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参数资料
| 型号： | TPS54233DG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING REGULATOR, 390 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件页数： | 24/25页 |
| 文件大小： | 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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| TPS54233EVM-373 | 功能描述:电源管理IC开发工具 TPS54233EVM-373 Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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| TPS54233QDRQ1 | 功能描述:开关变换器、稳压器与控制器 AC 3.5-28Vin,2A 300kHz SD Converter RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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