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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)： | 8/29頁 |
| 文件大?。?/td> | 427K |
| 代理商： | TPS2306DWG4 |
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TPS2306
DUAL SEQUENCING HOT SWAP POWER MANAGER
SLVS368 APRIL 2001
16
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
Note that the relative occurrence of time t2 within the t1 to t3 window is influenced by a number of factors. Large
input capacitance and higher ON thresholds of the external FET delay turn-on of the FET, resulting in reduced
output ramp during the first stage. For the TPS2306 parameters, a higher source impedance, smaller slow ramp
current, and a shorter slow ramp period (t1 to t3) all act to reduce the output ramp during this period. Under some
conditions, it’s possible that only imperceptible voltage ramping occurs during the slow ramp period, in which
case all significant output charging occurs after time t3.
determining component values
To demonstrate the process of determining the programming component values for a TPS2306-based hot swap
circuit, a design procedure is detailed here to show the derivation of the values used in the Figure 2 schematic.
For this example, the following system specs were established:
V
IN1 = 5.0 Vdc ± 10%
VIN2 = 3.3 Vdc ± 5%
C
LOAD1 = 100 FCLOAD2 = 300 F
I
L1 = 0.50 A
IL2 = 1.5 A
IMAX1
= 1.0 A
IMAX2 = 3.0 A
The IMAX1 and IMAX2 currents are the constant-current mode sourcing levels that are used for fast charging
of the load input capacitance during start-up of the two hot swap channels. To avoid unexpected interruption
of the supply currents during normal loading conditions, the constant-current levels must be set above the
anticipated load current values.
setting the sense resistor values
The sense resistors are used to feed the load current information back to the TPS2306 LCAs and overload
comparators. The values of these resistors can be set by considering the resultant drop under normal
(steady-state) loading conditions. For the Figure 2 application, the drop was limited to 20 mV on each channel.
Given nominal loading conditions, the sense resistors should be set as follows.
R
SNS1 +
V
DROP1
I
L1
+ 20 mV
0.5 A
+ 40 mW
and
R
SNS2 +
V
DROP2
I
L2
+ 20 mV
2.0 A
+ 10 mW
where:
V
DROP1, VDROP2 = the target voltage drop under nominal loading conditions
I
L1, IL2= the respective load currents of each channel
(1)
(2)
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