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參數(shù)資料
| 型號： | TPS54673PWPR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 12 A SWITCHING REGULATOR, 762 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | GREEN, PLASTIC, HTSSOP-28 |
| 文件頁數(shù)： | 4/21頁 |
| 文件大?。?/td> | 570K |
| 代理商： | TPS54673PWPR |
TPS54673
SLVS433A SEPTEMBER 2002 REVISED FEBRUARY 2005
www.ti.com
12
Figure 16
40
0
10
40
60
100
1 k
10 k
100 k
1 M
120
60
30
120
180
f Frequency Hz
Gain
dB
LOOP RESPONSE
Phase
Degrees
30
20
10
20
30
50
150
60
90
0
30
90
Phase
Gain
Figure 17
25
35
45
55
65
75
85
95
105
115
125
01
234
56
78
Ambient
T
emperature
AMBIENT TEMPERATURE
vs
LOAD CURRENT
C°
IO Output Current A
TJ = 125°C
VI = 3.3 V
VI = 5 V
Safe Operating Area(1)
Figure 18
Time 1
s/div
OUTPUT RIPPLE VOLTAGE
Output
Ripple
V
oltage
10
mV/div
Figure 19
I = 1.5 A to 4.5 A
100
s/div
50
mV/div
LOAD TRANSIENT RESPONSE
2
A/div
Figure 20
5.0 ms/div
1
V/div
SLOW-START TIMING
VO = 2.5 V
VI = 3.3 V
RL = 2
(1) Safe operating area is applicable to the test board conditions in the Dissipation Ratings
DETAILED DESCRIPTION
DISABLED SINKING DURING START-UP
(DSDS)
The DSDS feature enables minimal voltage drooping of
output precharge capacitors at start-up. The TPS54673 is
designed to disable the low-side MOSFET to prevent
sinking current from a precharge output capacitor during
start-up. Once the high-side MOSFET has been turned on
to the maximum duty cycle limit, the low-side MOSFET is
allowed to switch. Once the maximum duty cycle condition
is met, the converter functions as a sourcing converter until
the SS/ENA is pulled low.
UNDERVOLTAGE LOCK OUT (UVLO)
The TPS54673 incorporates an under voltage lockout
circuit to keep the device disabled when the input voltage
(VIN) is insufficient. During power up, internal circuits are
held inactive until VIN exceeds the nominal UVLO
threshold voltage of 2.95 V. Once the UVLO start threshold
is reached, device start-up begins. The device operates
until VIN falls below the nominal UVLO stop threshold of
2.8 V. Hysteresis in the UVLO comparator and a 2.5-
s
rising and falling edge deglitch circuit reduce the likelihood
of shutting the device down due to noise on VIN.
SLOW-START/ENABLE (SS/ENA)
The slow-start/enable pin provides two functions. First, the
pin acts as an enable (shutdown) control by keeping the
device turned off until the voltage exceeds the start
threshold voltage of approximately 1.2 V. When SS/ENA
exceeds the enable threshold, device start-up begins. The
reference voltage fed to the error amplifier is linearly
ramped up from 0 V to 0.891 V in 3.35 ms. Similarly, the
converter
output
voltage
reaches
regulation
in
approximately 3.35 ms. Voltage hysteresis and a 2.5-
s
falling edge deglitch circuit reduce the likelihood of
triggering the enable due to noise.
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