What is the difference between UCC27211 and UCC27211A?

The UCC27210A and UCC27211A Drivers are based on the popular UCC27200 and UCC27201 MOSFET drivers, but offer several significant performance improvements. Peak output pull-up and pull-down current has been increased to 4-A source and 4-A sink, and pull-up and pull-down resistance have been reduced to 0.9 Ω, thereby allowing for driving large power MOSFETs with minimized switching losses during the transition through the MOSFET’s Miller Plateau. The input structure is now able to directly handle -10 VDC, which increases robustness and also allows direct interface to gate-drive transformers without using rectification diodes. The inputs are also independent of supply voltage and have a 20-V maximum rating.

The UCC27210A and UCC27211A’s switching node (HS pin) is able to handle -18 V maximum which allows the high-side channel to be protected from inherent negative voltages caused parasitic inductance and stray capacitance. The UCC27210A (Pseudo-CMOS inputs) and UCC27211A (TTL inputs) have increased hysteresis allowing for interface to analog or digital PWM controllers with enhanced noise immunity.

The low-side and high-side gate drivers are independently controlled and matched to 2 ns between the turn on and turn off of each other.

An on-chip 120-V rated bootstrap diode eliminates the external discrete diodes. Under-voltage lockout is provided for both the high-side and the low-side drivers providing symmetric turn-on/turn-off behavior and forcing the outputs low if the drive voltage is below the specified threshold.

Both devices are offered in 8-pin SOIC (D) and 4-mm x 4-mm SON-8 (DRM).

Kening Gao, thanks for the answer but I do know how to read the datasheet, and what you posted is what I have been reading already and it doesn't mention anything about the difference between UCC27211 and UCC27211A.

By the way, there is no device called UCC27210A, it is mentioned in the datasheet, but it is not found in the TI site, and the link in the datasheet for "Check for samples" is a broken link.

I too would love to know the difference.  All I can tell is that the "Fast Propagation Delay Times" and  "Delay Matching" is worse for the 'A' version part.

Hello Kening, 

I am currently using  the UCC27211 and i cannot find the bootstrap diode leakage current value? Is there something that I miss from the datasheet?? Some more diode curves would be much appreciated. I would expect from TI a very detailed section for the diode because it is very important for the proper design of the bootstrap circuit to understand the diode, as well as to know how much is the series (if there is any, or measured experimentally) bootstrap resistance.

In addition to that, why the datasheet of the UCC27201 has much more tests (circuit diagrams, more detailed PCB layout .etc etc) of the driver compared to the UCC27211?

Finally, the UCC27201  has the Q1 version which is automotive qualified, while the UCC27211Q1 is non-existent.... I am using it for automotive application and I just wonder if I should go for the UCC27201Q1  instead of the UCC27211 (temperature wise they have the same specs though)?? Should I expect an UCC27211Q1 in due time from TI?? is this at the company's plans??

Thank you in advance for your time and effort

Kind Regards 

Dimitris.

Dimitris brings up more great points.  Please People of TI, can we get any comments on this?  I'm seeing some strange behavior occasionally from the bootstrap when starting my pwm.  I would love if someone at TI could comment on what the rational for introducing this part vs the old one.

Thanks,

~Kevin

Hi Kevin,

Can you describe what strange behavior you met?

Regards

I haven't tested it enough to pin the issue down.  Besides, that's not what I'm interested in from this forum posting.  I just wish to have the above questions answered about the two different parts.