參數(shù)資料
型號(hào)： TPS51221RTVRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 333 kHz SWITCHING FREQ-MAX, PQCC32
封裝： 5 X 5 MM, GREEN, PLASTIC, QFN-32
文件頁(yè)數(shù)： 36/39頁(yè)
文件大?。?/td> 829K
代理商： TPS51221RTVRG4
SLVS786A – NOVEMBER 2007 – REVISED MARCH 2009............................................................................................................................................... www.ti.com
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%
VTHPG
PG threshold
PG in from higher
102.5%
105%
107.5%
PG hysteresis
5%
IPG
PG sink current
PGOOD = 0.5 V
5
mA
tPGDLY
PGOOD Delay
Delay for PG in
0.8
1
1.2
ms
SOFTSTART
tSSDYL
Soft start delay
Delay for Soft Start, ENx=Hi to SS-ramp starts
200
s
tSS
Soft start time
Internal soft start
960
s
FREQUENCY AND DUTY CONTROL
fSW
Switching frequency
Rf = 330 k
273
303
333
kHz
Lo to Hi
0.7
1.3
2.0
V
VTHRF
RF threshold
Hysteresis
0.2
V
Sync input frequency
fSYNC
Specified by design
200
1000
kHz
range
tONMIN
Minimum on-time
VDRVH = 90% to 10%, No Load
120
150
ns
tOFFMIN
Minimum off-time
VDRVH = 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
VDTH
DRVH-off threshold
DRVH to GND (2)
1.0
V
VDTL
DRVL-off threshold
DRVL to GND(2)
1.0
V
OUTPUT DRIVERS
Source, VVBST-DRVH = 0.1 V
1.7
5.0
RDRVH
DRVH resistance
Sink, VDRVH-SW = 0.1 V
1.0
3.0
Source, VV5IN-DRVL = 0.1 V
1.3
4.0
RDRVL
DRVL resistance
Sink, VDRVL-PGND = 0.1 V
0.7
2.0
CURRENT SENSE
TRIP = 0V/2V, TA = 25°C
27
31
35
Current limit threshold
VOCL-ULV
mV
(Ultra low voltage)
TRIP = 0V/2V
25
31
37
TRIP = 3.3V/5V, TA = 25°C
56
60
64
Current limit threshold
VOCL-LV
mV
( low voltage)
TRIP = 3.3V/5V
54
60
66
Zero cross detection
VZC
0.95V < CSNx < 12.6V
–4
0
4
mV
comparator offset
TRIP = 0V/2V, TA = 25°C
–24
–31
–38
Negative current limit
VOCLN-ULV
mV
threshold (ULV)
TRIP = 0V/2V
–22
–31
–40
TRIP = 3.3V/5V, TA = 25°C
–51
–60
–69
Negative current limit
VOCLN-LV
mV
threshold (LV)
TRIP = 3.3V/5V
–49
–60
–71
(2)
Specified by design.
6
Copyright 2007–2009, Texas Instruments Incorporated
Product Folder Link(s): TPS51221
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