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參數資料
| 型號： | TPS40021EVM-001 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | High-Efficiency Synchronous Buck Converter with PWM Controller Evaluation Module(帶PWM控制器的高效率同步降壓轉換器TPS40021的評估模塊) |
| 中文描述： | 高效率同步降壓轉換器與PWM控制器評估模塊（帶脈寬調制控制器的高效率同步降壓轉換器TPS40021的評估模塊） |
| 文件頁數： | 3/13頁 |
| 文件大?。?/td> | 405K |
| 代理商： | TPS40021EVM-001 |
SLUU144A April 2003 Revised November 2003
3
TPS40021EVM001 High-Efficiency Synchronous Buck Converter with PWM Controller Evaluation Module (HPA009)
2
Design Procedure
2.1
Frequency Setting
Choosing the switching frequency demands a trade-off. The higher the frequency, the smaller
the inductance and capacitance needed, so the smaller the size, but then the switching losses
are higher, and efficiency is poorer. For this evaluation module, 300 kHz is chosen for
reasonable efficiency and size.
A resistor R4, which is connected from pin 7 to ground, programs the oscillator frequency. The
approximate operating frequency is calculated in equation (1).
R4 (k )
35.4
f
OSC
(MHz)
118 k
Therefore, a 118-k
resistor is chosen for 300 kHz operation.
2.2
Inductance Value
The inductance value can be calculated by equation (2).
L
(min)
V
OUT
I
RIPPLE
f
1
V
OUT
V
IN(max)
where I
RIPPLE
is the ripple current flowing through the inductor, which affects the output voltage
ripple and core losses.
Based on 20% ripple current and 300 kHz, the inductance value is calculated to 0.76
μ
H and a
0.75-
μ
H inductor (part number is CDEP1490R7) is chosen. The ESR of this inductor is 1.1 m
and the loss is 440 mW, which is approximately 1.5% of output power.
2.3
Input and Output Capacitors
The output capacitance and its ESR needed are calculated in equations (3) and (4).
C
OUT(min)
I
RIPPLE
f
8
V
RIPPLE
ESR
OUT
V
RIPPLE
I
RIPPLE
With 1% output voltage ripple, the needed capacitance is at least 114
μ
F and its ESR should be
less than 3.7 m
. Three 2.5-V, 470-
μ
F, POSCAP capacitors from Sanyo are used. The ESR is
10 m
each.
The required input capacitance is calculated in equation (5). The calculated value is
approximately 348
μ
F. Three 6.3-V, 330-
μ
F POSCAP capacitors with 10 m
ESR are used to
handle 10 A of RMS input current. Additionally, two ceramic capacitors are used to reduce the
switching ripple current.
C
IN(min)
I
OUT(max)
D
(max)
T
S
V
RIPPLE
(1)
(2)
(3)
(4)
(5)
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|---|---|
| TPS40021MPWPEP | 功能描述:DC/DC 開關控制器 Enhanced Prod Synch Buck Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| TPS40021MPWPREP | 功能描述:DC/DC 開關控制器 Enhanced Prod Synch Buck Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| TPS40021PWP | 功能描述:DC/DC 開關控制器 Low Input Sync Buck Cntrlr source/sink RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| TPS40021PWPG4 | 功能描述:DC/DC 開關控制器 Low Input Sync Buck Cntrlr source/sink RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| TPS40021PWPR | 功能描述:DC/DC 開關控制器 Low Input Sync Buck Cntrlr source/sink RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
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