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LM22676 データシート(PDF) 10 Page - Texas Instruments

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部品番号 LM22676
部品情報  LM22676/-Q1 42 V, 3 A SIMPLE SWITCHER짰 Step-Down Voltage Regulator with Features
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI - Texas Instruments

LM22676 データシート(HTML) 10 Page - Texas Instruments

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FREQUENCY (Hz)
-ADJ
-5.0
9
OUT
L C
1.1 10-
×
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´
LM22676, LM22676-Q1
SNVS587L – SEPTEMBER 2008 – REVISED NOVEMBER 2014
www.ti.com
Feature Description (continued)
7.3.4 Internal Compensation
The LM22676 device has internal loop compensation designed to provide a stable regulator over a wide range of
external power stage components.
The internal compensation of the -ADJ option is optimized for output voltages below 5 V. If an output voltage of 5
V or greater is needed, the -5.0 option with an external resistor divider can be used.
Ensuring stability of a design with a specific power stage (inductor and output capacitor) can be tricky. The
LM22676 stability can be verified using the WEBENCH Designer online circuit simulation tool. A quick start
spreadsheet can also be downloaded from the online product folder.
The complete transfer function for the regulator loop is found by combining the compensation and power stage
transfer functions. The LM22676 has internal type III loop compensation, as detailed in Figure 11. This is the
approximate "straight line" function from the FB pin to the input of the PWM modulator. The power stage transfer
function consists of a dc gain and a second order pole created by the inductor and output capacitor(s). Due to
the input voltage feedforward employed in the LM22676, the power stage dc gain is fixed at 20 dB. The second
order pole is characterized by its resonant frequency and its quality factor (Q). For a first pass design, the
product of inductance and output capacitance should conform to Equation 3.
(3)
Alternatively, this pole should be placed between 1.5 kHz and 15 kHz and is determined by Equation 4.
(4)
The Q factor depends on the parasitic resistance of the power stage components and is not typically in the
control of the designer. Of course, loop compensation is only one consideration when selecting power stage
components; see the Application Information section for more details.
Figure 11. Compensator Gain
In general, hand calculations or simulations can only aid in selecting good power stage components. Good
design practice dictates that load and line transient testing should be done to verify the stability of the application.
Also, Bode plot measurements should be made to determine stability margins. AN-1889 How to Measure the
Loop Transfer Function of Power Supplies (SNVA364) shows how to perform a loop transfer function
measurement with only an oscilloscope and function generator.
7.4 Device Functional Modes
7.4.1 Current Limit
The LM22676 has current limiting to prevent the switch current from exceeding safe values during an accidental
overload on the output. This peak current limit is found in the Electrical Characteristics under the heading of ICL.
The maximum load current that can be provided, before current limit is reached, is determined from Equation 5.
10
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Copyright © 2008–2014, Texas Instruments Incorporated
Product Folder Links: LM22676 LM22676-Q1


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