AN2836 datasheet(8/57 Pages) STMICROELECTRONICS

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Main differences between L6225, L6226, L6227

AN2836

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Doc ID 15084 Rev 1

Main differences between L6225, L6226, L6227

The L6225, L6226 and L6227 are DMOS dual full-bridge ICs.

The L6225 (see Figure 1) includes logic for CMOS/TTL interface, a charge pump that

provides auxiliary voltage to drive the high-side DMOS, non-dissipative overcurrent

protection circuitry on the high-side DMOS, with a fixed trip point set at 2.8 A (see

Section 4.13), overtemperature protection, undervoltage lockout for reliable startup.

In addition, the L6226 (see Figure 2) gives the possibility of adjusting the trip point of the

overcurrent protection for each of the two full bridges (through two external resistors), and

its internal open-drain MOSFETs (see Section 4.13) are not internally connected to EN pins

but to separate OCD pins, allowing easier external diagnostics and overcurrent management.

The L6227 (see Figure 3) has an overcurrent protection function with a fixed trip point set at

2.8 A and internal open-drain MOSFETs connected to EN pins, as the L6225, but it also

integrates two PWM current controllers for each of the two full bridges (see Section 4.11).

Figure 1.

L6225 block diagram

AN2836 Datasheet(PDF) 8 Page - STMicroelectronics