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參數(shù)資料
| 型號： | TPS62321DRC |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 500-mA, 3-MHz SYNCHRONOUS STEP-DOWN CONVERTER IN CHIP SCALE PACKAGING |
| 中文描述： | 500毫安，3 MHz的同步降壓轉(zhuǎn)換器芯片級封裝 |
| 文件頁數(shù)： | 17/31頁 |
| 文件大小： | 1635K |
| 代理商： | TPS62321DRC |
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APPLICATION INFORMATION
ADJUSTABLE OUTPUT VOLTAGE
When the adjustable output voltage versions, TPS62300 or TPS62320, are used, the output voltage is set by the
external resistor divider (see
Figure 32
).
VO
1.5
Vref
1
R1
R2
with an internal reference voltage Vreftypical
0.4 V
(2)
AVIN
VIN
SW
TPS62300
L1
ADJ
C1
PGND
C2
V
I
AGND
VOUT
R1
R2
EN
MODE/SYNC
A
A
FB
A
1
2
3
8
7
10
6
4
5
9
V
O
1.6V/500mA
2.7V..6V
4.7 F
m
4.7 F
m
OUTPUT FILTER DESIGN (INDUCTOR AND OUTPUT CAPACITOR)
The TPS6230x, TPS6231x, and TPS6232x series of step-down converters have internal loop compensation.
Therefore, the external L-C filter must be selected to work with the internal compensation.
The device has been designed to operate with inductance values between a minimum of 0.7
μ
H and maximum of
6.2
μ
H. The internal compensation is optimized to operate with an output filter of L = 1
μ
H and C
O
= 10
μ
F. Such
an output filter has its corner frequency at:
c
1
2
L
CO
1
2
1 H
10 F
50.3 kHz
(3)
TPS62300, TPS62301, TPS62302
TPS62303, TPS62305, TPS62311
TPS62313, TPS62320, TPS62321
SLVS528B–JULY 2004–REVISED JUNE 2005
The output voltage is calculated as:
To keep the operating quiescent current to a minimum, it is recommended that R2 be set in the range of 75 k
to
130 k
. Route the FB line away from noise sources, such as the inductor or the SW line.
Figure 32. Adjustable Output Voltage Version
Operation with a higher corner frequency (e.g., L = 1
μ
H, C
O
= 4.7
μ
F) is possible. However, it is recommended
the loop stability be checked in detail. Selecting a larger output capacitor value (e.g., 22
μ
F) is less critical
because the corner frequency moves to lower frequencies with fewer stability problems. The possible output filter
combinations are listed in
Table 1
.
Regardless of the inductance value, operation is recommended with 10-
μ
F output capacitor in applications with
high-load transients (e.g.,
≥
1600 mA/
μ
s).
Table 1. Output Filter Combinations
INDUCTANCE (L)
1
μ
H
2.2
μ
H
OUTPUT CAPACITANCE (C
O
)
≥
4.7
μ
F (ceramic capacitor)
≥
2.2
μ
F (ceramic capacitor)
The inductor value also has an impact on the pulse skipping operation. The transition into power-save mode
begins when the valley inductor current goes below a level set internally. Lower inductor values result in higher
ripple current which occurs at lower load currents. This results in a dip in efficiency at light load operations.
17
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| TPS62321DRCR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.5V 500-mA 3-MHz Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62321DRCRG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.5V 500-mA 3-MHz Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62321YEDR | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 1.5V 500-mA 3-MHz Step-Down Converter RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| TPS62321YEDT | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 1.5V 500-mA 3-MHz Step-Down Converter RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| TPS62321YZDR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.5V 500-mA 3-MHz Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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