LM3402HVMR National Semiconductor, LM3402HVMR Datasheet
LM3402HVMR
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LM3402HVMR Summary of contents
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... LEDs of varying number and type, LED dimming by pulse width modulation (PWM), broken/open LED protection, low-power shutdown and ther- mal shutdown complete the feature set. Typical Application © 2007 National Semiconductor Corporation Features ■ Integrated 0.5A N-channel MOSFET ■ ...
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... Connection Diagrams 8-Lead Plastic MSOP-8 Package NS Package Number MUA08A Ordering Information Order Number Package Type LM3402MM LM3402MMX MSOP-8 LM3402HVMM LM3402HVMMX LM3402MR LM3402MRX PSOP-8 LM3402HVMR LM3402HVMRX Pin Descriptions Pin(s) Name Description BOOT MOSFET drive bootstrap pin 3 DIM Input for PWM dimming 4 GND ...
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... Absolute Maximum Ratings (LM3402) (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. VIN to GND BOOT to GND SW to GND BOOT to VCC BOOT to SW VCC to GND DIM to GND CS to GND RON to GND Junction Temperature Storage Temp ...
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... Absolute Maximum Ratings (LM3402HV) (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. VIN to GND BOOT to GND SW to GND BOOT to VCC BOOT to SW VCC to GND DIM to GND CS to GND RON to GND Junction Temperature www ...
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Electrical Characteristics for +25°C. (Note 4) Limits appearing in boldface type apply over full Operating Temperature Range. Datasheet min/max A J specification limits are guaranteed by design, test, or statistical analysis. LM3402 Symbol Parameter SYSTEM PARAMETERS ...
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Symbol Parameter I DIM Pull-up Current DIM-PU N-MOSFET AND DRIVER R Buck Switch On Resistance DS-ON V BOOT Under-voltage Lock-out DR-UVLO Threshold V BOOT Under-voltage Lock-out DR-HYS Hysteresis THERMAL SHUTDOWN T Thermal Shutdown Threshold SD T Thermal Shutdown Hysteresis SD-HYS ...
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Typical Performance Characteristics V vs Temperature (V REF LM3402HV (T REF IN Current Limit LM3402 ( 24V) IN 20192129 = 25°C) Current Limit vs Temperature (V A 20192131 = 25°C) Current ...
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100 kΩ 25° LM3402HV 25°C) A www.national.com , IN = 25°C) A 20192135 , IN 20192137 20192138 ...
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LM3402 O-MAX 25°C) A 20192140 LM3402HV O-MAX 25°C) A 20192142 LM3402 O-MIN 25° LM3402HV ...
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Block Diagram Application Information THEORY OF OPERATION 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 ...
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The LM3402/02HV regulators should be operated in contin- uous conduction mode (CCM), where inductor current stays positive throughout the switching cycle. During steady-state operationin the CCM, the converter maintains a constant switching frequency, which can be selected using the follow- ...
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HIGH VOLTAGE BIAS REGULATOR The LM3402/02HV contains an internal linear regulator with a 7V output, connected between the VIN and the VCC pins. The VCC pin should be bypassed to the GND pin with a 0.1 µF ceramic capacitor connected ...
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LOW POWER SHUTDOWN The LM3402/02HV can be switched to a low power state ( µA) by grounding the RON pin with a signal-level SD MOSFET as shown in Figure 3. Low power MOSFETs like the 2N7000, 2N3904, or ...
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Design Considerations SWITCHING FREQUENCY Switching frequency is selected based on the tradeoffs be- tween efficiency (better at low frequency), solution size/cost (smaller at high frequency), and the range of output voltage that can be regulated (wider at lower frequency.) Many ...
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INPUT CAPACITORS Input capacitors at the VIN pin of the LM3402/02HV are se- lected using requirements for minimum capacitance and rms ripple current. The input capacitors supply pulses of current approximately equal to I while the power MOSFET is on, ...
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R and select R the expression relating t ON the Controlled On-time Overview section can be re-written as: Minimum on-time occurs at the maximum V 110% = 26.4V therefore calculated as ...
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For this example the peak current rating of the inductor should be greater than 479 mA. In the case of a short circuit across the LED array, the LM3402 will continue to deliver rated cur- rent through the short but ...
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If possible, a footprint should be used that is capable of accepting both SOD-123 and a larger case size, such as SMA. A larger diode with a higher forward current rating will ...
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SNS average inductor current will equal the desired average LED current of 350 mA yields the target current ripple in the in- ductor and LEDs: Δi = Δi ...
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Schottky diode at 350 mA is approximately 0.65V and the θ is 88°C/W. Power dissipation and temperature rise can be JA calculated as 0.065 x 0. 0.042 4°C RISE ...
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The path be- tween the input source and the input capacitor and the path between the recirculating diode and the LEDs/current sense resistor are examples of continuous current paths. In contrast, the ...
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ID Part Number U1 LM3402 L1 SLF7045T-330MR82 D1 CMHSH5-4 Cf VJ0805Y104KXXAT Cb VJ0805Y103KXXAT Cin C3216X7R1H105M Co C2012X7R1A225M Rsns ERJ6BQFR75V Ron CRCW08055902F ID Part Number U1 LM3402HV L1 DO5022P-684 D1 CMMSH1-100 Cf VJ0805Y104KXXAT Cb VJ0805Y103KXXAT Cin C4532X7R2A225M Rsns ERJ6BQFR56V Ron CRCW08051214F ...
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Physical Dimensions inches (millimeters) unless otherwise noted 8-Lead MSOP Package NS Package Number MUA08A 8-Lead PSOP Package NS Package Number MRA08B 23 www.national.com ...
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