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參數(shù)資料
| 型號(hào)： | 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)： | 13/29頁 |
| 文件大小： | 427K |
| 代理商： | TPS2306DWG4 |
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TPS2306
DUAL SEQUENCING HOT SWAP POWER MANAGER
SLVS368 APRIL 2001
20
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
One method of using the UPx and DOWNx inputs to control sequencing is to use resistor dividers across the
loads to sense load status. The dividers scale the output voltages to set the desired value at which controlled
channel should ramp up or turn off. In the Figure 2 application, the pull-up on the UP2 input causes the 3.3-V
supply to ramp up first, when the enable and input conditions are met. Resistors R2A and R2B form a divider
on the 3.3V_OUT node; as this output ramps up, its status is fed back to the UP1 input to control the turn-on
of the 5.0-V output. From the diagram, it can be seen that the voltage at the UP1 pin can be determined from
the simple divider equation; therefore, the value of the R2B resistor (the bottom leg of the divider) can be
selected from:
R2B
+
V
UP
V
RAMP *
V
UP
R2A
where:
V
UP = the UPx comparator reference voltage
V
RAMP = the desired output voltage of the primary channel at which the secondary channel starts to
ramp
The maximum threshold specification can be used to set the maximum output level at which the second channel
is enabled. In this case, equation 11 becomes:
R2B
+
1.65 V
V
RAMP *
1.65 V
R2A
For the example application, the 5.0-V supply is to be ramped after the 3.3-V supply has nearly attained its
steady-state level. To ensure operation over the supply tolerance window, this voltage was set to a maximum
of 3.0 V. If R2A is set to 10 k
, the value R2B = 12.2 k results from equation 12. If the standard value of 12.1 k
is selected, the channel 1 output starts ramping at a nominal voltage of:
V
RAMP +
22.1 k
W
12.1 k
W
1.5 V
^ 2.74 V
Similarly, the turn-off threshold for channel 2 is determined by the R1A/R1B divider equation. In this example,
DOWN1 was tied low (to ground) to turn off the 5.0-V supply when the enable is deasserted. As the 5.0V_OUT
node decays, its status is fed back to the DOWN2 input. Therefore, a resistor value for R1B can be found from:
R1B
+
V
DN
V
OFF *
V
DN
R1A
where:
V
DN = the DNx comparator reference voltage
V
OFF = the desired voltage of the turn-off control channel at which the controlled channel gate drive is
turned off
If R1A is set to 10 k
, and channel 2 turn-off should be after the +5.0V_OUT node has decayed to less than
2.50 V, then equation 14 becomes:
(11)
(12)
(13)
(14)
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