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| 型号： | TPS61085PW |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | GREEN, PLASTIC, TSSSOP-8 |
| 文件页数： | 4/25页 |
| 文件大小： | 781K |
| 代理商： | TPS61085PW |
Output Capacitor Selection
Frequency Select Pin (FREQ)
Undervoltage Lockout (UVLO)
Thermal Shutdown
SLVS859 – JUNE 2008 ...................................................................................................................................................................................................... www.ti.com
For best output voltage filtering a low ESR output capacitor like ceramic capcaitor is recommended. Two 10
F
ceramic output capacitors (or one 22
F) work for most of the applications. Higher capacitor values can be used
to improve the load transient response. Refer to Table 4 for the selection of the output capacitor.
Table 4. Rectifier Input and Output Capacitor Selection
CAPACITOR
VOLTAGE RATING
SUPPLIER
COMPONENT CODE
CIN
10
F/1206
16 V
Taiyo Yuden
EMK212 BJ 106KG
IN bypass
1
F/0603
16 V
Taiyo Yuden
EMK107 BJ 105KA
COUT
10
F/1206
25 V
Taiyo Yuden
TMK316 BJ 106KL
The frequency select pin FREQ allows to set the switching frequency of the device to 650 kHz (FREQ = low) or
1.2 MHz (FREQ = high). Higher switching frequency improves load transient response but reduces slightly the
efficiency. The other benefits of higher switching frequency are a lower output ripple voltage. Usually, it is
recommended to use 1.2 MHz switching frequency unless light load efficiency is a major concern.
To avoid mis-operation of the device at low input voltages an undervoltage lockout is included that disables the
device, if the input voltage falls below 2.2 V.
A thermal shutdown is implemented to prevent damages due to excessive heat and power dissipation. Typically
the thermal shutdown threshold is 150°C. When the thermal shutdown is triggered the device stops switching
until the temperature falls below typically 136°C. Then the device starts switching again.
12
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TPS61085
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