LM3481-Q1 datasheet(15/38 Pages) TI | LM3481 / -Q1 High-Efficiency Controller for Boost, SEPIC and Flyback DC-DC Converters

Part No.	LM3481-Q1

Description	LM3481 / -Q1 High-Efficiency Controller for Boost, SEPIC and Flyback DC-DC Converters

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Manufacturer	TI [Texas Instruments]

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RFA =

fS

22 x 10

3

- 5.74

LM3481

DR

ISEN

RSEN

VIN

L1

D1

Q1

COUT

VOUT

RSL

+

CSEN

LM3481, LM3481-Q1

www.ti.com

SNVS346F – NOVEMBER 2007 – REVISED NOVEMBER 2014

Feature Description (continued)

It is good design practice to only add as much slope compensation as needed to avoid subharmonic oscillation.

Additional slope compensation minimizes the influence of the sensed current in the control loop. With very large

slope compensation the control loop characteristics are similar to a voltage mode regulator which compares the

error voltage to a saw tooth waveform rather than the inductor current.

Figure 23. Increasing the Slope of the Compensation Ramp

Figure 24.

ΔVSL vs RSL

7.3.4 Frequency Adjust, Synchronization, and Shutdown

The switching frequency of the LM3481 can be adjusted between 100 kHz and 1 MHz using a single external

resistor. This resistor must be connected between the FA/SYNC/SD pin and ground, as shown in Figure 25.

Refer to the Typical Characteristics to determine the value of the resistor required for a desired switching

frequency.

Equation 16 can also be used to estimate the frequency adjust resistor.

Where fS is in kHz and RFA in kΩ.

(16)

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