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LM3481-Q1 Datasheet(PDF) 17 Page - Texas Instruments

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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]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM3481-Q1 Datasheet(HTML) 17 Page - Texas Instruments

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UVLO
VIN
R7
R8
IUVLO
VUVLOSEN
-
+
+
-
2
R7 =
§
¨
©
-1
VEN
1.43V
x
R8
R8 =
§
¨
©
1 +
1.43V ± VSH
VEN ± 1.43V
IUVLO
x
1.43V
FA/SYNC/SD
40 k:
DR
30 Ps
LM3481
LM3481, LM3481-Q1
www.ti.com
SNVS346F – NOVEMBER 2007 – REVISED NOVEMBER 2014
Feature Description (continued)
Figure 28. Shutdown Operation in Synchronization Mode
7.3.5 Undervoltage Lockout (UVLO) Pin
The UVLO pin provides user programmable enable and shutdown thresholds. The UVLO pin is compared to an
internal reference of 1.43 V (typical), and a resistor divider programs the enable threshold, VEN. When the IC is
enabled, a 5-
μA current is sourced out of the UVLO pin, which effectively causes a hysteresis, and the UVLO
shutdown threshold, VSH, is now lower than the enable threshold. Setting these thresholds requires two resistors
connected from the VIN pin to the UVLO pin and from the UVLO pin to GND (see Figure 29). Select the desired
enable, VEN, and UVLO shutdown, VSH, threshold voltages and use the Equation 17 and Equation 18 to
determine the resistance values:
(17)
(18)
Figure 29. UVLO Pin Resistor Divider
If the system is designed to work over wide input voltages, the voltage at the UVLO pin could exceed the voltage
limit for the UVLO pin. In this case a zener diode can be connected between the UVLO pin and ground to
prevent the UVLO voltage from rising above the maximum value.
If the UVLO pin function is not desired, select R8 and R7 of equal magnitude greater than 100 k
Ω. This will allow
VIN to be in control of the UVLO thresholds. The UVLO pin may also be used to implement the enable/disable
function. If a signal pulls the UVLO pin below the 1.43 V (typical) threshold, the converter will be disabled.
7.3.6 Short-Circuit Protection
When the voltage across the sense resistor (measured on the ISEN Pin) exceeds 220 mV, short-circuit current
limit gets activated. A comparator inside the LM3481 reduces the switching frequency by a factor of 8 and
maintains this condition until the short is removed.
Copyright © 2007–2014, Texas Instruments Incorporated
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