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| 型号： | TPS51916EVM-746 |
| 厂商： | Texas Instruments |
| 文件页数： | 22/34页 |
| 文件大小： | 0K |
| 描述： | EVAL MODULE FOR TPS51916-746 |
| 标准包装： | 1 |
| 系列： | D-Cap™, D-Cap2™ |
| 主要目的： | 特殊用途 DC/DC，DDR 存储器电源 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.2 V ~ 1.5 V |
| 电流 - 输出： | 20A |
| 输入电压： | 8 ~ 20 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 500kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | TPS51916 |
| 其它名称： | 296-30054 TPS51916EVM-746-ND |
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TPS51916
SLUSAE1D – DECEMBER 2010 – REVISED JUNE 2012
External Components Selection
The external components selection is simple in D-CAP? mode.
1. DETERMINE THE VALUE OF R1 AND R2
The output voltage is determined by the value of the voltage-divider resistor, R1 and R2 as shown in Figure 35 .
R1 is connected between VREF and REFIN pins, and R2 is connected between the REFIN pin and GND. Setting
R2 =
R1
? ?
? ÷
1.8
? I IND ( ripple ) ′ ESR ? ÷
? V OUT - ? ÷ ÷
? ÷
? ÷ - 1
?
? ? 2 ÷ ÷
è è ? ?
(7)
2. CHOOSE THE INDUCTOR
The inductance value should be determined to yield a ripple current of approximately ? to ? of maximum output
current. Larger ripple current increases output ripple voltage and improves the signal-to-noise ratio and helps
stable operation.
) ′ V
) ′ V
L X =
1
I IND ( ripple ) ′ f SW
′
( V IN ( max ) - V OUT
V IN ( max )
OUT
=
3
I O ( max ) ′ f SW
′
( V IN ( max ) - V OUT
V IN ( max )
OUT
(8)
The inductor needs a low direct current resistance (DCR) to achieve good efficiency, as well as enough room
above peak inductor current before saturation. The peak inductor current can be estimated in Equation 9 .
V IN ( max ) - V OUT OUT
)
(
′ V
L ′ f SW IN ( max )
I IND ( peak ) =
R TRIP ′ I TRIP
8 ′ R DS ( on )
1
+ ′
V
(9)
3. CHOOSE THE OCL SETTING RESISTANCE, R TRIP
? ( V IN - V OUT ) ? V OUT
( 2 ′ L X ) ? ÷ ( f SW IN ) ? ÷
′ V
R TRIP
=
? ?
8 ′ ? I OCL - ? ÷ ′ ÷ ′ R DS(on)
? ?
è è
I TRIP
(10)
4. CHOOSE THE OUTPUT CAPACITORS
D-CAP? Mode
Organic semiconductor capacitor(s) or specialty polymer capacitor(s) are recommended. Determine ESR to meet
small signal stability and recommended ripple voltage. A quick reference is shown in Equation 11 and
￡ SW
1
2 p ′ ESR ′ C OUT
f
3
(11)
V OUT ′ ESR
f SW ′ L X
3 20mV
(12)
D-CAP2? Mode
22
Copyright ? 2010–2012, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS51916EVM-746 | 制造商:Texas Instruments 功能描述:TPS51916, DC/DC CONVERTER, STEP DOWN, EV |
| TPS51916RUK | 制造商:TI 制造商全称:Texas Instruments 功能描述:Using the TPS51916EVM-746 Complete DDR2, DDR3 |
| TPS51916RUKR | 功能描述:直流/直流开关调节器 DDR2,DDR3 & DDR3L BUCK CONTROLLER RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS51916RUKT | 功能描述:直流/直流开关调节器 DDR2,DDR3 & DDR3L BUCK CONTROLLER RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS51980RTVR | 制造商:Texas Instruments 功能描述:DUAL PWM,99% MAX |
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