LM3429MH National Semiconductor, LM3429MH Datasheet
LM3429MH
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LM3429MH Summary of contents
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... The LM3429 comes in a low profile, thermally efficient TSSOP EP 14-lead package. The LM3429Q1 is an Automotive Grade product that is AEC- Q100 grade 1 qualified Typical Boost Application Circuit © 2010 National Semiconductor Corporation LM3429 LM3429Q1 Features ■ LM3429Q1 is an Automotive Grade product that is AEC- Q100 grade 1 qualified (-40° ...
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... Connection Diagram Ordering Information Order Number Spec. Package Type LM3429MH NOPB TSSOP-14 EP LM3429MHX NOPB TSSOP-14 EP LM3429Q1MH NOPB TSSOP-14 EP LM3429Q1MHX NOPB TSSOP-14 EP *Automotive Grade (Q) product incorporates enhanced manufacturing and support processes for the automotive market, including defect detection methodologies. Reliability qualification is compliant with the requirements and temperature grades defined in the AEC-Q100 standard. Automotive grade products are identified with the letter Q ...
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... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications nDIM IN OVP, HSP, HSN RCT - continuous COMP, CSH GATE - continuous Electrical Characteristics Specifications in standard type face are for T Range ( T = −40°C to +125°C). Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical ...
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Symbol Parameter PWM COMPARATOR COMP to PWM Offset CURRENT LIMIT (IS) V Current Limit Threshold LIM V Delay to Output LIM t Leading Edge Blanking ON-MIN Time HIGH SIDE TRANSCONDUCTANCE AMPLIFIER Input Bias Current Transconductance Input Offset Current Input Offset ...
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Typical Performance Characteristics Boost Efficiency vs. Input Voltage V = 32V (9 LEDs) (Note O Boost LED Current vs. Input Voltage (Note V = 32V (9 LEDs) O Analog Dimming (Note V = 20V (6 LEDs =+25°C and ...
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V vs. Junction Temperature CSH V vs. Junction Temperature RCT t vs. Junction Temperature ON-MIN www.national.com V vs. Junction Temperature CC 300944b0 V vs. Junction Temperature LIM 300944b2 300944b4 6 300944b1 300944b3 ...
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Block Diagram Theory of Operation The LM3429 is an N-channel MosFET (NFET) controller for buck, boost and buck-boost current regulators which are ideal for driving LED loads. The controller has wide input voltage range allowing for regulation of a variety ...
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The average output LED current (I LED average inductor current ( therefore trolled, I will be well regulated. As the system changes LED input voltage or output voltage, the ideal duty cycle (D) is var- ...
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Adding a PNP transistor as shown in constant ripple over varying FIGURE 3. Off-timer Circuitry for Buck Regulators The switching frequency is defined: Buck (Constant Ripple vs Buck (Constant Ripple vs ...
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ANALOG DIMMING The CSH pin can be used to analog dim the LED current by adjusting the current sense voltage (V different methods to adjust V using the CSH pin: SNS 1. External variable resistance : Adjust a potentiometer placed ...
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CONTROL LOOP COMPENSATION The LM3429 control loop is modeled like any current mode controller. Using a first order approximation, the uncompen- sated loop can be modeled as a single pole created by the output capacitor and, in the boost and ...
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To mitigate this problem, a compensator should be designed to give adequate phase margin (above 45°) at the crossover frequency. A simple compensator using a single capacitor at the COMP pin (C ) will add a dominant pole to the ...
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INPUT UNDER-VOLTAGE LOCKOUT (UVLO) The nDIM pin is a dual-function input that features an accurate 1.24V threshold with programmable hysteresis as shown in Figure 12. This pin functions as both the PWM dimming input for the LEDs and as a ...
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Design Considerations This section describes the application level considerations when designing with the LM3429. For corresponding calcu- lations, refer to the Design Guide section. INDUCTOR The inductor (L1) is the main energy storage device in a switching regulator. Depending on ...
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N-CHANNEL MosFET (NFET) The LM3429 requires an external NFET (Q1) as the main power MosFET for the switching regulator recommend have a voltage rating at least 15% higher than the maximum transistor voltage to ensure safe ...
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Basic Topology Schematics BOOST REGULATOR (V < BUCK REGULATOR (V > www.national.com 16 30094422 30094451 ...
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BUCK-BOOST REGULATOR 17 30094450 www.national.com ...
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Design Guide Refer to Basic Topology Schematics section. SPECIFICATIONS Number of series LEDs: N Single LED forward voltage: V LED Single LED dynamic resistance: r LED Nominal input voltage Input voltage range IN-MAX IN-MIN Switching ...
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LED RIPPLE CURRENT Set the nominal LED ripple current (Δi LED-PP the output capacitance ( Buck Boost and Buck-boost To set the worst case LED ripple current, use D solving for The minimum allowable ...
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A high frequency compensation pole (ω attenuate switching noise and provide better gain margin. As- = 10Ω, C suming R is calculated according to the higher FS FS value of the pole and the RHP zero of the system (shown ...
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The current rating should be at least 10% higher than the maximum average diode current (I D-MAX Buck Boost and Buck-boost Replace D with D in the I equation to solve for the MAX D-MAX average diode current (I ). ...
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Design Example #1 BUCK-BOOST APPLICATION - 6 LEDs at 1A SPECIFICATIONS 3.5V LED r = 325 mΩ LED V = 24V 10V IN-MIN V = 70V IN-MAX f = 700 kHz SW ...
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AVERAGE LED CURRENT Solve for R : SNS Assume R = 12.4 kΩ and solve for R CSH The closest standard resistor for R is actually 0.1Ω and for SNS R is actually 1 kΩ therefore I is: HSP ...
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T is approximated ensure stability, calculate ω Solve for C : CMP To attenuate switching noise, calculate ω = 10Ω and solve for C Assume The chosen components from step 7 are: 8. ...
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... VISHAY 499 kΩ 1% VISHAY 0.1Ω VISHAY 35.7 kΩ 1% VISHAY 21 kΩ 1% VISHAY 150 kΩ 1% VISHAY 25 is: HYSO : TURN-OFF Part Number LM3429MH GRM21BR71E224KA01L GRM21BR71C225KA12L GRM21BR71E104KA01L C5750X7R2A475K C4532X7R1H685K 08055A470JAT2A GRM2165C1H102JA01D 12CWQ10FNPBF MSS1278-333MLB FDD3682 MMBT5401 CRCW080512K4FKEA CRCW080510R0FKEA CRCW08051K00FKEA WSL2512R0400FEA CRCW080515K8FKEA CRCW0805499KFKEA ...
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... VISHAY 499 kΩ 1% VISHAY 0.1Ω VISHAY 35.7 kΩ 1% VISHAY 1.82 kΩ 1% VISHAY 10 kΩ 1% VISHAY 17.8 kΩ 1% VISHAY 26 300944h5 Part Number LM3429MH GRM21BR71E104KA01L GRM21BR71C225KA12L C4532X7R1H685K 08055A470JAT2A GRM2165C1H102JA01D CDBC560-G MSS1278-333MLB SI4436DY 2N7002ET1G CRCW080512K4FKEA CRCW080510R0FKEA CRCW08051K00FKEA WSL2512R0600FEA CRCW0805499KFKEA WSL2512R1000FEA CRCW080535K7FKEA ...
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... VISHAY 18.2 kΩ 1% VISHAY 499 kΩ 1% VISHAY 0.05Ω VISHAY 41.2 kΩ 1% VISHAY 21 kΩ 1% VISHAY 150 kΩ 1% VISHAY 27 300944h6 Part Number LM3429MH GRM21BR71A105KA01L GRM21BR71C225KA12L GRM21BR71E104KA01L C4532X7R1H685K 08055A470JAT2A GRM2165C1H102JA01D CDBC560-G MSS1278-223MLB SI4436DY MMBT5401 3352P-1-105 CRCW080512K4FKEA CRCW080510R0FKEA CRCW08051K00FKEA WSL2512R0400FEA CRCW080518K2FKEA ...
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... R UV1 10Ω 1% 1.05 kΩ 1% 0.06Ω 4.99 kΩ 1% 499 kΩ 1% 0.15Ω 35.7 kΩ 1% 100 kΩ precision reference 28 300944h7 Manufacturer Part Number NSC LM3429MH MURATA GRM21BR71A105KA01L MURATA GRM21BR71C225KA12L MURATA GRM21BR71E104KA01L TDK C4532X7R1H685K AVX 08055A470JAT2A GRM2165C1H102JA01D VISHAY 12CWQ10FNPBF COILCRAFT MSS1278-473MLB FAIRCHILD ...
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... VISHAY 499 kΩ 1% VISHAY 0.2Ω VISHAY 35.7 kΩ 1% VISHAY 1.43 kΩ 1% VISHAY 10 kΩ 1% VISHAY 17.4 kΩ 1% VISHAY 29 300944h9 Part Number LM3429MH GRM21BR71E684KA88L GRM21BR71C225KA12L GRM21BR71E104KA01L C5750X7R2A475K C4532X7R1H685K 08055A470JAT2A GRM2165C1H102JA01D 12CWQ10FNPBF BAT54T1G MSS1278-683MLB FDD3682 MMBT5401 CRCW080512K4FKEA CRCW080510R0FKEA CRCW08051K00FKEA CRCW080515K8FKEA ...
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... VISHAY 0.04Ω VISHAY 21.5 kΩ 1% VISHAY 499 kΩ 1% VISHAY 0.08Ω VISHAY 11.5 kΩ 1% VISHAY 100 kΩ 1% VISHAY 30 300944h8 Part Number LM3429MH GRM21BR71H153KA01L GRM21BR71C225KA12L GRM21BR71H103KA01L C4532X7R1H685K C4532X7R1H105K 08055A470JAT2A GRM2165C1H102JA01D CDBC560-G MSS1278-223MLB SI4436DY MMBT5401 CRCW080512K4FKEA CRCW080549K9FKEA CRCW080510R0FKEA CRCW08051K00FKEA WSL2512R0400FEA ...
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... VISHAY 1.0 kΩ 1% VISHAY 0.04Ω VISHAY 499 kΩ 1% VISHAY 49.9 kΩ 1% VISHAY 13.7 kΩ 1% VISHAY 150 kΩ 1% VISHAY 31 300944i0 Part Number LM3429MH GRM21BR71E104KA01L GRM21BR71C225KA12L GRM21BR71E104KA01L C5750X7R2A475K C4532X7R1H685K 08055A470JAT2A GRM2165C1H102JA01D 12CWQ10FNPBF MSS1278-223MLB FDD3682 MMBT5401 CRCW080512K4FKEA CRCW080510R0FKEA CRCW08051K00FKEA WSL2512R0400FEA CRCW0805499KFKEA CRCW080549K9FKEA ...
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... VISHAY 0.04Ω VISHAY 15.8 kΩ 1% VISHAY 499 kΩ 1% VISHAY 0.1Ω VISHAY 49.9 kΩ 1% VISHAY 100 kΩ 1% VISHAY 32 300944i8 Part Number LM3429MH GRM21BR71E474KA01L GRM21BR71C225KA12L GRM21BR71E104KA01L C4532X7R1H685K 08055A470JAT2A C4532X7R2A105K GRM2165C1H102JA01D CDBC560-G DO3340P-683 SI4436DY 2N7002ET1G CRCW080512K4FKEA CRCW080510R0FKEA CRCW0805750RFKEA WSL2512R0400FEA CRCW080515K8FKEA ...
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Physical Dimensions inches (millimeters) unless otherwise noted For Ordering, Refer to Ordering Information Table TSSOP-14 Pin EP Package (MXA) NS Package Number MXA14A 33 www.national.com ...
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