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| 型号： | TPS54240DGQ |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | GREEN, PLASTIC, MSOP-10 |
| 文件页数： | 7/48页 |
| 文件大小： | 1759K |
| 代理商： | TPS54240DGQ |
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START
STOP
OUT
HYS
V
R1
V
I
R3
-
=
+
ENA
START
ENA
1
V
R2
V
I
R1
R3
=
-
+
-
Tss(ms)
Iss( A)
Css(nF) =
Vref (V)
0.8
m
EN
SS/TR
V
SENSE
VOUT
www.ti.com
SLVSAA6 – APRIL 2010
DETAILED DESCRIPTION (continued)
(4)
(5)
Slow Start/Tracking Pin (SS/TR)
The TPS54240 effectively uses the lower voltage of the internal voltage reference or the SS/TR pin voltage as
the power-supply's reference voltage and regulates the output accordingly. A capacitor on the SS/TR pin to
ground implements a slow start time. The TPS54240 has an internal pull-up current source of 2mA that charges
the external slow start capacitor. The calculations for the slow start time (10% to 90%) are shown in Equation 6.
The voltage reference (VREF) is 0.8 V and the slow start current (ISS) is 2mA. The slow start capacitor should
remain lower than 0.47mF and greater than 0.47nF.
(6)
At power up, the TPS54240 will not start switching until the slow start pin is discharged to less than 40 mV to
ensure a proper power up, see Figure 29.
Also, during normal operation, the TPS54240 will stop switching and the SS/TR must be discharged to 40 mV,
when the VIN UVLO is exceeded, EN pin pulled below 1.25V, or a thermal shutdown event occurs.
The VSENSE voltage will follow the SS/TR pin voltage with a 45mV offset up to 85% of the internal voltage
reference. When the SS/TR voltage is greater than 85% on the internal reference voltage the offset increases as
the effective system reference transitions from the SS/TR voltage to the internal voltage reference (see
Figure 23). The SS/TR voltage will ramp linearly until clamped at 1.7V.
Figure 29. Operation of SS/TR Pin when Starting
Copyright 2010, Texas Instruments Incorporated
15
Product Folder Link(s): TPS54240
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| TPS54240DGQ | 制造商:Texas Instruments 功能描述:IC STEP-DOWN DC/DC CONVERTER MSOP-10 |
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| TPS54240EVM-605 | 功能描述:电源管理IC开发工具 2.5A SWIFT Converter 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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