參數(shù)資料
型號(hào)： TPS54377RHF
廠商： Texas Instruments, Inc.
英文描述： 1.6 MHz, 3-V TO 6-V INPUT, 3-A SYNCHRONOUS STEP-DOWN SWIFT⑩ CONVERTER WITH DISABLED SINKING DURING START-UP
中文描述： 1.6兆赫，3 - V至6 V輸入，3甲同步降壓轉(zhuǎn)換器的SWIFT⑩與殘疾人沉井在啟動(dòng)期間
文件頁(yè)數(shù)： 12/21頁(yè)
文件大?。?/td> 593K
代理商： TPS54377RHF
www.ti.com
V = 50 mV/div
(AC Coupled)
PH = 2 V/div
500 ns / div
-0.2
3
4
5
O
-0.1
0.3
6
0.1
0
0.2
-0.3
V Input Voltage
V
I
= 0 A
O
I
= 1.5 A
O
I
= 3 A
O
0
10
20
30
50
40
60
80
70
90
100
120
110
130
0
0.5
1
1.5
2
2.5
3
TA
I
L
Load Current A
C
°
Safe Operating Area
Safe
board conditions listed in the dissipation
rating table section of this data sheet.
to the test
operating area is applicable
f = 700 kHz
V = 5 V
V
= 3.3 V
O
T = 125 C
o
DETAILED DESCRIPTION
Disabled Sinking During Start-Up (DSDS)
Undervoltage Lock Out (UVLO)
td
C(SS)
1.2 V
5
A
(2)
t(SS)
C(SS)
0.7 V
5
A
(3)
Slow-Start/Enable (SS/ENA)
TPS54377
SLVS779–SEPTEMBER 2007
T
A
= 25
°
C, f
s
= 1.1 MHz, V
I
= 3.3 V, V
O
= 1.8 V (unless otherwise specified)
AMBIENT TEMPERATURE
vs
LOAD CURRENT
LINE REGULATION
vs
INPUT VOLTAGE
INPUT RIPPLE VOLTAGE
Figure 19.
Figure 20.
Figure 21.
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-
μ
s falling edge deglitch
circuit reduce the likelihood of triggering the enable
due to noise.
The DSDS feature enables minimal voltage drooping
of output precharge capacitors at start-up. The
TPS54373
is
designed
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.
The second function of the SS/ENA pin provides an
external means of extending the slow-start time with
a low-value capacitor connected between SS/ENA
and AGND. Adding a capacitor to the SS/ENA pin
has two effects on start-up. First, a delay occurs
between release of the SS/ENA pin and start up of
the output. The delay is proportional to the slow-start
capacitor value and lasts until the SS/ENA pin
reaches the enable threshold. The start-up delay is
approximately:
to
disable
the
low-side
The TPS54377 incorporates an undervoltage 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-μs rising and falling
edge deglitch circuit reduce the likelihood of shutting
the device down due to noise on VIN.
Second, as the output becomes active, a brief
ramp-up at the internal slow-start rate may be
observed before the externally set slow-start rate
takes
control
and
the
proportional to the slow-start capacitor. The slow-start
time set by the capacitor is approximately:
output
rises
at
a
rate
The actual slow-start is likely to be less than the
above approximation due to the brief ramp-up at the
internal rate.
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
12
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Copyright 2007, Texas Instruments Incorporated
Product Folder Link(s):
TPS54377
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TPS54377RHFR 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 1.6 MHz 3-6V In 3A Syn. Stp Dwn SWIFT RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS54377RHFRG4 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 1.6 MHz 3V-6V Input 3A Syn. Step Down RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS54377RHFT 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 1.6 MHz 3-6V In 3A Syn. Stp Dwn SWIFT RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS54377RHFTG4 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 1.6 MHz 3V-6V Input 3A Syn. Step Down RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS54380 制造商:TI 制造商全稱:Texas Instruments 功能描述:SWIFT Converter Product Portfolio
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