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TPS51315 Datasheet(PDF) 4 Page - Texas Instruments

No. de pieza TPS51315
Descripción Electrónicos  10-A STEP-DOWN SYNCHRONOUS SWITCHER WITH INTEGRATED MOSFETs
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS51315 Datasheet(HTML) 4 Page - Texas Instruments

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Not Recommended for New Designs
TPS51315
SLUS881B – MAY 2009 – REVISED AUGUST 2012
www.ti.com
ELECTRICAL CHARACTERISTICS
over recommended free-air temperature range (unless otherwise noted)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
SUPPLY CURRENT
V5IN current, TA = 25°C, No Load,
IV5IN
V5IN supply current
0
1
μA
EN_PSV = 5V, VVFB = 0.75 V, VLL = 0.5 V
V5FILT current, TA = 25°C, No Load,
IV5FILT
V5FILT supply current
400
μA
VEN_PSV = 5 V, VVFB = 0.75 V, LL = 0.5 V
V5IN current, TA = 25°C, No Load,
IV5INSDN
V5IN shutdown current
0
1
μA
VEN_PSV = 0 V
V5FILT current, TA = 25°C, No Load,
IV5FILTSDN
V5FILT shutdown current
1.5
4.5
7.5
μA
VEN_PSV = 0 V
VOUT AND VREF VOLTAGES
VOUT
Output voltage
Adjustable output range
0.75
5.5
V
VVFB
VFB regulation voltage
VFB voltage
751
mV
TA = 25°C, bandgap initial accuracy
–0.9%
0.9%
VVFB_TOL
VFB regulation voltage tolerance
0°C
≤ TA ≤ 85°C
–1.3%
1.3%
–40°C
≤ TA ≤ 85°C
–1.6%
1.6%
IVFB
VFB input current
VVFB = 0.75 V, TA = 25°C
–0.025
μA
RDischg
VOUT_DS discharge resistance
VEN_PSV = 0 V, VOUT_DS = 0.75 V
20
HOUSEKEEPING CLOCK, ON-TIME TIMER, and INTERNAL SOFT START
TONN
Nominal on-time
VIN = 10 V, VOUT = 2.5 V, RT(on) = 250 kΩ
1115
ns
TONF
Fast switch on-time
VIN = 10 V, VOUT = 2.5 V, RT(on) = 100 kΩ
865
ns
TONS
Slow switch on-time
VIN = 10 V, VOUT = 2.5 V, RT(on) = 400 kΩ
1515
ns
TON
Minimum on-time
VIN = 10 V, VOUT = 0.75 V, RT(on) = 100 kΩ
(1)
170
200
ns
TA = 25°C, VVFB = 0.75 V, VLL = –0.1V,
TOFF(min)
Minimum off-time
385
ns
VTRIP = OPEN
TSS
Internal soft-start time
TA = 25°C, VEN_PSV > 3 V
1.06
ms
f CLK
Clock frequency
Soft-start, UVP, OVP, PGOOD(2)
240
250
260
kHz
INTERNAL BST DIODE
VFBST
Forward voltage
VV5IN-VBST, IF = 10 mA, TA = 25°C
0.7
0.8
0.9
V
IVBSTLK
VBST leakagecurrent
VVBST = 26 V, LL = 20 V, TA = 25°C
0.1
1
μA
PROTECTIONS: OVERCURRENT LIMIT (OCL), UNDERCURRENT LIMIT (UCL)
(VTRIP-GND– VPGND-LL) voltage
VOCL(off)
Overcurrent limit comparator offset
–10
0
10
mV
VTRIP-GND = 60 mV
(VTRIP-GND– VLL-PGND) voltage
VUCL(off)
Undercurrent limit comparator offset
–9.5
0.5
10.5
mV
VTRIP-GND = 60 mV, EN_PSV=FLOAT
VZC(off)
Zero crossing comparator offset
VPGND-LL voltage, V EN_PSV = 3.3V
–9.5
0.5
10.5
mV
VRTRIP
Current limit threshold setting range
VTRIP-GND voltage
(2) , T
A = 25°C
30
mV
ITRIP
TRIP source current
VTRIP < 0.3 V, TA = 25°C
9
10
11
μA
Trip source current temperature
TCITRIP
TA = 25°C
(2)
4500
ppm/°C
coefficient
(1)
Design constraint. Ensure actual on-time is greater than the maxiumum value (design RT(on) so that the minimum tolerance is 100 kΩ).
(2)
Ensured by design. Not production tested.
4
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