參數(shù)資料
型號(hào)： TPS61141DRCT
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： 1.26 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO10
封裝： 3 X 3 MM, GREEN, PLASTIC, QFN-10
文件頁(yè)數(shù)： 3/25頁(yè)
文件大?。?/td> 776K
代理商： TPS61141DRCT
www.ti.com
DETAILED DESCRIPTION
VOLTAGE OUTPUT MODE
Vout=VFBx
R2
(R1+ R2)
(1)
CURRENT OUTPUT MODE
I
O +
V
ISET
R
SET
K
ISET
(2)
SLVS624B – JANUARY 2006 – REVISED MARCH 2007
The TPS61140/1 uses a single boost converter to provide pre-regulated power for the device’s current output
and voltage output. The current output is regulated by a low side current sink connected to the IFB pin, while a
low dropout linear regulator (LDO) on the output of the boost regulator provides the voltage output. The LDO is
used for its low ripple and fast transient response. The device automatically sets the boost output voltage to
minimize power losses of the linear circuits (i.e., the current sink and LDO), and yet provide enough headroom
for their dc operation and transient response. Such an implementation takes advantage of the high quality output
of linear circuits, while maintaining high efficiency offered by the boost converter.
When only the voltage output is enabled (i.e., SELV high and SELI low), LDO pass element Q2, shown in the
block diagram, regulates Vout per the external resistor divider connected to the VFB pin. Current sink Q3 turns
off, thereby opening the current path. The boost converter operates in PFM (pulse frequency modulation) mode
for high efficiency over a wide load range. Operating in PFM mode, the device turns on the power switch Q1
when the voltage drop across the LDO (i.e., V(IOUT)–VOUT) falls below the regulation voltage (Vdelta). The input
voltage is applied across the inductor, and its current linearly increases until reaching current limit, upon which
Q1 is turned off. At this time, the built-in power diode is then forward biased and releases the inductor energy to
the output. After the minimum off time, Q1 is allowed to turn back on again only if the voltage across the LDO is
still below the threshold. Otherwise, Q1 stays off to reduce the switching losses and IC quiescent current. The
minimum off time ensures discontinuous operation (DCM) in which inductor current always ramps down to zero
in each switching cycle. DCM operation is required for feedback loop stability. There is also a maximum Q1 on
time which turns off Q1 even if the current is still below the current limiting threshold. By minimizing the voltage
drop across the LDO, the LDO maintains high efficiency. For 15V output, the LDO accounts for approximately
2% of efficiency loss.
Because PFM control reduces the switch frequency at light load, the boost regulator produces higher output
ripple. Fortunately, the LDO’s high PSRR (power supply rejection ratio) attenuates the ripple on the VOUT pin
for optimal OLED display performance.
The output voltage of the Vout pin can be programmed by the resistor divider connected to the VFB pin, as
shown in the Typical Application.
Where VFB = reference voltage of the VFB pin
When only the current output is selected (i.e., SELV low and SELI high), the LDO, and therefore VOUT is turned
off, and the current sink device Q3, shown in the block diagram, regulates the current output. The boost
converter uses fixed frequency PWM control to provide high output current and low output ripple noises. In this
mode, the feedback loop regulates the IFB pin to a threshold voltage (VIFB), giving current sink circuit minimum
headroom to operate and minimizing losses across the current sink circuit.
The regulation current is set by the resistor on the Iset pin based on
where
IO = output current
VISET = Iset pin voltage (1.229V typical)
RSET = Iset pin resistor value
KISET = current multiplier (900 typical)
11
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TPS61150 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:DUAL OUTPUT BOOST WLED DRIVER USING SINGLE INDUCTOR
TPS61150A 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:DUAL OUTPUT BOOST WLED DRIVER USING SINGLE INDUCTOR
TPS61150ADRCR 功能描述:LED照明驅(qū)動(dòng)器 Dual Output Boost WLED Driver RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N
TPS61150ADRCRG4 功能描述:LED照明驅(qū)動(dòng)器 Dual Output Boost WLED Driver RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N
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