參數(shù)資料
型號(hào)： TPS62122DRV
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, PDSO6
封裝： 2 X 2 MM, GREEN, PLASTIC, SON-6
文件頁(yè)數(shù)： 14/33頁(yè)
文件大?。?/td> 5549K
代理商： TPS62122DRV
VIN
EN
FB
TPS62120
PG
L 22 H
SW
C
4.7 F
OUT
V
1.8 V
100 A
OUT
GND
R1
R2
SGND
VOUT
C
10
IN
F
300 kW
240 kW
Cff
Rpullup
PWR GOOD
100 kW
22 pF
DC
12 V
1 kW
High Impedance
Source
(
)
(
)
1
2
OUT
REF
R
OUT
REF
R
V
1
2
V
= V
1 +
with an internal reference voltage VREF typical 0.8 V
R =
1
R
-
z
1
f f
1
=
= 25 kHz
2
R
C
f
p
1
C
=
2
R
25 kHz
ff
p
www.ti.com
SLVSAD5 – JULY 2010
Figure 38. TPS62120 1.8V VOUT Configuration Powered from a High-Impedance Source
OUTPUT VOLTAGE SETTING
The output voltage can be calculated to:
(5)
To minimize the current through the feedback divider network, R2 should be within the range of 82kΩ to 360k.
The sum of R1 and R2 should not exceed ~1MΩ, to keep the network robust against noise. An external
feed-forward capacitor Cff is required for optimum regulation performance. R1 and Cff places a zero in the
feedback loop.
(6)
The value for Cff can be calculated as:
(7)
Table 1 shows a selection of suggested values for the feedback divider network for most common output
voltages.
Table 1. Suggested Values for Feedback Divider Network
Voltage Setting [V]
3.06
3.29
2.00
1.80
1.20
5.00
R1 [k
]
510
560
360
300
180
430
R2 [k
]
180
240
360
82
Cff [pF]
15
22
27
15
OUTPUT FILTER DESIGN (INDUCTOR AND OUTPUT CAPACITOR)
The TPS6212X operates with effective inductance values in the range of 10H to 33H and with effective output
capacitance in the range of 1F to 33F. The device is optimized to operate for an output filter of L = 22H and
COUT = 4.7F. Larger or smaller inductor/capacitor values can be used to optimize the performance of the device
for specific operation conditions. For more details, see the CHECKING LOOP STABILITY section.
Copyright 2010, Texas Instruments Incorporated
21
Product Folder Link(s): TPS62120 TPS62122
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