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參數(shù)資料
| 型號(hào)： | TPS56221DQPR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO22 |
| 封裝： | ROHS COMPLIANT, PLASTIC, SON-22 |
| 文件頁數(shù)： | 6/25頁 |
| 文件大?。?/td> | 655K |
| 代理商： | TPS56221DQPR |
-
=
=
IN(max)
OUT
IN(max)
SW
V
1
14 V
1.2 V
1
L
293 nH
0.3
I
V
f
0.3
25 A
14 V
500 kHz
(
)
(
)
(
)
(
)
(
) ( )
(
)
(
) ( )
( )
(
)
=
+
=
+
=
+
=
2
1
RIPPLE
OUT
RIPPLE
L rms
L avg
12
I
25
7.3
25.09 A
(
)
<
D =
=
2
TRAN
OVER
OUT
I
L
I
L
V
T
C
V
C
(
)
(
)
<
D
=
=
-
2
TRAN
UNDER
OUT
IN
OUT
IN
OUT
I
L
I
L
V
T
C
V
C
(
)
(
)
(
)
( )
=
m
2
TRAN(max)
OUT min
OUT
OVER
I
L
10
300 nH
C
500 F
1.2
50 mV
V
-
÷
÷
-
m
è
è
=
W
RIPPLE
RIPPLE(tot)
RIPPLE(cap)
OUT
SW
MAX
RIPPLE
I
7.8 A
V
24 mV
V
8
C
f
8
500 F
500 kHz
ESR
2.5 m
I
7.8 A
SLUSAH5
– MARCH 2011
Design Procedure
Switching Frequency Selection
To achieve a balance between small size and high efficiency for this design, use switching frequency of 500 kHz.
Inductor Selection (L1)
Synchronous buck power inductors are typically sized for between approximately 20% and 40% peak-to-peak
ripple current (IRIPPLE).
Using this target ripple current, the required inductor size can be calculated as shown in Equation 3.
(3)
Selecting a standard 300-nH inductor value, IRIPPLE =7.3A.
The RMS current through the inductor is approximated in Equation 4.
(4)
Output Capacitor Selection (C18, C20, C23)
The selection of the output capacitor is typically driven by the output transient response. Equation 5 and
Equation 6 overestimate the voltage deviation to account for delays in the loop bandwidth and can be used to
determine the required output capacitance.
If VIN(min) > 2 × VOUT, use overshoot (Equation 5) to calculate minimum output capacitance. If VIN(min) < 2 × VOUT,
use undershoot (Equation 6) to calculate minimum output capacitance.
(5)
(6)
(7)
With a minimum capacitance, the maximum allowable ESR is determined by the maximum ripple voltage and is
approximated inEquation 8.
(8)
In order to meet the low ESR and high capacitance requirements of this design, 5 100-
F, 1210 ceramic
capacitors are selected. 3 22-
F, 1206 ceramic capacitors and 2 10-F 0805 ceramic capacitors are added to
reduce ESL and inductive ringing. The combination of multiple capacitor types and ceramic capacitors of different
sizes provides a wider band to the filtering frequencies of the output capacitors.
14
Copyright
2011, Texas Instruments Incorporated
Product Folder Link(s) :TPS56221
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| TPS5625EVM-105 | 功能描述:HIGH-PERFORMANCE SYNCHRONOUS BUC RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):升壓 頻率 - 開關(guān):3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| TPS5625EVM-112 | 功能描述:HIGH-PERFORMANCE SYNCHRONOUS BUC RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):升壓 頻率 - 開關(guān):3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
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