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参数资料
| 型号： | TPS2552DRVT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封装： | GREEN, PLASTIC, SON-6 |
| 文件页数： | 5/32页 |
| 文件大小： | 1025K |
| 代理商： | TPS2552DRVT |
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0.94
ILIM
0.977
ILIM
1.016
ILIM
22980V
OSmax
R
k
23950V
OSnom
R
k
25230V
OSmin
R
k
I
(mA) =
I
(mA) =
I
(mA) =
W
SLVS841D
– NOVEMBER 2008 – REVISED JUNE 2011
APPLICATION INFORMATION
INPUT AND OUTPUT CAPACITANCE
Input and output capacitance improves the performance of the device; the actual capacitance should be
optimized for the particular application. For all applications, a 0.1
μF or greater ceramic bypass capacitor between
IN and GND is recommended as close to the device as possible for local noise de-coupling. This precaution
reduces ringing on the input due to power-supply transients. Additional input capacitance may be needed on the
input to reduce voltage overshoot from exceeding the absolute maximum voltage of the device during heavy
transient conditions. This is especially important during bench testing when long, inductive cables are used to
connect the evaluation board to the bench power-supply.
Placing a high-value electrolytic capacitor on the output pin is recommended when large transient currents are
expected on the output.
PROGRAMMING THE CURRENT-LIMIT THRESHOLD
The overcurrent threshold is user programmable via an external resistor. The TPS2552/53 and TPS2552-1/53-1
use an internal regulation loop to provide a regulated voltage on the ILIM pin. The current-limit threshold is
proportional to the current sourced out of ILIM. The recommended 1% resistor range for RILIM is 15 k ≤ RILIM ≤
232 k
to ensure stability of the internal regulation loop. Many applications require that the minimum current limit
is above a certain current level or that the maximum current limit is below a certain current level, so it is
important to consider the tolerance of the overcurrent threshold when selecting a value for RILIM. The following
equations and Figure 24 can be used to calculate the resulting overcurrent threshold for a given external resistor
value (RILIM). Figure 24 includes current-limit tolerance due to variations caused by temperature and process.
However, the equations do not account for tolerance due to external resistor variation, so it is important to
account for this tolerance when selecting RILIM. The traces routing the RILIM resistor to the TPS2552/53 and
TPS2552-1/53-1 should be as short as possible to reduce parasitic effects on the current-limit accuracy.
RILIM can be selected to provide a current-limit threshold that occurs 1) above a minimum load current or 2)
below a maximum load current.
To design above a minimum current-limit threshold, find the intersection of RILIM and the maximum desired load
current on the IOS(min) curve and choose a value of RILIM below this value. Programming the current limit above a
minimum threshold is important to ensure start up into full load or heavy capacitive loads. The resulting maximum
current-limit threshold is the intersection of the selected value of RILIM and the IOS(max) curve.
To design below a maximum current-limit threshold, find the intersection of RILIM and the maximum desired load
current on the IOS(max) curve and choose a value of RILIM above this value. Programming the current limit below a
maximum threshold is important to avoid current limiting upstream power supplies causing the input voltage bus
to droop. The resulting minimum current-limit threshold is the intersection of the selected value of RILIM and the
IOS(min) curve.
Current-Limit Threshold Equations (IOS):
(1)
where 15 k
≤ RILIM ≤ 232 k.
Copyright
2008–2011, Texas Instruments Incorporated
13
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