Automotive HVAC Solution

Application

Description

AEC-Q100 certified motor control solution for automotive HVAC systems including blowers, blend doors, and mode actuators with LIN communication.

Core Advantages

High Integration MCU, gate driver, LIN PHY, and LDO integrated in single chip reduces BOM and PCB size
Automotive Qualified AEC-Q100 Grade 1 certification with complete PPAP documentation for OEM requirements
LIN Communication Integrated LIN PHY with auto-addressing simplifies multi-actuator systems
Low Power Sleep mode with <100uA current consumption extends battery life

Recommended Bill of Materials (BOM)

Item Part Number Description Quantity Datasheet
1 LKS32AT037PXL5M6Q9 Automotive MCU with LIN and driver 1 📄 Download
2 BUK9Y25-40E 40V automotive MOSFET 4 📄 Download
3 LKS_PMIC_5V_500 5V LDO (if external needed) 1 📄 Download

Applications

HVAC blower motors
Blend door actuators
Mode door actuators
Recirculation actuators
Active grille shutters

Technical Specifications

Topology
H-bridge or 3-phase
Driver
Integrated 4-phase or 6N
L I N
Integrated PHY with auto-addressing
Control
PWM speed or position control
Diagnostics
Stall detection, overcurrent, open load
Protection
UVLO, OTP, short circuit
Sleep Current
<100uA

Customer Success Stories

Automotive Tier-1 Supplier

Automotive | HVAC Actuator Module

Challenge

Design HVAC blend door actuator for major OEM requiring AEC-Q100 Grade 1, LIN communication, low cost, and small size for door module integration.

Solution

Used LKS32AT037 with integrated LIN PHY and 4-phase driver. Implemented position control with stall detection. Optimized PCB for minimal size.

Results

Passed AEC-Q100 Grade 1 qualification. LIN auto-addressing worked flawlessly with 8 actuators on same bus. PCB size reduced 40% vs previous discrete solution. In production for 3 vehicle programs.

FAE Expert Insights

R

Robert Liu

Automotive FAE Engineer

15 years

Professional Insights

[Data Pending] FAE insights to be added based on actual application experience with this solution.

Key Takeaways

  • Use LKS32AT037 for integrated LIN and driver
  • Auto-addressing simplifies multi-actuator production
  • Implement stall detection for position actuators
  • Design for low sleep mode current

Decision Framework

Decision Framework
Steps:
  1. Evaluate requirements
  2. Compare solutions
  3. Consult FAE

Ready to Implement This Solution?

Contact our FAE team for design support and quotes

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Frequently Asked Questions

How does LIN auto-addressing work in multi-actuator systems?

LIN auto-addressing operation: (1) Normal mode - each actuator has unique address for individual control

(2) Assignment mode - special command puts system in address assignment mode

(3) Sequential assignment - master assigns addresses one by one by activating each actuator

(4) Storage - addresses stored in non-volatile memory

(5) Production benefit - all actuators use same hardware and firmware, addresses assigned during vehicle assembly. This eliminates need for different part numbers for each position. The LKS32AT037 hardware supports auto-addressing with minimal software overhead. Implementation requires only a single GPIO for position detection during assignment.

Use auto-addressing for systems with multiple identical actuators. Simplifies production and reduces part numbers.

What EMC considerations are important for automotive motor control?

Automotive EMC design considerations: (1) Conducted emissions - motor switching creates noise on power lines, requires filtering

(2) Radiated emissions - PWM switching and fast edges radiate EMI, needs proper PCB layout

(3) ESD - automotive requires high ESD immunity (15kV air discharge), protection circuits needed

(4) Transients - load dump, jump start, reverse polarity protection required

(5) CISPR 25 - radiated and conducted emissions must meet automotive limits. Design practices: (1) Input filtering - common mode choke and capacitors on power input

(2) PCB layout - minimize switching loops, proper grounding

(3) Shielding - may be needed for high-power motor drives

(4) Protection - TVS diodes, filtering for ESD and transients. LKS32AT series has high ESD immunity and automotive-qualified EMC performance.

Follow automotive EMC design practices. Add input filtering. Validate with CISPR 25 testing.