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TPS40051 Datasheet(PDF) 3 Page - Texas Instruments

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No. de pieza TPS40051
Descripción Electrónicos  WIDE-INPUT SYNCHRONOUS BUCK CONTROLLER
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI - Texas Instruments

TPS40051 Datasheet(HTML) 3 Page - Texas Instruments

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TPS40050
TPS40051
TPS40053
SLUS540F − DECEMBER 2002 − REVISED JUNE 2004
www.ti.com
3
ELECTRICAL CHARACTERISTICS
TA = −40°C to 85°C, VIN = 24 Vdc, RT = 90.9 kΩ, IKFF = 150 µA, fSW = 500 kHz, all parameters at zero power dissipation
(unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
INPUT SUPPLY
VIN
Input voltage range, VIN
8
40
V
OPERATING CURRENT
IDD
Quiescent current
Output drivers not switching,
VFB ≥ 0.75 V
1.5
3.0
mA
BP5
VBP5
Output voltage
IOUT ≤ 1 mA
4.7
5.0
5.2
V
OSCILLATOR/RAMP GENERATOR(2)
fOSC
Accuracy
8 V
≤ VIN ≤ 40 V
470
500
570
kHz
VRAMP PWM ramp voltage(1)
VPEAK−VVAL
2.0
V
VIH
High-level input voltage, SYNC
2
5
V
VIL
Low-level input voltage, SYNC
0.8
V
ISYNC
Input current, SYNC
5
10
µA
Pulse width, SYNC
50
ns
VRT
RT voltage
2.38
2.50
2.58
V
Maximum duty cycle
VFB = 0 V, fSW ≤ 500 kHz
85%
94%
Maximum duty cycle
VFB = 0 V, 500 kHz ≤ fSW ≤ 1 MHz
80%
Minumum duty cycle
VFB ≥ 0.75 V
0%
VKFF
Feed-forward voltage
3.35
3.48
3.65
V
IKFF
Feed-forward current operating range(1)
20
1100
µA
SOFT START
ISS
Soft-start source current
1.75
2.35
2.85
µA
VSS
Soft-start clamp voltage
3.7
V
tDSCH
Discharge time
CSS = 220 pF
1.6
2.2
2.8
s
tSS
Soft-start time
CSS = 220 pF, 0 V ≤ VSS ≤ 1.6 V
115
155
205
µs
BP10
VBP10
Ouput voltage
IOUT ≤ 1 mA
9.0
9.6
10.3
V
ERROR AMPLIFIER
8 V
≤ VIN ≤ 40 V,
TA = 25°C
0.698
0.700
0.704
VFB
Feedback input voltage
8 V
≤ VIN ≤ 40 V,
0
°C ≤ TA ≤ 85°C
0.690
0.700
0.707
V
VFB
Feedback input voltage
8 V
≤ VIN ≤ 40 V,
−40
°C ≤ TA ≤ 85°C
0.690
0.700
0.715
V
GBW
Gain bandwidth
3.0
5.0
MHz
AVOL
Open loop gain
60
80
dB
IOH
High-level output source current
2.0
4.0
mA
IOL
Low-level output sink current
2.5
4.0
mA
VOH
High-level output voltage
ISOURCE = 500 µA
3.2
3.5
V
VOL
Low-level output voltage
ISINK = 500 µA
0.20
0.35
V
IBIAS
Input bias current
VFB = 0.7 V
100
200
nA
(1)
Ensured by design. Not production tested.
(2)
IKFF increases with SYNC frequency, IKFF decreases with maximum duty cycle


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