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参数资料
| 型号： | TLV61225DCK |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, PDSO6 |
| 封装： | GREEN, PLASTIC, SC-70, 6 PIN |
| 文件页数： | 3/18页 |
| 文件大小： | 770K |
| 代理商： | TLV61225DCK |
IN
OUT
IN
OUT
V
(V
- V )
1
L =
f 200 mA
V
TLV61225
www.ti.com
SLVSAF0 – AUGUST 2010
APPLICATION INFORMATION
DESIGN PROCEDURE
The TLV61225 DC/DC converter is intended for systems powered by a single or dual cell Alkaline or NiMH
battery with a typical terminal voltage between 0.7 V and 3.3 V. Additionally, any other voltage source with a
typical output voltage between 0.7 V and 3.3 V can be used with the TLV61225.
Programming the Output Voltage
At fixed voltage versions, the output voltage is programmed by an internal resistor divider. The FB pin is used to
sense the output voltage. To configure the devices properly, the FB pin needs to be connected directly to VOUT.
Inductor Selection
To make sure that the TLV61225 devices can operate, a suitable inductor must be connected between pin VIN
and pin L. Inductor values of 4.7 mH show good performance over the whole input and output voltage range.
Due to the fixed inductor current ripple control the switching frequency is defined by the inductor value. For a
given switching frequency, input and output voltage the required inductance can be estimated using Equation 1.
(1)
Using inductor values higher than 4.7 mH can improve efficiency since higher values cause lower switching
frequency and less switching losses. Using inductor values below 2.2 mH is not recommended.
To ensure reliable operation of the TLV61225 under all load conditons it is recommended to use indutors with a
current rating of 400mA or higher. This will cover normal operation including current peaks during line and load
transients.
The following inductor series from different suppliers have been used with the TLV61225 converter:
Table 2. List of Inductors
VENDOR
INDUCTOR SERIES
EPL3015
Coilcraft
EPL2010
Murata
LQH3NP
Tajo Yuden
NR3015
Wurth Elektronik
WE-TPC Typ S
Capacitor Selection
Input Capacitor
At least a 10-mF input capacitor is recommended to improve transient behavior of the regulator and EMI behavior
of the total power supply circuit. A ceramic capacitor placed as close as possible to the VIN and GND pins of the
IC is recommended.
Output Capacitor
For the output capacitor C2 , it is recommended to use small ceramic capacitors placed as close as possible to
the VOUT and GND pins of the IC. There are no minimum output capacitor ESR requirements for maintaining
control loop stability. If, for any reason, the application requires the use of large capacitors which can not be
placed close to the IC, the use of a small ceramic capacitor with an capacitance value in the range of 2.2mF in
parallel to the large capacitor is recommended. This small capacitor should be placed as close as possible to the
VOUT and GND pins of the IC.
A minimum capacitance value of 4.7 mF should be used, 10 mF are recommended. To calculate the required
output capacitance in case an inductor with a value higher than 4.7 mH has been selected Equation 2 can be
used.
Copyright 2010, Texas Instruments Incorporated
11
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