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Synchronization

From Beta Dyne Inc.
 

 
In systems where more than one converter is required, synchronization should be used if it is available. It can reduce cost, space and conducted and radiated noise (EMI/RFI). A single low-pass filter will reduce cost and space when all converters operate at the same frequency. This also eliminates multi-frequency harmonics and subharmonics from the power bus (see Figures 6A & 6B for oscillograms of reflected ripple with and without synchronization). The design of the 15W series is based on a current mode PWM in a forward topology configuration. The oscillation frequency is set by a RT-CT network as is shown in Figures 1 and 2. The timing capacitor is connected to input power ground through a series resistor R ˜ 100O and the common point (node) of R-CT is used for synchronization of multiple converters of the same input voltage range. There are three methods to synchronize the 15W series converters: 1) single wire, 2) capacitor coupling to external clock, and 3) direct drive of the SYNC input by an open drain MOSFET.
Products & Services
DC-DC converter chips provide a regulated DC voltage output from a different, unregulated input voltage.  Search by Specification | Learn more about DC-DC Converter Chips
Network synchronization products are used to maintain and synchronize the timing among all the elements of a network. Learn more about Network Synchronization Products
Signal converters contain inputs for one type of signal and outputs of another. Features can also include filtering and amplification or attenuation. Search by Specification | Learn more about Signal Converters
Voltage-to-frequency converters accept a voltage signal and convert its analog level to a signal with a corresponding frequency. Search by Specification | Learn more about Voltage-to-Frequency Converters
Power frequency converters take electrical input power at one frequency and voltage and provide electrical output power at a different frequency and at a different or equal voltage. Search by Specification | Learn more about Power Frequency Converters
Product Announcements
UltraVolt, Inc. - "E" Series Precision High Voltage Power Supplies
The "E" Series of high-voltage, regulated DC-DC converters addresses the needs of the precision high-voltage-power supply user. The "E" Series is designed and built utilizing state-of-the-art power... (read more)
UltraVolt, Inc. - "C" Series High Voltage Power Supply
The "C" Series of high-voltage regulated DC-DC converters are designed for fast-rise-time/charging applications utilizing state-of-the-art power conversion topology. Surface mount technology and... (read more)
UltraVolt, Inc. - “AA” Series HV Power Supply for PCB Mounting
The "AA" Series of high-voltage regulated DC-DC converters addresses the needs of the miniature PCB-mount regulated high voltage power supply user. Designed and built utilizing state of the art power... (read more)
UltraVolt, Inc. - "A" Series High Voltage Power Supply
The "A" Series of high-voltage regulated DC-DC high-voltage power supplies address the needs of the miniature PCB-mount, regulated high-voltage-power-supply user. Designed and built utilizing state of... (read more)
Advanced Power Electronics Corp. USA - APU3146O-3 PWM Buck Controller
This is a driver IC for point-of-load buck converters. Typical applications include dual phase ASIC and DDR memory power management circuits, datacom, telecommunications, and PC Power related power... (read more)
UltraVolt, Inc. - "FIL" Series Non-Isolated Filament Supply
The "FIL" Series is a non-isolated precision filament supply. This line of regulated DC-DC converters addresses the needs of the high precision and high stability power supply user. Designed and built... (read more)
Topics of Interest
During the conversion process, all DC/DC converters generate unwanted high frequency noise. Over the years designers have used different designs and topologies to minimize and/or eliminate the noise... (Read More)
13.1 Introduction As newer integrated circuits lead to more electronic functions in smaller packages, it becomes essential for power supplies also to become smaller. The power supplies mainly get... (Read More)
Today the majority of mobile phones use white LEDs to provide backlighting for the color display. Nearly every phone designer strives to drive the backlight with the most efficient, smallest size, and... (Read More)
OVERVIEW So far, we have derived equivalent circuit models for dc-dc pulse-width modulation (PWM) converters operating in the continuous conduction mode. As illustrated in Fig. 11.1, the basic dc... (Read More)
As they operate, digital circuits constantly switch the state of lines between a high-voltage level and a low-voltage level to represent binary states. As shown in Figure 4.1a, the resulting... (Read More)
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