参数资料
型号: TPS62125EVM-044
厂商: Texas Instruments
文件页数: 26/38页
文件大小: 0K
描述: EVAL MODULE FOR TPS62125-044
标准包装: 1
系列: DCS-Control™
主要目的: DC/DC,步降
输出及类型: 1,非隔离
输出电压: 3.3V
电流 - 输出: 300mA
输入电压: 4 ~ 17 V
稳压器拓扑结构: 降压
板类型: 完全填充
已供物品:
已用 IC / 零件: TPS62125
SLVSAQ5C – MARCH 2012 – REVISED DECEMBER 2013
OUTPUT FILTER DESIGN (INDUCTOR AND OUTPUT CAPACITOR)
The external components have to fulfill the needs of the application, but also the stability criteria of the devices
control loop. The TPS62125 is optimized to work within a range of L and C combinations. The LC output filter
inductance and capacitance have to be considered together, creating a double pole, responsible for the corner
frequency of the converter. Table 3 can be used to simplify the output filter component selection.
Table 3. Recommended LC Output Filter Combinations
Inductor Value
[μH] (1)
10μF
Output Capacitor Value [μF] (2)
2 x 10μF 22μF
47μF
V OUT 1.2V - 1.8V
15
22
√ (3)
VOUT 1.8V - 3.3V
15
22
√ (3)
√ (3)
VOUT 3.3V - 5V
10
15
√ (3)
√ (3)
22
VOUT 5V - 10V
10
15
22
√ (3)
√ (3)
(1)
(2)
(3)
Inductor tolerance and current de-rating is anticipated. The effective inductance can vary by 20% and -30%.
Capacitance tolerance and bias voltage de-rating is anticipated. The effective capacitance can vary by 20% and -50%.
This LC combination is the standard value and recommended for most applications.
More detailed information on further LC combinations can be found in application note SLVA515.
INDUCTOR SELECTION
The inductor value affects its peak-to-peak ripple current, the PWM-to-PFM transition point, the output voltage
ripple and the efficiency. The selected inductor has to be rated for its DC resistance and saturation current. The
inductor ripple current ( Δ I L ) decreases with higher inductance and increases with higher V IN or V OUT and can be
estimated according to Equation 13 .
Equation 14 calculates the maximum inductor current under static load conditions. The saturation current of the
inductor should be rated higher than the maximum inductor current as calculated with Equation 14 . This is
recommended because during heavy load transient the inductor current will rise above the calculated value. A
more conservative way is to select the inductor saturation current according to the high-side MOSFET switch
current limit I LIMF .
D I L =
( V IN - V OUT )
L
′ T ON
(13)
I Lmax = I outmax +
I L
2
(14)
With:
T ON = see equation (3)
L = Inductance
Δ I L = Peak to Peak inductor ripple current
I Lmax = Maximum Inductor current
26
Product Folder Links : TPS62125
Copyright ? 2012–2013, Texas Instruments Incorporated
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