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new products
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PLL Synchronization to External Clock
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EXTVCC LDO Powers Chip from VOUT = 3.3V to 40V
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OPTI-LOOP® or Fixed Internal Compensation
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Input & Output Overvoltage Protection
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Thermally Enhanced (5mm × 6mm) QFN Package
Pricing shown is for budgetary use only and may differ
due to local duties, taxes, fees and exchange rates.
36V, 2A Monolithic Synchronous Step-
Down LED Driver with Silent Switcher
Topology Minimizes EMI Concerns
MILPITAS, CA & NORWOOD, MA – July 11, 2017 –
Analog Devices, Inc., which recently acquired Linear
Technology Corporation, announces the LT3932, a
monolithic, synchronous, step-down DC/DC converter
with internal 36V, 2A power switches and an internal
PWM generator. Its fixed frequency, peak current mode
control accurately regulates current within ±1.5% for
strings of up to 2A LEDs. Its integrated PWM generator
offers a 128:1 dimming ratio. If dimming ratios of up to
5000:1 are required, the LT3932 and an external PWM
generator can accommodate these applications. The
LT3932’s 3.6V to 36V input voltage range is ideal for
a wide variety of applications, including automotive,
industrial and architectural lighting. The combination
of its Silent Switcher® topology and spread spectrum
frequency modulation minimizes EMI concerns. The
LT3932 can drive up to eight 2A white LEDs from a
nominal 32V input, delivering in excess of 50 watts.
The LT3932 can deliver efficiencies of 93% while
switching at 2MHz, eliminating the need for external
heat sinking and offering a tiny, compact solution
footprint. Internal open/short LED protection and fault
indication offers added reliability. The LT3932’s switching
frequency is programmable from 200kHz to 2MHz
or it can be synchronized to an external clock signal.
Combined with a thermally enhanced 4mm x 5mm QFN
package, the LT3932 offers a very compact high power
LED driver solution. Other features include accurate
LED current sense with a monitor output, 99.9% duty
cycle operation and programmable UVLO.
New Ruggedized Capacitor from New
Yorker Electronics is Designed for Long Life in
Harsh Conditions
New Yorker Electronics has released a new ruggedized
capacitor with an extraordinary shelf-life and built for
applications demanding very high-performance under
all operating conditions. The new Cornell Dubilier
Electronics HHT Series of Ruggedized Axial-Lead
Aluminum Electrolytic Capacitors are designed to
endure the rigors of extreme industrial and aerospace
applications.
The HHT is the only axial-lead electrolytic featuring a
glass-to-metal seal to prevent dry out of the capacitor
electrolyte. Shelf life is an extraordinary ten years and
operational rated life is 2,000 hours at rated voltage
and at +175°C. At 150°C and full-rated voltage, HHT
capacitors outperform competitive technologies in a
5,000-hour test with ripple currents of up to 10 Arms.
This level of performance makes the HHT an excellent
match for high-stress applications in military, aerospace,
down-hole and off-road transportation applications. Nine
values are offered, from 470µF to 4,700µF, with ratings
from 16Vdc to 40Vdc.
The CDE HHT Series is the only aluminum electrolytic
capacitor available in the market with +175°C
performance. This is usually the domain of the
considerably more expensive wet tantalum technology.
The reason is the HHT’s glass-to-metal seal. Without
the seal, high temperatures will cause conventional
electrolytics to lose electrolyte over time. This causes
a drop in capacitance and an increase in ESR. With
capacitance stability at high temperature, low leakage
74 l New-Tech Magazine Europe