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參數資料
| 型號： | TPS62046DRC |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Programmable Logic Controller; Leaded Process Compatible:No; Peak Reflow Compatible (260 C):No RoHS Compliant: No |
| 中文描述： | 可編程邏輯控制器；無鉛，不支持260℃峰值回流焊溫度；符合RoHS認證 |
| 文件頁數： | 13/21頁 |
| 文件大小： | 372K |
| 代理商： | TPS62046DRC |
SLVS463A JUNE 2003 REVISED OCTOBER 2003
www.ti.com
13
APPLICATION INFORMATION
ADJUSTABLE OUTPUT VOLTAGE VERSION
When the adjustable output voltage version TPS62040 is used, the output voltage is set by the external resistor
divider. See Figure 15.
The output voltage is calculated as:
VO
0.5 V
1
R1
R2
with R1 + R2
≤
1 M
and internal reference voltage V
ref
typical = 0.5 V
R1 + R2 should not be greater than 1 M
because of stability reasons. To keep the operating quiescent current to
a minimum, the feedback resistor divider should have high impedance with R1+R2
≤
1 M
. Due to this and the low
reference voltage of V
ref
= 0.5 V, the noise on the feedback pin (FB) needs to be minimized. Using a capacitive divider
C1 and C2 across the feedback resistors minimizes the noise at the feedback, without degrading the line or load
transient performance.
C1 and C2 should be selected as:
C1
1
2
10 kHz
R1
with:
R1 = upper resistor of voltage divider
C1 = upper capacitor of voltage divider
For C1 a value should be chosen that comes closest to the calculated result.
C2
R1
R2
C1
with:
R2 = lower resistor of voltage divider
C2 = lower capacitor of voltage divider
For C2, the selected capacitor value should always be selected larger than the calculated result. For example, in
Figure 15 for C2 100 pF are selected for a calculated result of C2 = 88.42 pF.
If quiescent current is not a key design parameter C1 and C2 can be omitted, and a low impedance feedback divider
has to be used with R1 + R2
<
100 k
. This reduces the noise available on the feedback pin (FB) as well but increases
the overall quiescent current during operation. The higher the programmed output voltage the lower the feedback
impedance has to be for best operation when not using C1 and C2.
VIN
VIN
EN
MODE
GND
SW
SW
FB
PGND
PGND
2
3
1
6
4
9
10
5
7
8
TPS62040
C3
10
μ
F
VI
2.5 V to 6 V
L1
10
μ
H
C4
10
μ
F
VO
1.8 V / 1.2 A
R1
470 k
R2
180 k
C1
33 pF
C2
100 pF
Figure 15. Adjustable Output Voltage Version
(3)
(4)
(5)
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| TPS62044DRC | 1.2 A/1.25 MHZ, HIGH EFFICIENCY STEP DOWN CONVERTER |
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| TPS62050DGSG4 | 功能描述:直流/直流開關調節器 Adj 800mA 10V Vin Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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