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參數(shù)資料
| 型號(hào)： | TPS2058D |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | QUAD CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES |
| 中文描述： | 四限流配電開關(guān) |
| 文件頁數(shù)： | 16/24頁 |
| 文件大?。?/td> | 424K |
| 代理商： | TPS2058D |
TPS2048, TPS2058
QUAD CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES
SLVS192 – APRIL 1999
16
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
power supply considerations
A 0.01-
μ
F to 0.1-
μ
F ceramic bypass capacitor between IN and GND, close to the device, is recommended.
Placing a high-value electrolytic capacitor on the output pin(s) is recommended when the output load is heavy.
This precaution reduces power-supply transients that may cause ringing on the input. Additionally, bypassing
the output with a 0.01-
μ
F to 0.1-
μ
F ceramic capacitor improves the immunity of the device to short-circuit
transients.
overcurrent
A sense FET checks for overcurrent conditions. Unlike current-sense resistors, sense FETs do not increase the
series resistance of the current path. When an overcurrent condition is detected, the device maintains a
constant output current and reduces the output voltage accordingly. Complete shutdown occurs only if the fault
is present long enough to activate thermal limiting.
Three possible overload conditions can occur. In the first condition, the output has been shorted before the
device is enabled or before V
I(INx)
has been applied (see Figure 6). The TPS2048 and TPS2058 sense the short
and immediately switch into a constant-current output.
In the second condition, the short occurs while the device is enabled. At the instant the short occurs, very high
currents may flow for a short time before the current-limit circuit can react . After the current-limit circuit has
tripped (reached the overcurrent trip threshhold) the device switches into constant-current mode.
In the third condition, the load has been gradually increased beyond the recommended operating current. The
current is permitted to rise until the current-limit threshold is reached or until the thermal limit of the device is
exceeded (see Figure 7). The TPS2048 and TPS2058 are capable of delivering current up to the current-limit
threshold without damaging the device. Once the threshold has been reached, the device switches into its
constant-current mode.
OC response
The OC open-drain output is asserted (active low) when an overcurrent or overtemperature condition is
encountered. The output will remain asserted until the overcurrent or overtemperature condition is removed.
Connecting a heavy capacitive load to an enabled device can cause momentary false overcurrent reporting from
the inrush current flowing through the device, charging the downstream capacitor. An RC filter of 500
μ
s (see
Figure 30) can be connected to OCx to reduce false overcurrent reporting caused by hot-plug switching events
or extremly high capacitive loads. Using low-ESR electrolytic capacitors on the output lowers the inrush current
flow through the device during hot-plug events by providing a low impedance energy source, thereby reducing
erroneous overcurrent reporting.
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