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參數(shù)資料
| 型號： | TPS2350DRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14 |
| 封裝： | GREEN, PLASTIC, MS-012AB, SOIC-14 |
| 文件頁數(shù)： | 4/26頁 |
| 文件大小： | 596K |
| 代理商： | TPS2350DRG4 |
3
4
TPS2350
11
10
7
9
8
2
12
RTN
PG
GA
T
SENSE
SOURCE
GATA
GATB
–VINB
–VINA
RAMP
FLTTIM
OV
UV
–VINB
POWER GOOD
Q1
Q2
Q4
Q3
Q5
1
5
6
14
13
R2
R1
R3
R6
R4
R7
R5
RTN
UDG03121
CFLT
CRAMP
FAULT
FLT
CLOAD
RLOAD
RSENSE
–VINA
SLUS574C
– JULY 2003 – REVISED MARCH 2011
APPLICATION INFORMATION
Supply Section
The supply selection comparator selects between
–VINA and –VINB based on which supply has a larger
magnitude. To prevent chattering between two nearly identical supplies, the supply selection comparator has 400
mV of hysteresis. This prevents supply noise or ripple from tripping the comparator and should be adequate for
most systems. Hysteresis is set to 400 mV to give the highest noise margin without allowing conduction in the
body diodes of the supply selection FETs.
For systems with many cards, high current cards, or long cables between the power and the load, the voltage
loss in the cable can be significant. If the supplies are close to the same magnitude, then the voltage loss in the
cable could cause enough drop to exceed the supply selection comparator hysteresis. In this case, the supply
selection comparator hysteresis must be increased.
TPS2350 allows you to increase the hysteresis of the supply selection comparator with external resistors, limited
to the threshold of the external FETs. Figure 15 shows a system with higher hysteresis, set by R4, R5, R6 and
R7. The resistors act as a simple multiplier to increase the voltage differential required to switch the comparator.
For example, for R4 = R5 = 40 k
Ω, and R6 = R7 = 20 kΩ, the hysteresis is approximately 1.2 V. Because of the
large hysteresis, the supply selection power FETs are replaced with dual power FETs, configured so that the
body diodes can never conduct. The GATA and GATB outputs are able to switch dual FETs, so no additional
drive or logic circuits are required.
Figure 15. Typical Application to Develop Higher Supply Comparator Hysteresis
12
Copyright
2003–2011, Texas Instruments Incorporated
Product Folder Link(s): TPS2350
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