參數(shù)資料
型號(hào)： TPS40304DRCR
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 660 kHz SWITCHING FREQ-MAX, PDSO10
封裝： 3 X 3 MM, GREEN, PLASTIC, SON-10
文件頁數(shù)： 4/31頁
文件大?。?/td> 1798K
代理商： TPS40304DRCR
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( )
P P
OCLOS
OUT max
DS on
OCSET
I
R
V
2
R
2
I
-
-
-
÷
÷
÷
è
÷
è
=
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SLUS964 – NOVEMBER 2009
www.ti.com
OCP sensing at LDRV is a true inductor valley current detection, using sample and hold. Equation 2 can be used
to calculate ROCSET:
(2)
where
IOCSET is the internal current source
VOCLOS is the overall offset voltage
IP-P is the peak-to-peak inductor current
RDS(on) is the drain to source on-resistance of the low-side FET
IOUT(max) is the trip point for OCP
ROCSET is the resistor used for setting the OCP level
To avoid over-current tripping in normal operating load range, calculate ROCSET using the equation above with:
The maximum RDS(ON) at room temperature
The lower limit of VOCLOS (–8 mV) and the lower limit of IOCSET (9.5 A) from the Electrical Characteristics
table.
The peak-to-peak inductor current IP-P at minimum input voltage
Overcurrent is sensed across both the low-side FET and the high-side FET. If the voltage drop across either FET
exceeds the OC threshold, a count increments one count. If no OC is detected on either FET, the fault counter
decrements by one count. If three OC pulses are summed, a fault condition is declared which cycles the
soft-start function in a hiccup mode. Hiccup mode consists of four dummy soft-start timeouts followed by a real
one if overcurrent condition is encountered during normal operation, or five dummy soft-start timeouts followed
by a real one if overcurrent condition occurs from the beginning during start. This cycle continues indefinitely until
the fault condition is removed.
Drivers
The drivers for the external high-side and low-side MOSFETs are capable of driving a gate-to-source voltage of
VBP. The LDRV driver for the low-side MOSFET switches between BP and GND, while HDRV driver for the
high-side MOSFET is referenced to SW and switches between BOOT and SW. The drivers have
non-overlapping timing that is governed by an adaptive delay circuit to minimize body diode conduction in the
synchronous rectifier.
Pre-Bias Startup
The TPS4030x contains a circuit to prevent current from being pulled from the output during startup in the
condition the output is pre-biased. There are no PWM pulses until the internal soft-start voltage rises above the
error amplifier input (FB pin), if the output is pre-biased. Once the soft-start voltage exceeds the error amplifier
input, the controller slowly initiates synchronous rectification by starting the synchronous rectifier with a narrow
on time. It then increments that on time on a cycle-by-cycle basis until it coincides with the time dictated by (1-D),
where D is the duty cycle of the converter. This approach prevents the sinking of current from a pre-biased
output, and ensures the output voltage startup and ramp to regulation is smooth and controlled.
12
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s) :TPS40303 TPS40304 TPS40305
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參數(shù)描述
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TPS40304DRCT 制造商:Texas Instruments 功能描述:Synchronous Buck Controller IC 制造商:Texas Instruments 功能描述:IC, SYNC BUCK CONTROLLER, SON-10
TPS40304EVM-353 功能描述:電源管理IC開發(fā)工具 Eval with NexFET Pwr MOSFETs RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
TPS40305 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-V TO 20-V INPUT SYNCHRONOUS BUCK CONTROLLER
TPS40305DRCR 功能描述:DC/DC 開關(guān)控制器 3-20V Wide Input Sync Buck Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
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