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LM3402HVMRX 数据表(PDF) 10 Page - Texas Instruments

部件名 LM3402HVMRX
功能描述  0.5A Constant Current Buck Regulator
Download  39 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

LM3402HVMRX 数据表(HTML) 10 Page - Texas Instruments

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tON = 1.34 x 10
-10 x
RON
VIN
BOOT
VCC
VIN
SW
CS
DIM
RON
GND
VIN
SENSE
7V BIAS
REGULATOR
BYPASS
SWITCH
VCC
UVLO
THERMAL
SHUTDOWN
ON TIMER
RON
Complete
Start
+
-
300 ns MIN
OFF TIMER
Complete
Start
LOGIC
+
-
+
-
+
-
CURRENT
LIMIT OFF
TIMER
BUCK
SWITCH
CURRENT
SENSE
LEVEL
SHIFT
GATE DRIVE
UVLO
VIN
+
-
0.735A
0.7V
0.2V
0.3V
1.5V
5V
75 PA
SD
LM3402, LM3402HV
SNVS450F – SEPTEMBER 2006 – REVISED OCTOBER 2015
www.ti.com
7 Detailed Description
7.1 Overview
The LM3402 and LM3402HV are buck regulators with a wide input voltage range, low voltage reference, and a
fast output enable/disable function. These features combine to make them ideal for use as a constant current
source for LEDs with forward currents as high as 500 mA. The controlled ON-time (COT) architecture is a
combination of hysteretic mode control and a one-shot ON-timer that varies inversely with input voltage.
Hysteretic operation eliminates the need for small-signal control loop compensation. When the converter runs in
continuous conduction mode (CCM) the controlled ON-time maintains a constant switching frequency over the
range of input voltage. Fast transient response, PWM dimming, a low power shutdown mode, and simple output
overvoltage protection round out the functions of the LM3402/HV.
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 Controlled ON-time Overview
Figure 17 shows the feedback system used to control the current through an array of LEDs. A voltage signal,
VSNS, is created as the LED current flows through the current setting resistor, RSNS, to ground. VSNS is fed back
to the CS pin, where it is compared against a 200-mV reference, VREF. The ON-comparator turns on the power
MOSFET when VSNS falls below VREF. The power MOSFET conducts for a controlled ON-time, tON, set by an
external resistor, RON, and by the input voltage, VIN. ON-time is governed using Equation 1.
(1)
10
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Copyright © 2006–2015, Texas Instruments Incorporated
Product Folder Links: LM3402 LM3402HV


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