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參數資料
| 型號： | TPS54980PWP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 16 A SWITCHING REGULATOR, 762 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | GREEN, PLASTIC, HTSSOP-28 |
| 文件頁數： | 6/21頁 |
| 文件大小： | 568K |
| 代理商： | TPS54980PWP |
TPS54980
SLVS452A FEBRUARY 2003 REVISED FEBRUARY 2005
www.ti.com
14
the oscillator pulse signals the control logic to turn the
high-side FET off and the low-side FET on. The device
operates at its maximum duty cycle until the output voltage
rises to the regulation set-point, setting VSENSE to
approximately the same voltage as VREF. If the error
amplifier output is low, the PWM latch is continually reset
and the high-side FET does not turn on. The low-side FET
remains on until the VSENSE voltage decreases to a
range that allows the PWM comparator to change states.
The TPS54980 is capable of sinking current continuously
until the output reaches the regulation set-point.
If the current limit comparator trips for longer than 100 ns,
the PWM latch resets before the PWM ramp exceeds the
error amplifier output. The high-side FET turns off and
low-side FET turns on to decrease the energy in the output
inductor and consequently the output current. This
process is repeated each cycle in which the current limit
comparator is tripped.
DEAD-TIME CONTROL AND MOSFET
DRIVERS
Adaptive dead-time control prevents shoot-through
current from flowing in both N-channel power MOSFETs
during the switching transitions by actively controlling the
turnon times of the MOSFET drivers. The high-side driver
does not turn on until the voltage at the gate of the low-side
FET is below 2 V. While the low-side driver does not turn
on until the voltage at the gate of the high-side MOSFET
is below 2 V.
The high-side and low-side drivers are designed with
300-mA source and sink capability to quickly drive the
power MOSFETs gates. The low-side driver is supplied
from VIN, while the high-side drive is supplied from the
BOOT pin. A bootstrap circuit uses an external BOOT
capacitor and an internal 2.5-
bootstrap switch
connected between the VIN and BOOT pins. The
integrated bootstrap switch improves drive efficiency and
reduces external component count.
OVERCURRENT PROTECTION
The cycle-by-cycle current limiting is achieved by sensing
the current flowing through the high-side MOSFET and
comparing this signal to a preset overcurrent threshold.
The high side MOSFET is turned off within 200 ns of
reaching the current limit threshold. A 100-ns leading edge
blanking circuit prevents the current limit from false
tripping. Current limit detection occurs only when current
flows from VIN to PH when sourcing current to the output
filter. Load protection during current sink operation is
provided by thermal shutdown.
THERMAL SHUTDOWN
The device uses the thermal shutdown to turn off the power
MOSFETs and disable the controller if the junction
temperature exceeds 150
°C. The device is released from
shutdown automatically when the junction temperature
decreases to 10
°C below the thermal shutdown trip point,
and starts up under control of the slow-start circuit.
Thermal shutdown provides protection when an overload
condition is sustained for several milliseconds. With a
persistent fault condition, the device cycles continuously;
starting up by control of the soft-start circuit, heating up due
to the fault condition, and then shutting down upon
reaching the thermal shutdown trip point. This sequence
repeats until the fault condition is removed.
POWER-GOOD (PWRGD)
The power good circuit monitors for undervoltage
conditions on VSENSE. If the voltage on VSENSE is 10%
below the reference voltage, the open-drain PWRGD
output is pulled low. PWRGD is also pulled low if VIN is
less than the UVLO threshold or ENA is low, or a thermal
shutdown occurs. When VIN
≥ UVLO threshold, ENA ≥
enable threshold, and VSENSE > 90% of Vref, the open
drain output of the PWRGD pin is high. A hysteresis
voltage equal to 3% of Vref and a 35 s falling edge deglitch
circuit prevent tripping of the power good comparator due
to high frequency noise.
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| TPS54980PWPG4 | 功能描述:直流/直流開關調節(jié)器 3.3V Input Synch Buck Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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| TPS54980PWPRG4 | 功能描述:直流/直流開關調節(jié)器 3.3V Inp Sync Buck Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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| TPS549A20RVET | 功能描述:Buck Switching Regulator IC Positive Adjustable 0.6V 1 Output 15A 28-VFQFN Exposed Pad 制造商:texas instruments 系列:SWIFT?，D-CAP3?，Eco-Mode? 包裝:剪切帶（CT） 零件狀態(tài):有效 功能:降壓 輸出配置:正 拓撲:降壓 輸出類型:可調式 輸出數:1 電壓 - 輸入（最小值）:1.5V 電壓 - 輸入（最大值）:20V 電壓 - 輸出（最小值/固定）:0.6V 電壓 - 輸出（最大值）:5.5V 電流 - 輸出:15A 頻率 - 開關:可選 同步整流器:是 工作溫度:-40°C ~ 125°C（TA） 安裝類型:表面貼裝 封裝/外殼:28-VFQFN 裸露焊盤 供應商器件封裝:28-VQFN（4.5x3.5） 標準包裝:1 |
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