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参数资料
| 型号： | TPS2394PWR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14 |
| 封装： | PLASTIC, TSSOP-14 |
| 文件页数： | 5/18页 |
| 文件大小： | 356K |
| 代理商： | TPS2394PWR |
R1
200 k
1 %
R2
4.99 k
1 %
R3
3.92 k
1 %
R9
R2
R1
R8
GND
-48V
GND
-48V
SOURCE
RTN
TPS2394
(1)
UV
OV
1
7
3
4
SOURCE
RTN
TPS2394
(1)
UV
OV
1
7
3
4
V
UV_L =
R1 + R2 + R3
R2
R3
x V
THUV
V
OV_L =
R1 + R2 + R3
R3
x V
THOV
-I
HYSUV x R1
V
UV_L =
R1 + R2
R2
x V
THUV
V
OV_L =
R8 + R9
R9
x V
THOV
(a)
(b)
HYS_UV
V
R1 =
10
A
(
)
(
)
-
é
ù
ê
ú
-
ê
ú
-
ê
ú
UV_L
5
UV_L
OV_L
V
1.4
R1
R2 =
1
V
1.4
V
+ 10
R1
www.ti.com
SLVSAA9 – AUGUST 2010
Continuing this calculation example, using a 220-F input capacitor (CLOAD), Equation 3 and Equation 4 estimate
the load voltage ramping to approximately –45 V during the soft-start period. If the module should operate down
to –72-V input supply, approximately another 1.4 ms of constant-current charging may be required. Therefore,
Setting the Undervoltage and Overvoltage Thresholds
The UV and OV pins can be used to set the undervoltage (VUV) and overvoltage (VOV) thresholds of the hot swap
circuit. When the input supply is below VUV or above VOV, the GAT pin is held low, disconnecting power from the
load, and the PG output is deasserted. When input voltage is within the UV/OV window, the GAT pin drive is
enabled, assuming all other input conditions are valid for turn-on.
Threshold hysteresis is provided via two internal sources which are switched to either pin whenever the
corresponding input level exceeds the internal 1.4-V reference. The additional bias shifts the pin voltage in
proportion to the external resistance connected to it. This small voltage shift at the device pin is gained up by the
external divider to input supply levels.
Note (1): Additional details omitted for clarity.
Figure 10. Programming the Undervoltage and Overvoltage Thresholds
The UV and OV thresholds can be individually programmed with a three-resistor divider connected to the
TPS2394 as shown in the typical application diagram, and again in Figure 10a. When the desired trip voltages
and undervoltage hysteresis have been established for the protected board, the resistor values needed can be
determined from the following equations. First, select the top leg of the divider (R1 in the diagram) to obtain the
threshold hysteresis. This value is calculated using Equation 9.
(9)
Where:
VHYS_UV is the undervoltage hysteresis value
For example, assume the typical application design targets have been set to undervoltage turn-on at 33 V (input
supply rising), turn-off at 31 V (input voltage falling), and overvoltage shutdown at 72 V. Then Equation 9 yields
R1 = 200 k
Ω for the 2-V hysteresis. Once the value of R1 is selected, it is used to calculate resistors R2 and R3.
(10)
Copyright 2010, Texas Instruments Incorporated
13
Product Folder Link(s): TPS2394
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