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參數(shù)資料
| 型號： | TPS2306DWG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封裝： | SOIC-16 |
| 文件頁數(shù)： | 17/29頁 |
| 文件大?。?/td> | 427K |
| 代理商： | TPS2306DWG4 |
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TPS2306
DUAL SEQUENCING HOT SWAP POWER MANAGER
SLVS368 APRIL 2001
24
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
t
UP2 ^
C
L1
V
RAMP *
V
UV1
IMAX
1 *
I
L1
) t
VUV1
Once the total delay to the secondary channel start-up (tUP2) is known, substitution of the secondary channel
parameters into equations 21 and 22 (or 23) can be used to determine the total system start-up time. Substitute
τSS2 for τSS1, IMAX2 for IMAX1, etc. However, for these calculations, the constant t1 in equations 21 and 22
is now the quantity (tUP2 + tSR). This version of equation 21 is used to determine the time at which the secondary
channel load starts up, tVUV2 when v2(t) = VUV2. Finally, the system start-up time is calculated by substituting
the secondary channel parameters into equation 22 (or 23) (including tVUV2 for tVUV1) to model ν2(t) when the
output voltage is above the UVLO threshold.
setting the linear mode timeout
Once an estimate of the required charging time is obtained, the value of the timing capacitor CT can be derived.
Since the timeout is obtained via the constant-current charging of the external capacitor, the minimum capacitor
value is given by:
C
T(min) +
i
CT(max)
t
ST
V
F(min)
^ 48
10*6
t
ST
where:
i
CT(MAX) = the maximum CT charging current, 65 A
V
F(MIN) = the minimum fault threshold on the CT pin, 1.35 V
For the example application, a total start-up time of about 2.03 ms was obtained. Solving equation 24 using this
timeout value produces a result of CT(MIN) = 0.097 F; a 0.1-F value is shown in the schematic.
using the FAULT output
LED indicator
The TPS2306 FAULT output provides fault reporting capability to the system host. It is an open-drain output
which becomes high-impedance under any conditions which cause either of the GATEx outputs to be turned
off. It can be used to provide a visual indication of a fault by using it as an LED pre-driver, as shown in Figure 7.
(23)
(24)
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