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TPS51275 датащи(PDF) 6 Page - Texas Instruments

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номер детали TPS51275
подробное описание детали  Dual Synchronous, Step-Down Controller with 5-V and 3.3-V LDOs
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI - Texas Instruments

TPS51275 датащи(HTML) 6 Page - Texas Instruments

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TPS51275, TPS51275B, TPS51275C
SLUSB45B – JUNE 2012 – REVISED MARCH 2013
www.ti.com
ELECTRICAL CHARACTERISTICS
over operating free-air temperature range, VVIN= 12 V, VVO1= 5 V, VVFB1= VVFB2= 2 V, VEN1= VEN2= 3.3 V (unless otherwise
noted)
PARAMETER
TEST CONDITION
MIN
TYP
MAX
UNIT
OUTPUT DISCHARGE
TA = 25°C, VVO1 = 0.5 V
RDIS1
CH1 discharge resistance
35
Ω
VEN1 = VEN2 = 0 V
RDIS2
CH2 discharge resistance
TPS51275
TA = 25°C, VSW2 = 0.5 V, VEN1 = VEN2 = 0 V
75
Ω
TA = 25°C, VSW2 = 0.5 V, VEN1 = VEN2 = 0 V
RDIS2
CH2 discharge resistance
70
Ω
(TPS51275B/C)
SOFT START OPERATION
tSS
Soft-start time
From ENx="Hi" and VVREG5 > VUVLO5 to VOUT = 95%
0.91
ms
tSSRAMP
Soft-start time (ramp-up)
VOUT= 0% to VOUT = 95%, VVREG5 = 5 V
0.78
ms
POWER GOOD
Lower (rising edge of PG-in)
92.5%
95.0%
97.5%
Hysteresis
5%
VPGTH
PG threshold
Upper (rising edge of PG-out)
107.5% 110.0% 112.5%
Hysteresis
5%
IPGMAX
PG sink current
VPGOOD = 0.5 V
6.5
mA
IPGLK
PG leak current
VPGOOD = 5.5 V
1
µA
tPGDEL
PG delay
From PG lower threshold (95%=typ) to PG flag high
0.7
ms
CURRENT SENSING
ICS
CS source current
TA = 25°C, VCS= 0.4 V
9
10
11
μA
TCCS
CS current temperature coefficient(1)
On the basis of 25°C
4500
ppm/°C
VCS
CS Current limit setting range
0.2
2
V
VZC
Zero cross detection offset
TA = 25°C
–1
1
3
mV
LOGIC THRESHOLD
VENX(ON)
EN threshold high-level
SMPS on level
1.6
V
VENX(OFF)
EN threshold low-level
SMPS off level
0.3
V
IEN
EN input current
VENx= 3.3 V
–1
1
µA
OUTPUT OVERVOLTAGE PROTECTION
VOVP
OVP trip threshold
112.5% 115.0% 117.5%
tOVPDLY
OVP propagation delay
TA = 25°C
0.5
µs
OUTPUT UNDERVOLTAGE PROTECTION
VUVP
UVP trip Threshold
55%
60%
65%
tUVPDLY
UVP prop delay
250
µs
tUVPENDLY
UVP enable delay
From ENx ="Hi", VVREG5 = 5 V
1.35
ms
UVLO
Wake up
4.58
V
VUVL0VIN
VIN UVLO Threshold
Hysteresis
0.5
V
Wake up
4.38
4.50
V
VUVLO5
VREG5 UVLO Threshold
Hysteresis
0.4
V
Wake up
3.15
V
VUVLO3
VREG3 UVLO Threshold
Hysteresis
0.15
V
OVER TEMPERATURE PROTECTION
Shutdown temperature
155
TOTP
OTP threshold(1)
°C
Hysteresis
10
(1)
Ensured by design. Not production tested.
6
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Copyright © 2012–2013, Texas Instruments Incorporated


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