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參數(shù)資料
| 型號： | TPS62751DSKR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.8 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 2.50 X 2.50 MM, GREEN, PLASTIC, SON-10 |
| 文件頁數(shù)： | 13/30頁 |
| 文件大?。?/td> | 1733K |
| 代理商： | TPS62751DSKR |
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LIM_U
1.23
Upper range: R
=
20000
I
÷
÷
è
LIM_L
1.23
Lower range: R
=
5400
I
÷
÷
è
+
470pF
SLVS955A – JULY 2009 – REVISED SEPTEMBER 2009 ................................................................................................................................................. www.ti.com
(7)
(8)
Examples of different input current limit values selectable are given in the table below:
AVERAGE INPUT
RESISTOR VALUE
CURRENT REQUIRED
50 mA
132.8 K
100 mA
66.5 K
400 mA
61.5 K
500 mA
49.2 K
600 mA
41 K
700 mA
35.1 K
CHECKING LOOP STABILITY
The first step of circuit and stability evaluation is to look from a steady-state perspective at the following signals:
Switching node, SW
Inductor current, IL
Output ripple voltage, VO(AC)
These are the basic signals that need to be measured when evaluating a switching converter. When the
switching waveform shows large duty cycle jitter or the output voltage or inductor current shows oscillations, the
regulation loop may be unstable. This is often a result of board layout and/or L-C combination.
As a next step in the evaluation of the regulation loop, the load transient response is tested. The time between
the application of the load transient and the turn on of the P-channel MOSFET, the output capacitor must supply
all of the current required by the load. VO immediately shifts by an amount equal to ΔI(LOAD) × ESR, where ESR is
the effective series resistance of CO. ΔI(LOAD) begins to charge or discharge CO generating a feedback error
signal used by the regulator to return VO to its steady-state value. The results are most easily interpreted when
the device operates in PWM mode.
During this recovery time, VO can be monitored for settling time, overshoot or ringing that helps judge the
converter’s stability. Without any ringing, the loop has usually more than 45° of phase margin. Because the
damping factor of the circuitry is directly related to several resistive parameters (e.g., MOSFET RDSon) that are
temperature dependant, the loop stability analysis has to be done over the input voltage range, load current
range, and temperature range.
Figure 27. Checking Loop Stability
20
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s) :TPS62750, TPS62751
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