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參數(shù)資料
| 型號： | TPS54233DG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2 A SWITCHING REGULATOR, 390 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 24/25頁 |
| 文件大?。?/td> | 789K |
| 代理商： | TPS54233DG4 |
EN
1.25V
VIN
+
-
Ren1
Ren2
1
A
m
3
A
m
START
STOP
V
- V
Ren1 =
3
A
m
EN
START
EN
V
Ren2 =
V
- V
+ 1
A
Ren1
m
(
)
(
)
( )
(
)
SS
ref
SS
C
nF
V
T
ms
=
I
A
m
SLUS859B
– OCTOBER 2008 – REVISED FEBRUARY 2011
ENABLE AND ADJUSTABLE INPUT UNDER-VOLTAGE LOCKOUT (VIN UVLO)
The EN pin has an internal pull-up current source that provides the default condition of the TPS54233 operating
when the EN pin floats.
The TPS54233 is disabled when the VIN pin voltage falls below internal VIN UVLO threshold. It is recommended
to use an external VIN UVLO to add Hysteresis unless VIN is greater than (VOUT + 2V). To adjust the VIN UVLO
with Hysteresis, use the external circuitry connected to the EN pin as shown in Figure 11. Once the EN pin
voltage exceeds 1.25V , an additional 3
μA of hysteresis is added. Use Equation 1 and Equation 2 to calculate
the resistor values needed for the desired VIN UVLO threshold voltages. The VSTART is the input start threshold
voltage, the VSTOP is the input stop threshold voltage and the VEN is the enable threshold voltage of 1.25 V. The
VSTOP should always be greater than 3.5 V.
Figure 11. Adjustable Input Undervoltage Lockout
(1)
(2)
PROGRAMMABLE SLOW START USING SS PIN
It is recommended to program the slow start time externally because no slow start time is implemented internally.
The TPS54233 effectively uses the lower voltage of the internal voltage reference or the SS pin voltage as the
power supply
’s reference voltage fed into the error amplifier and will regulate the output accordingly. A capacitor
(CSS) on the SS pin to ground implements a slow start time. The TPS54233 has an internal pull-up current
source of 2
μA that charges the external slow start capacitor. The equation for the slow start time (10% to 90%)
(3)
The slow start time should be set between 1ms to 10ms to ensure good start-up behavior. The slow start
capacitor should be no more than 27 nF.
If during normal operation, the input voltage drops below the VIN UVLO threshold, or the EN pin is pulled below
1.25 V, or a thermal shutdown event occurs, the TPS54233 stops switching.
ERROR AMPLIFIER
The TPS54233 has a transconductance amplifier for the error amplifier. The error amplifier compares the
VSENSE voltage to the internal effective voltage reference presented at the input of the error amplifier. The
transconductance of the error amplifier is 92
μA/V during normal operation. Frequency compensation
components are connected between the COMP pin and ground.
SLOPE COMPENSATION
To prevent the sub-harmonic oscillations when operating the device at duty cycles greater than 50%, the
TPS54233 adds a built-in slope compensation which is a compensating ramp to the switch current signal.
8
2008–2011, Texas Instruments Incorporated
Product Folder Link(s): TPS54233
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| TPS54233DR | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 28V,2A,300khZ Non- synch Buck RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| TPS54233DRG4 | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 28V,2A,300khZ Non- Synch Buck RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| TPS54233EVM-373 | 功能描述:電源管理IC開發(fā)工具 TPS54233EVM-373 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS54233-Q1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2-A, 28-V INPUT, STEP-DOWN DC/DC CONVERTER WITH ECO-MODEa?￠ |
| TPS54233QDRQ1 | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 AC 3.5-28Vin,2A 300kHz SD Converter RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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