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參數(shù)資料
| 型號(hào)： | TCV7104FN |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 3 X 3 MM, 0.65 MM PITCH, PLASTIC, SON-8 |
| 文件頁(yè)數(shù)： | 14/16頁(yè) |
| 文件大?。?/td> | 272K |
| 代理商： | TCV7104FN |
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TCV7104FN
2010-03-23
7
Output Filter Capacitor Selection
Use a low-ESR electrolytic or ceramic capacitor as the output filter capacitor. Since a capacitor is generally
sensitive to temperature, choose one with excellent temperature characteristics. As a rule of thumb, its
capacitance should be 10
μF or greater for applications. The capacitance should be set to an optimal value that
meets the system’s ripple voltage requirement and transient load response characteristics. The phase margin
tends to decrease as the output voltage is getting low. Enlarge a capacitance for output flatness when phase
margin is insufficient, or the transient load response characteristics cannot be satisfied. Since the ceramic
capacitor has a very low ESR value, it helps reduce the output ripple voltage; however, because the ceramic
capacitor provides less phase margin, it should be thoroughly evaluated.
Soft-Start Feature
The TCV7104FN has a soft-start feature.
If the SS pin is left open, the soft-start time, tSS, for VOUT defaults to 1 ms (typ.) internally.
The soft-start time can be extended by adding an external capacitor (CSS) between the SS and SGND pins. The
soft-start time can be calculated as follows:
SS
SS2
C
1
.
0
t
=
(4)
tSS2: Soft-start time (in seconds) when an external capacitor is
connected between SS and SGND.
CSS: Capacitor value (μF)
The soft-start feature is activated when the TCV7104FN exits the undervoltage lockout (UVLO) state after
power-up and when the voltage at the EN pin has changed from logic low to logic high.
Overcurrent Protection（OCP）
The TCV7104FN has maximum current limiting. The TCV7104FN limits the ON time of high side switching
transistor and decreases output voltage when the peak value of the LX terminal current exceeds switching
terminal peak current limitation ILIM=3.2A(typ.).
Undervoltage Lockout (UVLO)
The TCV7104FN has undervoltage lockout (UVLO) protection circuitry. The TCV7104FN does not provide
output voltage (VOUT) until the input voltage (VIN2) has reached VUVR (2.55 V typ.). UVLO has hysteresis of 0.1
V (typ.). After the switch turns on, if VIN2 drops below VUV (2.45 V typ.), UVLO shuts off the switch at VOUT.
Figure 4 Undervoltage Lockout Operation
Soft start
VIN2
Hysteresis:
ΔVUV
Undervoltage lockout
detection voltage VUV
Switching operation
stops
GND
VOUT
GND
Undervoltage lockout
recovery voltage VUVR
Switching operation starts
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| TCV7104FN(TE85L,F) | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 2.7 to 5.5V 1500kHz 2A 1Ch DC DC Conv RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)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 |
| TCV7105F | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:Buck DC-DC Converter IC |
| TCV7106FN | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:Buck DC-DC Converter IC |
| TCV7106FN(TE85L,F) | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 2.7 to 5.5V 550kHz 2.5A at 3.3V .12 Ohm RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)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 |
| TCV7107F | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:Buck DC-DC Converter IC |
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