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| 型号： | TPS51916EVM-746 |
| 厂商： | Texas Instruments |
| 文件页数： | 19/34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
D-CAP2? Mode Operation
V IN
VDDQSNS
9
C C2
C C1
R C2
R C1
13
SW
DRVH
G
Control
14
L X
VDDQ
Logic
REFIN
8
Σ
PWM
+
and
Driver
11
DRVL
C OUT
R LOAD
R1
VREF
6
R2
+
1.8 V
f 0 = ￡ SW
TPS51916
UDG-10198
Figure 37. Simplified Modulator Using D-CAP2? Mode
The D-CAP2? mode in the TPS51916 includes an internal feedback network enabling the use of very low ESR
output capacitor(s) such as multi-layer ceramic capacitors. The role of the internal network is to sense the ripple
component of the inductor current information and combine it with voltage feedback signal. Using R C1 =R C2 ≡ R C
and C C1 =C C2 ≡ C C , 0-dB frequency of the D-CAP2? mode is given by Equation 3 . It is recommended that the 0-
dB frequency (f 0 ) be lower than 1/3 of the switching frequency to secure the proper phase margin
R C ′ C C f
2 p ′ G ′ L X ′ C OUT 3
where
?
G is gain of the amplifier which amplifies the ripple current information generated by the compensation
circuit
(3)
The typical G value is 0.25, and typical R C C C time constant values for 500 kHz and 670 kHz operation are 23 μs
and 14.6 μs, respectively.
For example, when f SW =500 kHz and L X =1 μH, C OUT should be larger than 88 μF.
When selecting the capacitor, pay attention to its characteristics. For MLCC use X5R or better dielectric and
consider the derating of the capacitance by both DC bias and AC bias. When derating by DC bias and AC bias
are 80% and 50%, respectively, the effective derating is 40% because 0.8 x 0.5 = 0.4. The capacitance of
specialty polymer capacitors may change depending on the operating frequency. Consult capacitor
manufacturers for specific characteristics.
Light-Load Operation
In auto-skip mode, the TPS51916 SMPS control logic automatically reduces its switching frequency to improve
light-load efficiency. To achieve this intelligence, a zero cross detection comparator is used to prevent negative
inductor current by turning off the low-side MOSFET. Equation 4 shows the boundary load condition of this skip
mode and continuous conduction operation.
( V IN OUT ) ′ ′
V OUT
I LOAD(LL) =
- V
2 ′ L X V IN
1
f SW
(4)
Copyright ? 2010–2012, Texas Instruments Incorporated
19
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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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