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| 型号： | TPS62410DRCRG4 |
| 厂商： | Texas Instruments |
| 文件页数： | 24/33页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.8A 10SON |
| 标准包装： | 3,000 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.6 V ~ 6 V |
| 输入电压： | 2.5 V ~ 6 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 2.25MHz |
| 电流 - 输出： | 800mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-VFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-SON 裸露焊盘（3x3） |
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www.ti.com
SLVS737 – FEBRUARY 2007
APPLICATION INFORMATION (continued)
TPS62410
VIN 3.3 V – 6 V
C IN
10 m F
VIN
FB 1
SW1
L1
2.2 m H
R11
270 k W
V OUT1 = 1.5 V
up to 800 mA
C OUT1 = 10 m F
EN_1
DEF_1
R12
180 k W
Cff2
EN_2
MODE/
DATA
SW2
L2
3.3 m H
R21
825 k W 33 pF
V OUT2 = 2.85 V
up to 800 mA
C OUT2 = 10 m F
ADJ2
GND
R22
220 k W
Figure 34. Typical Application Circuit 1.5V/2.85V Adjustable Outputs
OUTPUT FILTER DESIGN (INDUCTOR AND OUTPUT CAPACITOR)
The device is optimized to operate with inductors of 2.2 μ H to 4.7 μ H and output capacitors of 10 μ F to 22 μ F.
For operation with a 2.2 μ H inductor, a 22 μ F capacitor is suggested.
Inductor Selection
The selected inductor has to be rated for its DC resistance and saturation current. The DC resistance of the
inductance will influence directly the efficiency of the converter. Therefore an inductor with lowest DC resistance
should be selected for highest efficiency.
Equation 6 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 7 . This is
recommended because during heavy load transient the inductor current will rise above the calculated value.
1 * Vout
DI L + Vout
Vin
L ?
(6)
I Lmax + I outmax )
D I L
2
(7)
With:
f = Switching Frequency (2.25MHz typical)
L = Inductor Value
? I L = Peak to Peak inductor ripple current
I Lmax = Maximum Inductor current
The highest inductor current will occur at maximum Vin.
Open core inductors have a soft saturation characteristic and they can usually handle higher inductor currents
versus a comparable shielded inductor.
A more conservative approach is to select the inductor current rating just for the maximum switch current of the
corresponding converter. It must be considered, that the core material from inductor to inductor differs and will
have an impact on the efficiency especially at high switching frequencies.
24
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