部件名 TPS40077
功能描述  HIGH-EFFICIENCY, MIDRANGE-INPUT, SYNCHRONOUS BUCK CONTROLLER WITH VOLTAGE FEED-FORWARD
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

TPS40077 数据表(HTML) 5 Page - Texas Instruments

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TPS40077
SLUS714 – JANUARY 2007
ELECTRICAL CHARACTERISTICS (continued)
T
A = –40°C to 85°C, VIN = 12 Vdc, RT = 90.9 kΩ, IKFF = 300 µA, fSW = 500 kHz, all parameters at zero power dissipation
(unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
SHORT-CIRCUIT CURRENT PROTECTION
IILIM
Current sink into current limit
80
105
125
µA
VILIM(ofst)
Current limit offset voltage (VSW – VILIM)
VILIM = 11.5 V, VVDD = 12 V
–75
–50
–30
mV
tHSC
Minimum HDRV pulse duration
During short circuit
135
225
ns
Propagation delay to output (2)
50
ns
tBLANK
Blanking time(2)
50
ns
tOFF
Off time during a fault (SS cycle times)
7
Cycles
Switching level to end precondition
VSW
2
V
(VVDD – VSW)(2)
tPC
Precondition time(2)
100
ns
VILIM
Current limit precondition voltage threshold(2)
6.8
V
OUTPUT DRIVERS
tHFALL
High-side driver fall time (HDRV – SW)(2)
36
ns
CHDRV = 2200 pF
tHRISE
High-side driver rise time (HDRV – SW)(2)
48
ns
tHFALL
High-side driver fall time (HDRV – SW)(2)
72
ns
CHDRV = 2200 pF, VVDD = 4.5 V,
0.2 V
≤ V
SS ≤ 4 V
tHRISE
High-side driver rise time (HDRV – SW)(2)
96
ns
tLFALL
Low-side driver fall time(2)
24
ns
CLDRV = 2200 pF
tLRISE
Low-side driver rise time(2)
48
ns
tLFALL
Low-side driver fall time(2)
48
ns
CLDRV = 2200 pF, VVDD = 4.5 V,
0.2 V
≤ V
SS ≤ 4 V
tLRISE
Low-side driver rise time(2)
96
ns
IHDRV = –0.01 A
0.7
1
High-level output voltage, HDRV
VOH
V
(VBOOST – VHDRV)
IHDRV = –0.1 A
0.95
1.3
IHDRV = 0.01A
0.06
0.1
VOL
Low-level output voltage, HDRV (VHDRV – VSW)
V
IHDRV = 0.1 A
0.65
1
ILDRV= –0.01A
0.65
1
High-level output voltage, LDRV
VOH
V
(VDBP – VLDRV)
ILDRV = –0.1 A
0.875
1.2
ILDRV = 0.01 A
0.03
0.05
VOL
Low-level output voltage, LDRV
V
ILDRV = 0.1 A
0.3
0.5
BOOST REGULATOR
VBOOST
Output voltage
VDD = 12 V
15.2
17
V
UVLO
VUVLO
Programmable UVLO threshold voltage
RKFF = 90.9 kΩ, turn-on, VVDD rising
6.2
7.2
8.2
Programmable UVLO hysteresis
RKFF = 90.9 kΩ
1.1
1.55
2
V
Fixed UVLO threshold voltage
Turn-on, VVDD rising
4.15
4.3
4.45
Fixed UVLO hysteresis
275
365
mV
POWER GOOD
VPG
Power-good voltage
IPG = 1 mA
370
500
VOH
High-level output voltage, FB
770
mV
VOL
Low-level output voltage, FB
630
THERMAL SHUTDOWN
Shutdown temperature threshold(2)
165
°C
Hysteresis(2)
15
(2)
Assured by design. Not production tested.
5
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