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The UVLO function causes the output to be clamped whenever there is insufficient power supply voltage for safe operation. The under- voltage lockout protection circuitry ensures that there is sufficient gate drive voltage to switch the IGBTs completely on, therefore minimizing IGBT power dissipation. Once the supply voltage exceeds the positive-going UVLO threshold, the UVLO clamp is released, allowing the device output to turn on in response to an input signal.
Efficiency has been a key design goal of the new ACPL-H342 and ACPL-K342 gate drives. Their rail-to-rail output voltage swing and the low output dead time, made possible by low propagation time, minimize driver dissipation and increase efficiency.
Propagation delay is specified to prevent cross conduction of the IGBTs in the high- and low-side half-bridge IGBT configuration that is commonly used in power inverters. Propagation delay difference (tphl - tplh) between two devices is -10 ns minimum to -200 ns maximum. Hence, shoot through is prevented, thus eliminating a major condition that can cause IGBT damage and shorten operating life.
The ACPL-H342 and ACPL-K342 gate driver key features include
* Built-in IGBT protection
o Active Miller clamp o UVLO with hysteresis
o No cross conduction between parts: tphl - tplh
* 15 to 30 V supply voltage operation with rail-to- rail output drive
* High maximum working insulation voltage per IEC/EN/DIN EN 60747-5-5
o ACPL-H342-x60: 891 Vpeak o ACPL-K342-x60: 1140 Vpeak
* High momentary withstand voltage per UL 1577 164
www.compoundsemiconductor.net August/September 2010
o ACPL-H342: 3750 Vrms for 1 minute o ACPL-K342: 5000 Vrms for 1 minute
* High common-mode transient immunity: 40 kV/ µs at 1.5 kV common mode voltage
* Fast propagation delay reduces dead time and increases system efficiency
* 8-lead SSO-8 package (stretched SO-8) is 40% smaller than 8-pin DIP
Devices are available in RoHS compliant, 8-lead stretched SO-8 packages that are 40% smaller than conventional 8-pin DIP packages. All devices operate over a very wide temperature range of -40 to +105° C.
Avago’s ACPL-H342-000E is priced at $1.45 each in 10,000 piece quantities and the ACPL-K342- 000E is priced at $1.60 each in 10,000 pieces.
Samples and production quantities are available now through Avago’s direct sales channel and worldwide distribution partners.
Cree’s LEDs Are Industry’s Most Color- Consistent
The firm’s EasyWhite binning feature enables customers to specify a color temperature and lumen output, simplifying LED system design and improving LED-to-LED color consistency
Cree, a market leader in LED lighting, is taking another leadership position in the LED industry with the addition of the industry’s smallest warm and neutral bins to its award-winning multichip XLamp MP-L and MC-E EasyWhite LEDs.
This breakthrough offers a single two-step MacAdams ellipse bin per color temperature, optimized to achieve incandescent-like color consistency and eliminating the need to purchase multiple small bins and perform complex color mixing.
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