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参数资料
| 型号： | TPS62111RSATG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2.4 A SWITCHING REGULATOR, 1100 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封装： | GREEN, PLASTIC, QFN-16 |
| 文件页数： | 7/28页 |
| 文件大小： | 842K |
| 代理商： | TPS62111RSATG4 |
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SYNC
GND
PGND
SW
R1
560kW
R2
300kW
VO =3.3V
6.8 H
m
C =22 F
6.3V
O
m
VIN
LBI
C =10 F
25V
I
m
1 F
m
2
3
4
8
9
7
5
11
12
16
10
6
13
14
15
1
V =4.3Vto17V
I
VIN
EN
VINA
PGND
GND PwPD
R5
R6
AGND
TPS62110
SW
LBO
PG
R3
R7
R4
FB
Cff
10pF
ENABLE/Low-Battery Detector (Enhanced Version) TPS62113 Only
NO-LOAD OPERATION
THEORY OF OPERATION / DESIGN PROCEDURE
Inductor Selection
www.ti.com .................................................................................................................................................... SLVS585A – JULY 2005 – REVISED FEBRUARY 2009
DETAILED DESCRIPTION (continued)
Figure 19. LBI With Increased Hysteresis
The TPS62113 offers an enhanced LBI functionality to provide a precise, user-programmable undervoltage
shutdown. No additional supply voltage supervisor (SVS) is needed to provide this function. When the enable
(EN) pin is pulled high, only the internal bandgap voltage reference is switched on to provide a reference source
for the LBI comparator. As long as the voltage at LBI is less than the LBI trip point, all other internal circuits are
shut down, reducing the supply current to 10 A. As soon as input voltage at LBI rises above the LBI trip point of
1.256 V, the device is completely enabled and starts switching.
When the converter operates in the forced PWM mode and there is no load connected to the output, the
converter regulates the output voltage by allowing the inductor current to reverse for a short time.
Table 1. List of Inductors
MANUFACTURER
PART NO.
INDUCTANCE
DC RESISTANCE
SATURATION CURRENT
Coilcraft
MSS6132-682
6.8 H
65 m
(max)
1.5 A
HA3808-AL
6.8 H
99 m
(typ)
4.4A
Epcos
B82462G4682M
6.8 H
50 m
(max)
1.5 A
Sumida
CDRH5D28-6R2
6.2 H
33 m
(typ)
1.8 A
SLF6028T-6R8M1R5
6.8 H
35 m
(typ)
1.5 A
TDK
SLF7032T-6R8M1R6
6.8 H
41 m
(typ)
1.6 A
7447789006
6.8 H
44 m
(typ)
2.75 A
Wurth
7447779006
6.8 H
33 m
(typ)
3.3 A
744053006
6.2 H
45 m
(typ)
1.8 A
The control loop of the TPS6211x family requires a certain value for the output inductor and the output capacitor
for stable operation. As long as the nominal value of L × C
≥ 6.2 H × 22 F, the control loop has enough phase
margin and the device is stable. Reducing the inductor value without increasing the output capacitor (or vice
versa) may cause stability problems. There are applications where it may be useful to increase the value of the
Copyright 2005–2009, Texas Instruments Incorporated
15
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