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参数资料
| 型号： | TS3410CX5RF |
| 元件分类： | 稳压器 |
| 英文描述： | 1.4 A SWITCHING REGULATOR, 1700 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封装： | ROHS COMPLIANT, SOT-25, 5 PIN |
| 文件页数： | 5/10页 |
| 文件大小： | 457K |
| 代理商： | TS3410CX5RF |
TS3410
1A / 1.4MHz Synchronous Buck Converter
4/10
Version: C08
Application Information
Setting the Output Voltage
Application circuit item shows the basic application circuit with TS3410 adjustable output version. The external
resistor sets the output voltage according to the following formula:
Inductor Selection
For most designs, the TS3410 operates with inductors of 2.2H to 3.3H. Low inductance values are physically
smaller but require faster switching, which results in some efficiency loss. The inductor value can be derived from
the following formula:
Where is inductor Ripple Current. Large value inductors lower ripple current and small value inductors result in high
ripple currents. Choose inductor ripple current approximately 20% of the maximum load current 1A, IL=200mA.
For output voltages above 2.0V, when light-load efficiency is important, the minimum recommended inductor is
2.7H. For optimum voltage-positioning load transients, choose an inductor with DC series resistance in the 50m
to 150m
range. For higher efficiency at heavy loads (above 200mA), or minimal load regulation (but some
transient overshoot), the resistance should be kept below 100m . The DC current rating of the inductor should be
at least equal to the maximum load current plus half the ripple current to prevent core saturation (1000mA+100mA)
Input Capacitor Selection
The input capacitor reduces the surge current drawn from the input and switching noise from the device. The input
capacitor impedance at the switching frequency shall be less than input source impedance to prevent high
frequency switching current passing to the input. A low ESR input capacitor sized for maximum RMS current must
be used. Ceramic capacitors with X5R or X7R dielectrics are highly recommended because of their low ESR and
small temperature coefficients. A 4.7F ceramic capacitor for most applications is sufficient.
Output Capacitor Selection
The output capacitor is required to keep the output voltage ripple small and to ensure regulation loop stability. The
output capacitor must have low impedance at the switching frequency. Ceramic capacitors with X5R or X7R
dielectrics are recommended due to their low ESR and high ripple current.
Compensation Capacitor Selection
The compensation capacitors for increasing phase margin provide additional stability. It is required and more than
15pF. Please refer to demo board schematic for design.
Table 1: Resistor Select for Output Voltage Setting
VOUT
R2
R1
1.2V
300K
1.5V
300K
450K
1.8V
300K
600K
2.5V
150K
470K
3.3V
120K
540K
5V
124K
910K
Table 2: Inductor Select for Output Voltage Setting (VIN=3.6V)
VOUT
1.2V
1.5V
1.8V
2.5V
Inductor
2.7uH
2.2uH
Part Number
WE-TPC
7440430027
7440430022
Note: Part Type MH or M (www.we-online.com)
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