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| 型号： | TPS51116RGER |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 6 A SWITCHING CONTROLLER, PQCC24 |
| 封装： | 4 X 4 MM, GREEN, PLASTIC, QFN-24 |
| 文件页数： | 11/40页 |
| 文件大小： | 931K |
| 代理商： | TPS51116RGER |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页当前第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页
wP1 +
1
C
R
O
(10)
wP2 +
1
C
O
RL
(11)
wP3 +
1
C
C2
R
C
(12)
wZ1 +
1
C
R
C
(13)
wZ2 +
1
C
O
ESR
(14)
f
0 +
1
2p
R1
R1 ) R2
gm
C
O
R
C
R
S
+
1
2p
0.75
V
OUT
gm
C
O
R
C
R
S
(15)
L +
1
I
IND(ripple)
f
V
IN(max) * VOUT
V
OUT
V
IN(max)
+
2
I
OUT(max)
f
V
IN(max) * VOUT
V
OUT
V
IN(max)
(16)
I
IND(peak) +
V
TRIP
R
DS(on)
)
1
L
f
V
IN(max) * VOUT
V
OUT
V
IN(max)
(17)
R
C v 2p
f
0
V
OUT
0.75
C
O
gm
R
S
(18)
R
C + 2.8
V
OUT
C
O [mF]
R
S [mW]
(19)
www.ti.com................................................................................................................................................................ SLUS609H – MAY 2004 – REVISED JULY 2009
Usually, each frequency of those poles and zeros is lower than the 0 dB frequency, f0. However, the f0 should be
kept under 1/3 of the switching frequency to avoid effect of switching circuit delay. The f0 is given by Equation 15.
Based on small signal analysis above, the external components can be selected by following manner.
1. Choose the inductor. The inductance value should be determined to give the ripple current of
approximately 1/4 to 1/2 of maximum output current.
The inductor also needs to have low DCR to achieve good efficiency, as well as enough room above peak
inductor current before saturation. The peak inductor current can be estimated as shown in Equation 17.
2. Choose rectifying (bottom) MOSFET. When RDS(on) sensing scheme is selected, the rectifying MOSFET’s
on-resistance is used as this RS so that lower RDS(on) does not always promise better performance. In order
to clearly detect inductor current, minimum RS recommended is to give 15 mV or larger ripple voltage with
the inductor ripple current. This promises smooth transition from CCM to DCM or vice versa. Upper side of
the RDS(on) is of course restricted by the efficiency requirement, and usually this resistance affects efficiency
more at high-load conditions. When using external resistor current sensing, there is no restriction for low
RDS(on). However, the current sensing resistance RS itself affects the efficiency
3. Choose output capacitor(s). In cases of organic semiconductor capacitors (OS-CON) or specialty polymer
capacitors (SP-CAP), ESR to achieve required ripple value at stable state or transient load conditions
determines the amount of capacitor(s) need, and capacitance is then enough to satisfy stable operation. The
peak-to-peak ripple value can be estimated by ESR times the inductor ripple current for stable state, or ESR
times the load current step for a fast transient load response. In case of ceramic capacitor(s), usually ESR is
small enough to meet ripple requirement. On the other hand, transient undershoot and overshoot driven by
output capacitance becomes the key factor to determine the capacitor(s).
4. Determine f0 and calculate RC using Equation 18. Note that higher RC shows faster transient response in
cost of unstableness. If the transient response is not enough even with high RC value, try increasing the out
5. Calculate CC2. Purpose of this capacitance is to cancel zero caused by ESR of the output capacitor. In case
Copyright 2004–2009, Texas Instruments Incorporated
19
Product Folder Link(s): TPS51116
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| TPS51116RGERG4 | 功能描述:DC/DC 开关控制器 DDR2 SWITCHER AND LDO RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS51116RGET | 功能描述:DC/DC 开关控制器 DDR2 SWITCHER AND LDO RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS51116RGET | 制造商:Texas Instruments 功能描述:DC/DC CONVERTER IC 制造商:Texas Instruments 功能描述:IC, SYNC BUCK CONTROLLER, VQFN-24 |
| TPS51116RGETG4 | 功能描述:DC/DC 开关控制器 DDR2 SWITCHER AND LDO RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS51117 | 制造商:TI 制造商全称:Texas Instruments 功能描述:SINGLE SYNCHRONOUS STEP-DOWN CONTROLLER |
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