參數(shù)資料
型號(hào)： TPS62421DRC
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 1.61 A DUAL SWITCHING CONTROLLER, 2500 kHz SWITCHING FREQ-MAX, PDSO10
封裝： 3 X 3 MM, PLASTIC, SON-10
文件頁(yè)數(shù)： 18/37頁(yè)
文件大?。?/td> 1020K
代理商： TPS62421DRC
V
OUT + VREF
1 )
R
11
R
12
with an internal reference voltage V
REF typical 0.6V
V
OUT + VREF
1 )
R
21
R
22
with an internal reference voltage V
REF typical 0.6V
SW1
FB1
SW2
ADJ2
DEF_1
VIN3.3V – 6V
VIN
EN_1
EN_2
MODE/
DATA
TPS62420
GND
L1
C
10 F
IN
m
2.2 H
m
R11
270kW
R12
180kW
V
=1.5V
upto600mA
OUT1
C
=22 F
OUT1
m
V
=2.85V
upto1000mA
OUT2
L2
Cff2
33pF
3.3 H
m
R21
825kW
R22
220kW
C
=22 F
OUT2
m
www.ti.com
SLVS676C – JUNE 2006 – REVISED JUNE 2010
APPLICATION INFORMATION
OUTPUT VOLTAGE SETTING
Converter1 Adjustable Default Output Voltage Setting
The output voltage can be calculated to:
(4)
To keep the operating current to a minimum, it is recommended to select R12 within a range of 180k to 360k.
The sum of R12 and R11 should not exceed ~1M. For higher output voltages than 3.3V, it is recommended to
choose lower values than 180k
for R12. Route the DEF_1 line away from noise sources, such as the inductor
or the SW1 line. The FB1 line needs to be directly connected to the output capacitor. An internal feed forward
capacitor is connected to this pin, therefore there is no need for an external feed forward capacitor for converter
1.
Converter 2
The default output voltage of converter 2 can be set by an external resistor network. For converter 2 the same
recommendations apply as for converter 1. In addition to that, a 33pF external feed forward capacitor Cff2 for
good load transient response must be used.
The output voltage can be calculated to:
(5)
Route the ADJ2 line away from noise sources, such as the inductor or the SW2 line. In case the interface is used
for converter2, connect ADJ2 pin directly to VOUT2
Figure 34. Typical Application Circuit 1.5V/2.85V Adjustable Outputs
Copyright 2006–2010, Texas Instruments Incorporated
25
Product Folder Link(s): TPS62420 TPS62421
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