The one–transistor forward converter is the most elementary form of transformer–isolated buck converter. It is typically used in off–line applications in the 100–300 watt region. This application note illustrates the approach one would take to design a high DC input voltage, one–transistor forward converter.
NJU7660A is a CMOS switched capacitor, voltage converter designed to be an Improved direct replacement of popular 7660/1044.
NJU7660A provides several voltage conversion functions.
The application circuit of negative voltage (VOUT= -VIN) converter requires only two capacitors, and positive twofold voltage(VOUT=2VIN) converter requires two capacitors and two diodes as external components.
Full Compatible with NJU7660
Correspond to MLCC and electrolytic capacitor
Twofold positive Output
Polarity-converted Negative voltage Output
Operating voltage range :+1.5V to +10V(for Negative voltage converter)
:+3.0V to +10V(for Twofold voltage converter)
High-efficiency voltage conversion rate :99.9%(No load, Negative voltage converter)
Few external components :2 capacitors(Negative voltage converter)
:2 capacitors, 2diode(Twofold voltage converter)
Package Outline :DMP8, SSOP8
Part Name(s) :
Description : Low-Voltage ETR Controller with On-Chip DC-DC Converter
SANYO -> Panasonic
Overview The LC72344W and LC72345W are low-voltage electronic tuning microcontrollers that include a DC-DC converter, a PLL that operates up to 230 MHz, a 1/4 duty 1/2 bias LCD driver and other functions on chip. The built-in DC-DC converter provided by these ICs can easily implement a tuning system voltage generator circuit, and furthermore, since the transistor required for the low-pass filter is built in, these ICs can contribute to further end product cost reductions. Additionally, the DC-DC converter output voltage can be provided to other external ICs, making these products optimal for low-voltage portable audio equipment that includes a radio receiver.
Part Name(s) :
Description : Evaluation board Rev.0 for AK4555
Asahi Kasei Microdevices
AKD4555-E is an evaluation board for the portable digital audio 16bit A/D and D/A converter, AK4555. The AKD4555-E can evaluate A/D converter and D/A converter separately in addition to loopback mode (A/D â D/A). The A/D section can be evaluated by interfacing with AKMâs DAC evaluation boards directly. The AKD4555-E has the interface with AKMâs ADC evaluation boards. Therefore, itâs easy to evaluate the D/A section. The AKD4555-E also has the digital audio interface and can achieve the interface with digital audio systems via opt-connector.
â¢ Compatible with 2 types of interface
Â Â - Direct interface with AKMâs A/D & D/A converter evaluation boards
Â Â - DIT/DIR with optical input/output
Part Name(s) :
Description : CMOS Hex Buffer/Converter
CD4010BMS Hex Buffer/Converter may be used as CMOS to TTL or DTL logic-level converter or CMOS high-sink-cur rent driver.
• Non-Inverting Type
• High-Voltage Type (20V Rating)
• 100% Tested for Quiescent Current at 20V
• Maximum Input Current of 1µA at 18V Over Full Package-Temperature Range;
- 100nA at 18V and +25oC
• 5V, 10V and 15V Parametric Ratings
• CMOS To DTL/TTL Hex Converter
• CMOS Current “Sink” or “Source” Driver
• CMOS High-to-Low Logic-Level Converter
• Multiplexer - 1 to 6 or 6 to 1
Part Name(s) :
Description : OPTIMIZING THE ST6 A/D CONVERTER ACCURACY
When using the internal Analog to Digital Converter of the ST62 family and maximum A/D converter accuracy is required, it is desirable to filter out any noise present on the analog input, but also noise present on the ground and VCC supply lines of the MCU as VCC is also the voltage reference of the A/D converter. Good decoupling must be made with capacitors on the analog input and between VCC and ground. It is also recommended to put the MCU in wait state while the conversion is in progress, so as to minimize noise injected into VCC by the operation of the micro-controller itself.
Finally, when enough time is available, it is highly recommended to make several successive A/D conversions and take an average of the results. This is the most effective way to get the most accuracy out of the ST6 family A/D converter.
The following code fragment demonstrates a burst of 256 successive measurements, after which the average is put into the accumulator. The whole routine takes approximately 30 milli seconds with an 8 MHz clock. When less time is available, it is of course possible to reduce the number of conversions: 8, 16 or 32 conversions also give good results, although the most con versions give the best results.