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TPS54872PWP 데이터시트(PDF) 3 Page - Texas Instruments

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부품명 TPS54872PWP
상세설명  8-A OUTPUT, 4-V TO 6-V INPUT TRACKING/TERMINATION SYNCHRONOUS PWM SWITCHER WITH INTEGRATED FETs
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홈페이지  http://www.ti.com
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TPS54872
SLVS436C − JULY 2002 − REVISED FEBRUARY 2005
www.ti.com
3
ELECTRICAL CHARACTERISTICS
TJ = –40°C to 125°C, VI = 4 V to 6 V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
SUPPLY VOLTAGE, VIN
VIN
Input voltage range
4.0
6.0
V
fs = 350 kHz, RT open, PH pin open
11
15.8
I(Q)
Quiescent current
fs = 500 kHz, RT = 100 kΩ, PH pin open
16
23.5
mA
I(Q)
Quiescent current
Shutdown, SS/ENA = 0 V
1
1.4
mA
UNDER VOLTAGE LOCK OUT
Start threshold voltage, UVLO
3.80
3.85
V
Stop threshold voltage, UVLO
3.40
3.50
V
Hysteresis voltage, UVLO
0.14
0.16
V
Rising and falling edge deglitch, UVLO(1)
2.5
µs
BIAS VOLTAGE
Output voltage, VBIAS
I(VBIAS) = 0
2.70
2.80
2.90
V
Output current, VBIAS (2)
100
µA
REGULATION
Line regulation(1)(3)
IL = 4 A, fs = 350 kHz, TJ = 85°C
0.04
%/V
Load regulation(1)(3)
IL = 0 A to 8 A, fs = 350 kHz, TJ = 85°C
0.03
%/A
OSCILLATOR
Internally set free running frequency
RT open
280
350
420
kHz
RT = 180 k
Ω (1% resistor to AGND)
252
280
308
Externally set free running frequency range
RT = 100 k
Ω (1% resistor to AGND)
460
500
540
kHz
Externally set free running frequency range
RT = 68 k
Ω (1% resistor to AGND)
663
700
762
kHz
Ramp valley(1)
0.75
V
Ramp amplitude (peak-to-peak)(1)
1
V
Minimum controllable on time(1)
200
ns
Maximum duty cycle(1)
90%
ERROR AMPLIFIER
Error amplifier open loop voltage gain
1 k
Ω COMP to AGND(1)
90
110
dB
Error amplifier unity gain bandwidth
Parallel 10 k
Ω, 160 pF COMP to AGND(1)
3
5
MHz
Error amplifier common mode input voltage range
Powered by internal LDO(1)
0
VBIAS
V
Input bias current, VSENSE
VSENSE = Vref
60
250
nA
Output voltage slew rate (symmetric), COMP
1.0
1.4
V/
µs
PWM COMPARATOR
PWM comparator propagation delay time,
PWM comparator input to PH pin
(excluding deadtime)
10-mV overdrive(1)
70
85
ns
(1) Specified by design
(2) Static resistive loads only
(3) Specified by the circuit used in Figure 8


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