Pi40952 3x2b Driver -

Educational Paper: pi40952 3x2b Driver

Issue 4: Overheating at Only 1A Load

• Cause: High RDS(on) due to insufficient gate drive voltage.
• Check: VLOGIC (if separate) may be below the minimum 3V. Some variants require 5V logic for minimum resistance.

Example 1: Basic DC Motor Control (Channel A)

// Define pins for PI40952 Channel A
#define A1 2  // IA1 (Bit 1)
#define A2 3  // IA2 (Bit 2)
#define EN  4  // Master enable
void setup() 
pinMode(A1, OUTPUT);
pinMode(A2, OUTPUT);
pinMode(EN, OUTPUT);
digitalWrite(EN, HIGH); // Enable driver

void motorStop() 
digitalWrite(A1, LOW);
digitalWrite(A2, LOW); // Coast mode
 pi40952 3x2b driver
void motorForward() 
digitalWrite(A1, LOW);
digitalWrite(A2, HIGH);
 Educational Paper: pi40952 3x2b Driver Issue 4: Overheating
void motorReverse() 
digitalWrite(A1, HIGH);
digitalWrite(A2, LOW);
 Cause:  High RDS(on) due to insufficient gate drive voltage
void motorBrake() 
digitalWrite(A1, HIGH);
digitalWrite(A2, HIGH);

void loop() 
motorForward();
delay(2000);
motorBrake();
delay(1000);
motorReverse();
delay(2000);
motorStop();
delay(1000);

Recommended PCB Stackup (4-layer)

• Top: Signal routing (logic inputs, sense lines)
• Inner 1: GND plane
• Inner 2: VBB power plane
• Bottom: Secondary traces, heatsinking

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