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| 型号： | TPS54550PWPRG4 |
| 厂商： | Texas Instruments |
| 文件页数： | 11/31页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 6A 16HTSSOP |
| 产品培训模块： | Understanding SWIFT Step Down Dc/Dc Converters |
| 标准包装： | 2,000 |
| 系列： | SWIFT™ |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.9 V ~ 12 V |
| 输入电压： | 4.5 V ~ 20 V |
| 频率 - 开关： | 250kHz，500kHz |
| 电流 - 输出： | 6A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-HTSSOP |
| 配用： | 296-19743-ND - EVALUATION MODULE FOR TPS54550 |
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PWM Control and Feed Forward
Signals from the error amplifier output, oscillator, and
current limit circuit are processed by the PWM
the control logic includes the PWM comparator,
PWM latch, and the adaptive dead-time control logic.
During steady-state operation below the current limit
threshold, the PWM comparator output and oscillator
pulse train alternately reset and set the PWM latch.
Once the PWM latch is reset, the low-side driver and
integrated pull-down MOSFET remain on for a
minimum duration set by the oscillator pulse width.
During this period, the PWM ramp discharges rapidly
to the valley voltage. When the ramp begins to
charge back up, the low-side driver turns off and the
high-side FET turns on. The peak PWM ramp
voltage varies inversely with input voltage to maintain
a constant modulator and power stage gain of 8 V/V.
As the PWM ramp voltage exceeds the error
amplifier output voltage, the PWM comparator resets
the latch, thus turning off the high-side FET and
turning on the low-side FET. The low-side driver
remains on until the next oscillator pulse discharges
the PWM ramp.
During transient conditions, the error amplifier output
can be below the PWM ramp valley voltage or above
the PWM peak voltage. If the error amplifier is high,
the PWM latch is never reset and the high-side FET
remains on until the oscillator pulse signals the
control logic to turn the high-side FET off and the
internal low-side FET and driver 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 the
internal voltage reference. If the error amplifier output
is low, the PWM latch is continually reset and the
high-side FET does not turn on. The internal low-side
FET and low-side driver remain on until the VSENSE
voltage decreases to a range that allows the PWM
comparator to change states. The TPS54550 is
capable of sinking current through the external
low-side FET until the output voltage reaches the
regulation set point.
SLVS623A – MARCH 2006 – REVISED APRIL 2006
The minimum on time is designed to be 180 ns.
During the internal slow-start interval, the internal
reference ramps from 0 V to 0.891 V. During the
initial slow-start interval, the internal reference
voltage is very small, resulting in a couple of skipped
pulses because the minimum on time causes the
actual output voltage to be slightly greater than the
preset output voltage until the internal reference
ramps up.
Dead-time Control
Adaptive dead-time control prevents shoot-through
current from flowing in the integrated high-side
MOSFET and the external low-side MOSFET during
the switching transitions by actively controlling the
turn on times of the drivers. The high-side driver
does not turn on until the voltage at the gate of the
low-side MOSFET is below 1 V. The low-side driver
does not turn on until the voltage at the gate of the
high-side MOSFET is below 1 V.
Low Side Gate Driver (LSG)
LSG is the output of the low-side gate driver. The
100-mA MOSFET driver is capable of providing gate
drive for most popular MOSFETs suitable for this
application. Use the SWIFT Designer Software Tool
to find the most appropriate MOSFET for the
application. Connect the LSG pin directly to the gate
of the low-side MOSFET. Do not use a gate resistor
as the resulting turn-on time may be too slow.
Thermal Shutdown
The device uses the thermal shutdown to turn off the
MOSFET drivers and controller if the junction
temperature exceeds +165 ° C. The device is
restarted automatically when the junction
temperature decreases to 7 ° C below the thermal
shutdown trip point and starts up under control of the
slow-start circuit.
11
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