參數(shù)資料
型號(hào)： TPS54283PWPR
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 3.6 A DUAL SWITCHING CONTROLLER, 375 kHz SWITCHING FREQ-MAX, PDSO14
封裝： GREEN, PLASTIC, HTSSOP-14
文件頁(yè)數(shù)： 4/52頁(yè)
文件大?。?/td> 1110K
代理商： TPS54283PWPR
www.ti.com
APPLICATION INFORMATION
FUNCTIONAL DESCRIPTION
Voltage Reference
Oscillator
Input Undervoltage Lockout (UVLO) and Startup
Enable and Timed Turn On of the Outputs
SLUS749C – JULY 2007 – REVISED OCTOBER 2007
The TPS54283 and TPS54286 are dual output non-synchronous converters. Each PWM channel contains an
internally-compensated error amplifier, current mode pulse width modulator (PWM), switch MOSFET, enable,
and fault protection circuitry. Common to the two channels are the internal voltage regulator, voltage reference,
clock oscillator, and output voltage sequencing functions.
DESIGN HINT
The TPS5428x contains internal slope compensation and loop compensation
components; therefore, the external L-C filter must be selected appropriately so that
the resulting control loop meets criteria for stability. This approach differs from an
externally-compensated controller, where the L-C filter is generally selected first, and
the compensation network is found afterwards. (See Feedback Loop and L-C Filter
Selection section.)
NOTE:
Unless otherwise noted, the term TPS5428x applies to both the TPS54283 and
TPS54286. Also, unless otherwise noted, a label with a lowercase x appended implies
the term applies to both outputs of the two modulator channels. For example, the term
ENx implies both EN1 and EN2. Unless otherwise noted, all parametric values given
are typical. Refer to the Electrical Characteristics for minimum and maximum values.
Calculations should be performed with tolerance values taken into consideration.
The bandgap cell common to both outputs, trimmed to 800 mV.
The oscillator frequency is internally fixed at two times the SWx node switching frequency. The two outputs are
internally configured to operate on alternating switch cycles (that is, 180
° out of phase).
When the voltage at the PVDD2 pin is less than 4.1 V, a portion of the internal bias circuitry is operational, and
all other functions are held OFF. All of the internal MOSFETs are also held OFF. When the PVDD2 voltage rises
above the UVLO turn-on threshold, the state of the enable pins determines the remainder of the internal startup
sequence. If either output is enabled (ENx pulled low), the BP regulator turns on, charging the BP capacitor with
a 20 mA current. When the BP pin is greater than 4 V, PWM is enabled and soft start begins, depending on the
SEQ mode of operation and the EN1 and EN2 settings.
Note that the internal regulator and control circuitry are powered from PVDD2. The voltage on PVDD1 may be
higher or lower than PVDD2. (See the Dual Supply Operation section.)
Each output has a dedicated (active low) enable pin. If left floating, an internal current source pulls the pin to
PVDD2. By grounding, or by pulling the ENx pin to below approximately 1.2 V with an external circuit, the
associated output is enabled and soft start is initiated.
If both enable pins are left in the high state, the device operates in a shutdown mode, where the BP regulator is
shut down and minimal functions are active. The total standby current from both PVDD pins is approximately
70
A at 12-V input supply.
12
Copyright 2007, Texas Instruments Incorporated
Product Folder Link(s): TPS54283 TPS54286
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TPS54283PWPRG4 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 2A Non-Synch Buck Converter 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
TPS54286 制造商:TI 制造商全稱:Texas Instruments 功能描述:SWIFT Converter Product Portfolio
TPS54286PWP 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 2A Non-Synch Buck Converter 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
TPS54286PWPG4 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 2A Non-Synch Buck Converter 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
TPS54286PWPR 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 2A Dual Non-Synch Buck Conv 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
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