The high-current P/N-channel half-bridge BTN8962 and BTN8982 are acceptable for automotive, industrial, robotic, home and medical applications, with voltages of up to 40V. Compared to the antecedent BTN79xx series, Infineon has decidedly bigger a accomplished ambit of abstruse features, with the switching time actuality about bisected and the RDSon in the aerial ancillary (HS) and low ancillary (LS) buses accepting been optimised by 50%. Furthermore, the accepted limiter is 22% bigger in the HS bus and 50% bigger in the LS bus than the antecedent series. As a result, these modules ensure the allowances of a bunched architecture with dent drivers are accessible to applications beyond 250W, after the charge for added cooling. The aerial akin of affiliation of the apparatus encompasses overcurrent and overheat aegis as able-bodied as an undervoltage absolute mechanism. This agency beneath architecture assignment and accordingly lower arrangement costs, which enables developers to optimise their applications. The D2PAK (TO263-7) apartment and pin-out accept remained the same, ensuring that the NovalithIC articles are brand and pin-compatible with the absolute series.
Turning bristles into two – dent apparatus for space-critical applicationsThe centralized three-chip anatomy encompasses a half-bridge driver, an n-channel and a p-channel MOSFET in a chip-by-chip and chip-on-chip design. This band-aid creates best achievement with minimum space. This ambit differs from the BTN79xx alternation by appliance the best a MOSFET technology for n and p-channels.
In an accustomed H-bridge appliance for authoritative a bi-directional brushed DC motor (BDC), this would accredit bristles chips – the half-bridge disciplinarian and four MOSFETs – to be replaced by two NovalithICs, extenuative a cogent bulk of accumulation assignment and space.
Minimal abject furnishings = minimum architecture effortParasitic arising in the articulation is a key botheration in authoritative awful activating systems such as PWM-controlled DC besom motors. A analytical point is the bulge amid the high-side and low-side MOSFETS arch to the motor. Because wire lengths are not a affair in the NovalithIC range, the voltage peaks are bristles times beneath than in detached solutions beneath commensurable conditions. For developers, this agency easier ambit architecture forth with accumulation in the acquiescent apparatus or diodes bare in detached ambit architecture to abate the abrogating voltage peaks.
Everything on lath – analytic tools, careful functions and controlThe analytic functionality of the NovalithIC ambit enables accepted measurements. After added measures, this has a attention of added than ±28%. Simple end-of-line arrangement enables attention to ability ±10%, and with added measures such as temperature compensation, it can accomplish ±3%.
To ascertain overcurrent scenarios, the NovalithIC ambit uses a abstracted centralized accepted altitude action that gauges the accepted abounding through the HS and in the LS switch. If an anterior bulk is triggered by the IC, this overcurrent apprehension action will absolute the accepted by briefly shutting off the afflicted switch. The user receives a authentic accompaniment at the IS cachet pin, and this can be apprehend in the MCU, convalescent the circuit’s performance. In a motor, for example, shut-offs, which are acquired by arrangement factors, can accomplish a aerial bulk of about-face arising current. This can either be bargain by abacus an added ambit or designing the ambit to bear aerial loads. Both methods, however, are circuitous and acquire added expense. The NovalithIC, on the added hand, banned the accepted to the pre-defined amount and controls aggregate automatically.
Time diagram of accepted limiter (inductive load)
A temperature sensor is placed on the argumentation chip, anon on the p-channel MOSFET, to accommodate aegis adjoin overheating. While a detached ambit with alien MOSFETs could ahead alone almost appraisal the temperature, the dent architecture of the NovalithIC allows abstracts to be performed anon on the object.
The dent undervoltage aegis prevents the affiliated motor from affective uncontrollably. The NovalithIC is adequate adjoin abbreviate circuits by a aggregate of accepted limiter and overheating protection, accouterment aegis adjoin short-to-ground or short-to-power, as able-bodied as shorting of the load.
The simple ascendancy apparatus is addition of the NovalithIC’s advantages. With a half-bridge architecture with alien MOSFETs, the user has to ensure that there can be no abbreviate circuits, cantankerous accepted or ‘shoot-through’ accepted back the MOSFETs are connected. With the NovalithIC, however, switching a analytic pin for the disciplinarian ambit is all it takes to handle the switching of the MOSFETs.
Motor ascendancy with dent anatomic securityAll NovalithIC chips accommodated the AECQ-100 accepted and accomplish in temperatures alignment up to 150°C, authoritative them acceptable for automotive applications, including motor designs with DC or besom motors (unidirectional and bidirectional), three-phase brushless motors, heating and air conditioning fans, sunroof controllers and electrically adjustable seats. Because the ICs can accomplish up to 40V, they can additionally be acclimated in automated applications such as white appurtenances and tools.
The Infineon ICs additionally offers a account for safety-critical applications when, for example, two ICs are deployed in an H-bridge architecture for bidirectional control. Such designs automatically action back-up in the ambassador argumentation – as every NovalithIC has its own ascendancy chip, the developer can stop the motor appliance the added IC if one IC fails. With a detached design, in which aloof one H-bridge disciplinarian controls the four MOSFETs, this would aftereffect in complete accident of control, unless measures are taken to anticipate this.
Arduino absorber for the accumulation marketInfineon sees abundant abeyant for the NovalithIC ambit in the accumulation bazaar and archive administration market. This is why the architect has developed a DC motor ascendancy absorber with two BTN8982s that is accordant with the Arduino. It is aimed at any ascendancy arrangement for besom DC motors with a bidirectional or two unidirectional motors with up to 250W in motor output. The NovalithIC can drive up to 55A, but due to thermal restrictions consistent from the admeasurement of the absorber and the layout, it is not recommended to use the absorber for abiding operation at added than 250W. The architecture of the absorber includes about-face polarity protection, implemented by a MOSFET positioned in the circuit.
Author profile: Mathias Müller is all-around artefact sales manager, ability management, and affiliate of the automotive business assemblage at Rutronik.
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