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参数资料
| 型号： | TPS62063DSGT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.6 A SWITCHING REGULATOR, 3400 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | 2 X 2 MM, 0.75 MM HEIGHT, GREEN, PLASTIC, WSON-8 |
| 文件页数： | 8/26页 |
| 文件大小： | 1109K |
| 代理商： | TPS62063DSGT |
I
Lmax + Ioutmax )
DIL
2
I
RMSCout + Vout
1 *
Vout
Vin
L
1
2
3
SLVSA95A
– MARCH 2010 – REVISED JANUARY 2011
(2)
With:
f = Switching Frequency (3MHz typical)
L = Inductor Value
ΔIL = Peak-to-Peak inductor ripple current
ILmax = Maximum inductor current
Ioutmax = Maximum output current
A more conservative approach is to select the inductor current rating just for the switch current of the converter.
Accepting larger values of ripple current allows the use of lower inductance values, but results in higher output
voltage ripple, greater core losses, and lower output current capability.
The total losses of the coil have a strong impact on the efficiency of the DC/DC conversion and consist of both
the losses in the dc resistance R(DC) and the following frequency-dependent components:
The losses in the core material (magnetic hysteresis loss, especially at high switching frequencies)
Additional losses in the conductor from the skin effect (current displacement at high frequencies)
Magnetic field losses of the neighboring windings (proximity effect)
Radiation losses
Table 2. List of Inductors
DIMENSIONS [mm3]
INDUCTANCE mH
INDUCTOR TYPE
SUPPLIER
3.2 x 2.5 x 1.2 max
1.0
MIPSAZ3225D
FDK
3.2 x 2.5 x 1.0 max
1.0
LQM32PN (MLCC)
Murata
3.7 x 4 x 1.8 max
1.0
LQH44 (wire wound)
Murata
4.0 x 4.0 x 2.6 max
1.2
NRG4026T (wire wound)
Taiyo Yuden
3.5 x 3.7 x 1.8 max
1.2
DE3518 (wire wound)
TOKO
Output Capacitor Selection
The advanced fast-response voltage mode control scheme of the TPS62060 allows the use of tiny ceramic
capacitors. Ceramic capacitors with low ESR values have the lowest output voltage ripple and are
recommended. The output capacitor requires either an X7R or X5R dielectric. Y5V and Z5U dielectric capacitors,
aside from their wide variation in capacitance over temperature, become resistive at high frequencies and may
not be used. For most applications a nominal 10
F or 22F capacitor is suitable. At small ceramic capacitors, the
DC-bias effect decreases the effective capacitance. Therefore a 22
F capacitor can be used for output voltages
higher than 2V, see list of capacitors.
In case additional ceramic capacitors in the supplied system are connected to the output of the DC/DC converter,
the output capacitor COUT need to be decreased in order not to exceed the recommended effective capacitance
range. In this case a loop stability analysis must be performed as described later.
At nominal load current, the device operates in PWM mode and the RMS ripple current is calculated as:
(3)
Input Capacitor Selection
Because of the nature of the buck converter having a pulsating input current, a low ESR input capacitor is
required for best input voltage filtering and minimizing the interference with other circuits caused by high input
voltage spikes. For most applications a 10
F ceramic capacitor is recommended. The input capacitor can be
increased without any limit for better input voltage filtering.
16
2010–2011, Texas Instruments Incorporated
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| TPS62065DSGR | 功能描述:直流/直流开关转换器 3MHz 2A Step-Down Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| TPS62065DSGT | 功能描述:直流/直流开关转换器 3MHz 2A Step-Down Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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