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MPQ7200 DRL-PL-TI Lamp Reference Design

Synchronous Buck-Boost Mode LED Driver for Automotive Systems

REFERENCE DESIGN

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1 Overview

1.1 Description

This reference design proposes a dual-channel buck-boost system for daytime running lamp (DRL), position lamp (PL), and turn indicator (TI) applications using the MPQ7200-AEC1. The MPQ7200-AEC1 is a high-frequency, constant-current LED driver with integrated power MOSFETs. The device offers a compact solution to achieve 1.2A of continuous output current (IOUT) across a wide input supply range, with excellent load and line regulation.

The EVQ7200-DRL-PL-TI-00A is a fully assembled and tested buck-boost mode LED driver reference design board. It has two buck-boost channels and generates an LED current up to 1A from a 6V to 20V input range.

1.2 Features

  • Wide 6V to 42V Operating Input Range
  • Buck-Boost Mode: Configurable 1.2A Continuous Output Current (IOUT)
  • 44mΩ/40mΩ Internal Power MOSFETs
  • Default 1.15MHz Switching Frequency (fSW) for Buck-Boost Mode with Spread Spectrum Meets CISPR25 Class 5
  • PWM Dimming (100Hz to 2kHz Dimming Frequency)
  • Internal, 500Hz Two-Step Dimming with Configurable Duty Cycle
  • Fault Indication for LED Short (to GND and Battery), LED Open, Output Over-Voltage (OV) and Thermal Shutdown Conditions
  • Over-Current Protection (OCP)
  • Configurable Thermal Derating via NTC Remote Temperature Sensing
  • EMI Reduction
  • Available in a QFN-19 (3mmx4mm) Package with Wettable Flanks
  • Available in AEC-Q100 Grade 1

Figure 1: EVQ7200-DRL-PL-TI-00A

1.3 Applications

  • Daytime Running Lights (DRLs)
  • Position Lights (PLs)
  • Turn Indicator Lights (TIs)

2 Reference Design

2.1 Block Diagram

The reference design offers a dual-channel buck-boost LED driver solution. It uses 2 LED drivers (MPQ7200-AEC1) to drive DRL-PL-TI lamps (see Figure 2).

Figure 2: Buck-Boost Topology

2.2 Related Solutions

This reference design is based on the following MPS solutions:

Table 1: Related Solutions

MPS Integrated Circuits Description
MPQ7200-AEC1 42V, 1.2A buck-boost or 3A buck, synchronous LED driver, AEC-Q100 qualified


2.3 System Specifications

Table 2: System Specifications

Parameter Specifications
Input voltage (VIN) range 6VDC to 20VDC
Output LEDs 4 LEDs and 3 LEDs
Output current (IOUT) 1A


3 Design

3.1 Schematic

Figure 3: Reference Design Board Schematic


3.2 BOM

Qty Ref Value Description Package Manufacturer Manufacturer PN
2 C1, C2 1µF Ceramic capacitor, 100V, X7S 0805 TDK C2012X7S2A105KT000N
5 C3, C5, C115, C117, C215, C217 1nF Ceramic capacitor, 50V, X7R 0603 Murata GRM188R71H102KA01D
2 C4, C6 22nF Ceramic capacitor, 50V, X7R 0603 Murata GCM188R71H223KA37D
2 C7, C8 10µF Ceramic capacitor, 50V, X7R 1210 Murata GRM32ER71H106KA12L
1 C9 47µF Electrolytic capacitor, 50V SMD Panasonic EEEFN1H470XP
4 C10, C11, C12, C13 NS Ceramic capacitor, 50V, X7R 0603
1 C14 NS Ceramic capacitor, 50V, X5R 1206
1 C15, C109, C110, C209, C210 NS Ceramic capacitor, 50V, X5R 0805
4 C101, C103, C201, C203 4.7µF Ceramic capacitor, 50V, X7R 1206 Murata GRM31CR71H475KA12L
2 C113,C213 22nF Ceramic capacitor, 50V, X7R 0402 Murata GCM155R71H223JA
10 C102, C104, C106, C108, C111,C202, C204, C206, C208, C211 100nF Ceramic capacitor, 50V, X7R 0603 Murata GCJ188R71H104KA12D
4 C105, C107, C205, C207 470nF Ceramic capacitor, 100V, X7R 0805 Murata GRM21BR72A474KA73L
2 C112, C212 10µF Ceramic capacitor, 16V, X7S 0805 Murata GRM21BC71C106KE11L
2 C114, C116, C214, C216 4.7µF Ceramic capacitor, 25V, X7R 1210 TDK C3225X7R1E475M
1 C118, C218 100nF Ceramic capacitor, 25V, X7R 0603 Murata GCJ188R71E104KA12D
1 D1 36V TVS, 36V DO-214AC Bournes SMAJ36CA-Q
1 D2 60V Diode, 60V, 5A SMC Diodes B560C-13-F
2 D101, D201 60V Diode, 60V, 3A SMA Diodes B360A-13-F
3 FB1, FB2, FB3 6A Magnetic bead, 6A 1206 Murata BLM31PG330SH1L
2 FB101, FB201 Short Film resistor, 1% 0805 Yageo RC0805FR-070RL
1 L1 Short Film resistor, 1% 0805 Yageo RC0805FR-070RL
1 L2 4.7µH Inductor, 4.7ΩH, 36mΩ, 5.9A SMD Coilcraft XAL5030-472MEB
1 L3 NS Inductor SMD
1 L101, L201 4.7µH Inductor, 4.7µH, 44.1mΩ, 5.1A SMD Coilcraft XEL4030-472MEB
1 M1 NS N-channel MOSFET SO-8
1 R1 NS Film resistor 1206
1 R2 NS Film resistor, 5% 0603
3 R3, R4, R6 NS Film resistor, 5% 0603
1 R5 NS Film resistor, 5% 0603
3 R101, R201 100kΩ Film resistor, 1% 0603 Yageo RC0603FR-07100KL
2 R102, R202 0Ω Film resistor, 1% 0603 Yageo RC0603FR-070RL
2 R103, R203 4.87kΩ Film resistor, 1% 0603 Yageo RC0603FR-074K87L
2 R102, R204 10kΩ Film resistor, 1% 0603 Murata RC0603FR-0710KL
2 R105, R205 16kΩ Film resistor, 1% 0603 Yageo RC0603FR-0716KL
2 R106, R206 2.32kΩ Film resistor, 1% 0603 Yageo RC0603FR-072K32L
1 R107, R207 100kΩ Film resistor, 1% 0402 Yageo RC0402FR-07100KL
2 R108, R208 20Ω Film resistor, 1% 0402 Yageo RC0402FR-0720RL
2 R109, R209 15kΩ Film resistor, 1% 0402 Yageo RC0402FR-0715KL
2 GND, Vin, LED1+, LED1-, LED2+, LED2- 2mm Golden pin DIP Custom Any
2 FB102, FB202 MPL-AT2010-R47 Inductor, 470nH, 27mΩ, 4.4A SMD MPS MPL-AT2010-R47
2 U1, U2 MPQ7200-AEC1 Synchronous LED driver QFN-19 (3mmx4mm) MPS MPQ7200GLE-AEC1
1 U3 MPQ5850 (optional) Smart diode controller, 36V TSOT23-8 (2mmx3mm) MPS MPQ5850GJ-AEC1

3.3 PCB Layout



4 Test Results

4.1 Efficiency

Buck-boost mode, L = 4.7µH, ILED = 1A, fSW = 1.15MHz, channel 1: 4 LEDs (VLED1 = 12V), channel 2: 3 LEDs (VLED2 = 9V), TA = 25°C, unless otherwise noted.