参数资料
| 型号： | TPS54326RGTT |
| 厂商： | Texas Instruments |
| 文件页数： | 13/29页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A 16QFN |
| 标准包装： | 250 |
| 系列： | SWIFT™, D-CAP2™ |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.76 V ~ 5.5 V |
| 输入电压： | 2 V ~ 18 V |
| PWM 型： | 混合物 |
| 频率 - 开关： | 700kHz |
| 电流 - 输出： | 3A |
| 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： | 16-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-QFN-EP（3x3） |
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页第11页第12页当前第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
SLVSA13E – OCTOBER 2009 – REVISED JUNE 2012
Output Filter Selection
The output filter used with the TPS54326 is an LC circuit. This LC filter has double pole at:
2 p L OUT OUT
F P =
1
′ C
(5)
At low frequencies, the overall loop gain is set by the output set-point resistor divider network and the internal
gain of the TPS54326. The low frequency phase is 180 degrees. At the output filter pole frequency, the gain rolls
off at a –40 dB per decade rate and the phase drops rapidly. D-CAP2? introduces a high frequency zero that
reduces the gain roll off to -20 dB per decade and increases the phase to 90 degrees one decade above the
zero frequency. The inductor and capacitor selected for the output filter must be selected so that the double pole
of Equation 5 is located below the high frequency zero but close enough that the phase boost provided by the
high frequency zero provides adequate phase margin for a stable circuit. To meet this requirement use the
Table 1. Recommended Component Values
OUTPUT VOLTAGE
(V)
1
1.05
1.2
1.8
2.5
3.3
5
R1 (k Ω )
6.81
8.25
12.7
30.1
49.9
73.2
121
R2 (k Ω )
22.1
22.1
22.1
22.1
22.1
22.1
22.1
C4 (pF) (1)
10 - 47
10 - 47
10 - 47
10 - 47
L1 (μH)
1.5
1.5
1.5
2.2
2.2
2.2
3.3
C4 + C5 (μF)
22 - 68
22 - 68
22 - 68
22 - 68
22 - 68
22 - 68
22 - 68
(1)
Optional
For higher output voltages at or above 1.8 V, additional phase boost can be achieved by adding a feed forward
capacitor (C4) in parallel with R1.
The inductor peak-to-peak ripple current, peak current, and RMS current are calculated using Equation 6 ,
Equation 7 , and Equation 8 . The inductor saturation current rating must be greater than the calculated peak
current and the RMS or heating current rating must be greater than the calculated RMS current. Use 700 kHz for
f SW .
? 2
√
I O + ? Ilp - p
1
I Lo(RMS) =
V L ? f IN (max) O SW
V OUT V IN (max) -V OUT
Ilp - p = ? ? ?
Ilp - p
I lpeak =I O + ?
2
2
12
(6)
(7)
(8)
For this design example, the calculated peak current is 3.47 A and the calculated RMS current is 3.01 A. The
inductor used is a TDK SPM6530-1R5M100 with a peak current rating of 11.5 A and an RMS current rating of 11
A.
The capacitor value and ESR determines the amount of output voltage ripple. The TPS54326 is intended for use
with ceramic or other low ESR capacitors. Recommended values range from 22 μF to 68 μF. Use Equation 9 to
determine the required RMS current rating for the output capacitor.
I CO(RMS) = ?
V OUT ? ( V IN - V OUT )
√ 12 ? V IN ? L O ? f SW
?
(9)
For this design two TDK C3216X5R0J226M 22 μF output capacitors are used. The typical ESR is 2 m Ω each.
The calculated RMS current is 0.271 A and each output capacitor is rated for 4 A.
Copyright ? 2009–2012, Texas Instruments Incorporated
13
相关PDF资料 |
PDF描述 |
|---|---|
| TPS54478RTER | IC REG BUCK SYNC ADJ 4A 16WQFN |
| TPS54550PWPG4 | IC REG BUCK SYNC ADJ 6A 16HTSSOP |
| TPS54678RTER | IC REG BUCK SYNC ADJ 6A 16WQFN |
| TPS54900PWRG4 | IC REG BUCK ADJ .1A QUAD 16TSSOP |
| TPS60110PWPG4 | IC REG BST SWITCHED CAP 20HTSSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS54327 | 制造商:TI 制造商全称:Texas Instruments 功能描述:3-A OUTPUT SINGLE SYNCHRONOUS STEP DOWN SWITCHER WITH INTEGRATED FET (SWIFTTM ) |
| TPS54327DDA | 功能描述:直流/直流开关转换器 4.5-18Vin,3A Sync Step-Down Cnvrtr 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 |
| TPS54327DDAR | 功能描述:直流/直流开关转换器 4.5-18Vin,3A Sync Step-Down Cnvrtr 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 |
| TPS54327DRCR | 制造商:Texas Instruments 功能描述:IC REG BUCK SYNC ADJ 3A 10SON 制造商:Texas Instruments 功能描述:3A Single Sync DC/DC converter |
| TPS54327DRCT | 制造商:Texas Instruments 功能描述:3A SINGLE SYNC DC/DC CONVERTER - Tape and Reel 制造商:Texas Instruments 功能描述:3A SINGLE SYNC DC/DC CONVERTER - Cut TR (SOS) 制造商:Texas Instruments 功能描述:IC REG BUCK SYNC ADJ 3A 10SON 制造商:Texas Instruments 功能描述:IC SYNC STEP DOWN 700KHZ SO 制造商:Texas Instruments 功能描述:IC, SYNC STEP DOWN, 700KHZ, SON-10 制造商:Texas Instruments 功能描述:Voltage Regulators - Switching Regulators 4.5-18Vin,3A Sync SD DCAP Mode Cnvrtr 制造商:Texas Instruments 功能描述:IC, SYNC STEP DOWN, 700KHZ, SON-10, Primary Input Voltage:18V, No. of Outputs:1, Output Voltage:7V, Output Current:3A, Voltage Regulator Case Style:SON, No. of Pins:10, Operating Temperature Min:-40C, Operating Temperature Max:85C, 制造商:Texas Instruments 功能描述:3A Single Sync DC/DC converter 制造商:Texas Instruments 功能描述:DC-DC CONV, BUCK, ADJ, 700KHZ, SON-10, Primary Input Voltage:18V, No. of Outputs:1, Output Voltage:7V, Output Current:3A, No. of Pins:10, Operating Temperature Min:-40C, Operating Temperature Max:85C, MSL:MSL 2 - 1 year , RoHS Compliant: Yes |
发布紧急采购，3分钟左右您将得到回复。