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TPS51220 Datasheet(PDF) 5 Page - Texas Instruments

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No. de pieza TPS51220
Descripción Electrónicos  Fixed Frequency, 99% Duty Cycle Peak Current Mode Notebook System Power Controller
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI - Texas Instruments

TPS51220 Datasheet(HTML) 5 Page - Texas Instruments

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TPS51220
SLVS785 – OCTOBER 2007
ELECTRICAL CHARACTERISTICS (continued)
over operating free-air temperature range, EN = 3.3V, VIN = 12V, V5SW = 5V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
CURRENT AMPLIFIER
TRIP = 0V/2V, CSN = 5V, TA = 25°C
(2)
3.333
GC
Gain
TRIP = 3.3V/5V, CSN = 5V, TA = 25°C
(2)
1.667
Common mode Input
VIC
0
13
V
Voltage Range
Differential Input Voltage
VID
TA = 25°C
–75
75
mV
Range
POWERGOOD
PG in from lower
92.5%
95%
97.5%
V(THPG)
PG threshold
PG in from higher
102.5%
105%
107.5%
PG hysteresis
5%
I(PG)
PG sink Current
PGOOD = 0.5 V
5
mA
t(PGDLY)
PGOOD Delay
Delay for PG in
0.8
1
1.2
ms
SOFTSTART
t(SSDYL)
Soft Start Delay
Delay for Soft Start, ENx = Hi to SS-ramp starts
140
μs
t(SS)
Soft Start Time
Internal Soft Start
800
μs
FREQUENCY AND DUTY CONTROL
f(SW)
Switching Frequency
Rf = 330 k
273
303
333
kHz
Lo to Hi
0.7
1.3
2
V
V(THRF)
RF Threshold
Hysteresis
0.2
V
Sync Input Frequency
f(SYNC)
200
1000
kHz
Range(2)
tONmin
Minimum On Time
V(DRVH) = 90% to 10%, No Load
120
150
ns
tOFFmin
Minimum Off Time
V(DRVH) = 10% to 90%, No Load
290
440
ns
DRVH-off to DRVL-on
10
30
50
ns
tD
Dead time
DRVL-off to DRVH-on
30
40
70
ns
V(DTH)
DRVH-off threshold
DRVH to GND (2)
1
V
V(DTL)
DRVL-off threshold
DRVL to GND(2)
1
V
OUTPUT DRIVERS
Source, V(VBST-DRVH) = 0.1 V
1.7
5
R(DRVH)
DRVH resistance
Sink, V(DRVH-SW) = 0.1 V
1
3
Source, V(VREG5-DRVL) = 0.1 V
1.3
4
R(DRVL)
DRVL resistance
Sink, V(DRVL-GND) = 0.1 V
0.7
2
CURRENT SENSE
TRIP = 0V/2V, TA = 25°C
27
31
35
Current limit threshold
V(OCL-ULV)
(ultra-low voltage)
TRIP = 0V/2V
25
31
37
mV
TRIP = 3.3V/5V, TA = 25°C
56
60
64
Current limit threshold
V(OCL-LV)
(low voltage)
TRIP = 3.3V/5V
54
60
66
Zero cross detection
V(ZC)
0.95V < CSNx < 12.6V
–4
0
4
mV
comparator Offset
Negative current limit
TRIP = 0V/2V, TA = 25°C
–24
–31
–38
V(OCLN-ULV)
threshold
TRIP = 0V/2V
–22
–31
–40
(ultra-low voltage)
mV
Negative current limit
TRIP = 3.3V/5V, TA = 25°C
–51
–60
–69
V(OCLN-LV)
threshold
TRIP = 3.3V/5V
–49
–60
–71
(low voltage)
(2)
Specified by design.
Copyright © 2007, Texas Instruments Incorporated
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