參數(shù)資料
型號(hào)： TPS2393APWRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14
封裝： GREEN, PLASTIC, TSSOP-14
文件頁(yè)數(shù)： 14/30頁(yè)
文件大?。?/td> 665K
代理商： TPS2393APWRG4
TPS2393A
SLUS610 JULY 2004
21
www.ti.com
APPLICATION INFORMATION
Setting the Undervoltage and Overvoltage Thresholds
The UVLO and OVLO 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 GATE pin is held low, disconnecting
power from the load, and deasserting the PG output. When input voltage is within the UV/OV window, the GATE
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.
UDG20119
R8
R2
R1
R7
GND
48V
GND
48V
VIN
RTN
TPS2393A*
UVLO
OVLO
1
14
11
8
VIN
RTN
TPS2393A*
UVLO
OVLO
1
14
11
8
R1
200 k
1%
R2
4.99 k
1%
R3
3.92 k
1%
(a)
(b)
V
OV_L +
R1
) R2 ) R3
R3
V
REF * ISRC_UV
R1
V
UV_L +
R1
) R2 ) R3
R2
) R3
V
REF
V
OV_L +
R7
) R8
R8
V
TH_OV
V
UV_L +
R1
) R2
R2
V
TH_UV
*Additional details omitted for clarity.
Figure 25. Programming the Undervoltage and Overvoltage Thresholds
The UV and OV thresholds can be individually programmed with a three-resistor divider connected to it as
shown in the typical application diagram, and again in Figure 27a. 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. Generally, the process is simplest by first selecting the top leg of the
divider (R1 in the diagram) needed to obtain the threshold hysteresis. This value is calculated from equation (9).
R1
+
V
HYS_UV
10
mA
where:
D VHYS_UV is the undervoltage hysteresis value
(9)
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