參數(shù)資料
型號(hào)： TPS51020DBTR
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 450 kHz SWITCHING FREQ-MAX, PDSO30
封裝： GREEN, PLASTIC, TSSOP-30
文件頁(yè)數(shù)： 25/29頁(yè)
文件大小： 672K
代理商： TPS51020DBTR
TPS51020
SLUS564C JULY 2003 REVISED OCTOBER 2008
5
www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
TA = 40°C to 85°C, 4.5 V < VIN < 20 V, CVIN = 0.1 F, CVREG5 = 2.2 F, CREF_X = 0.01 F, PGOOD = 0.2 V, ENBLx = DDR = VIN,
INVx = COMPx, RSSTRTx = OPEN, TRIP1 = TRIP2 = VIN, LLx = GND, VBSTx = LLx+5, C(OUTx_U, OUTx_D)=1 nF, REG5_IN = 0V, GND =
OUTGNDx = 0 V, VO1_VDDQ = VO2 = 0 V (unless otherwise stated)
PARAMETER
UNIT
MAX
TYP
MIN
TEST CONDITIONS
0.85-V REFERENCE CONTROL LOOP
VREFCH1
Error amplifier reference, channel 1 initial
accuracy
Measure COMP1,
COMP1= INV1,
TA = 25°C
0.84
0.85
0.86
V
VREFTC1
Error amplifier reference, channel 1
change with accuracy
0.5%
VREFLN1
Error amplifier reference, channel 1
change with line
0.1%
VCHMM
Channel 2 to channel 1 voltage mismatch
0
|5.0|
mV
CONTROL LOOP: SKIP HYSTERSTIC COMPARATOR AND ZERO CURRENT COMPARATOR
VLLHYS
Skip hysteresis comparator hysteresis(1)
1
2
3
VLLOFF
Lload hysteresis comparator offset(1)
0
1
mV
VZOFF
Zero current comparator offset(1)
10
18
mV
THLTOLL
PWM skip delay time
8
clks
THLTOHL
Skip to PWM delay time
1
clks
CONTROL LOOP ERROR AMPLIFIER
IEASRC
COMPx source current
0.2
0.9
mA
IEASNK
COMPx sink current
0.2
0.7
mA
FUGB
Unity gain bandwidth(1)
2.5
MHz
AOL
Open loop gain(1)
80
dB
CMRCOMP
COMPx voltage range(1)(6)
0.4
VREG53
V
IINVLEAK
INVx input current
|0.5|
A
CONTROL LOOP: DUTY CYCLE, VOLTAGE RAMP, CHANNEL PHASE AND PWM DELAY PATH
fOSC = 270 kHz(3)
86%
88%
DCMAX
Maximum duty cycle
fOSC = 360 kHz
84%
85%
DCMAX
Maximum duty cycle
fOSC = 450 kHz(2)
80%
82%
PHCH
Channel to channel phase difference(5)
PWM phase reversal only
180
°
TMIN
OUTX_U minimum pulse width(1)
100
ns
TIMERS: INTERNAL OSCILLATOR(4)
fOSC(hi)
Fast oscillator frequency initial accuracy(2)
RSSTRTx = OPEN
450
fOSC(lo)
Slow oscillator frequency initial accuracy
RSSTRTx = 1M or VSSTRT = 3 V
270
kHz
fOSC(tc)
Oscillator frequency over line and temperature
Trimmed for 360 kHz
306
360
414
kHz
(1) Ensured by design. Not production tested.
(2) Maximum 450-kHz frequency can be achieved when both channels are enabled.
(3) 270 kHz is the default frequency during start-up for both channels.
(4) See Table 1.
(5) See PWM detailed description
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