MA5332MS datasheet(44/60 Pages) INFINEON

44 / 60 page

Datasheet

44 of 59

V 2.0

9/24/2021

Integrated Class D Amplifier

MA5332MS

Protections

11.2

Over Current Protection (OCP)

The MA5332MS features over current protection to protect the internal power MOSFETs during abnormal load

conditions. The control logic diagrams are in Figure 41. As soon as either the high-side or low-side current sensing

block detects over current, the following sequence will occur.

1. The shutdown latch flips its logic states from normal operational mode to shutdown mode.

2. Low-side and high-side MOSFETs go into an off state condition.

3. The CSD pin starts discharging the external capacitor Ct.

4. When voltage across Ct falls below the lower threshold Vth2, COMP2 resets the shutdown latch to normal

mode.

5. The CSD pin starts charging the external capacitor Ct.

6. When VCSD goes above the upper threshold Vth1, the logic on COMP1 toggles and the IC resumes

operation.

Figure 41 summarizes the above. As long as the over current condition exists, the IC will repeat the over current

protection sequence at a repetitive rate set by the CSD capacitor.

Figure 41 Overcurrent Protection Timing Chart

MA5332MS Datasheet(PDF) 44 Page - Infineon Technologies AG