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參數(shù)資料
| 型號： | TPS2459RHBR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| 封裝： | PLASTIC, QFP-32 |
| 文件頁數(shù)： | 24/44頁 |
| 文件大?。?/td> | 983K |
| 代理商： | TPS2459RHBR |
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PRODUCTPREVIEW
12-V ORing for High-Power Loads
( )
LOAD
SENSE
DS on PASS
DS on BLK
10 m V
I
R
>
+
UDG-09034
V
G
A
T
E
GND
12 HP = 0
1
0
m
V
OR
–
3
m
V
G
A
T
E
GND
12 HP = 1
1
0
m
V
OR
3
m
V
25 V
SLUS917 – FEBRUARY 2009 ............................................................................................................................................................................................ www.ti.com
The 12HP bit adjusts the ORing turn-off threshold of the 12-V channel. Clearing the bit sets the ORing turn-off
threshold to the default nominal value of -3 mV. Setting the bit shifts the threshold up by 6 mV to a nominal value
of +3 mV (Figure 8). Shifting the turn-off threshold to a positive value ensures that the blocking FET shuts off
before any reverse current flows.
A light load may not draw sufficient current to keep the input-to-output differential VIN12-OUT12 above 3 mV.
When this happens, the blocking FET shuts off and then the differential voltage increases until it turns back on.
This process endlessly repeats, wasting power and generating noise. Therefore 12HP should only be set for
high-power loads that satisfy the relationship.
where
I
LOAD is the current drawn by the load
R
SENSE is the value of the sense resistor
R
DS(on)PASS is the maximum on-resistance of the pass FET
R
DS(on)BLK equals the maximum on-resistance of the blocking FET
For example, if RSENSE = RHSFET = RORFET = 5 m, then a high-power load must always draw at least 667 mA.
Most, although not all, AdvancedMC loads can benefit from using the high-power bit 12HP.
Figure 25 shows the different ORing thresholds in high power and low power applications.
Figure 25.
30
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS2459
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