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Micrel HDTV tuner applications released for the latest thin boost regulator
Marketwire2010 was June 3, SAN JOSE, Calif. -
Analog, high bandwidth communications and Ethernet IC (IC) solutions, the industry leader in Micrel Semiconductor (MicrelInc.) (NASDAQ: MCRL) today announced an integrated switch boost chip MIC2619, the chips in 1.2MHz, can provide up to 350mA switch current. MIC2619 has programmable overvoltage protection (OVP), very low shutdown current and soft start. The device expands Micrel s MIC2601 / 2 and MIC2605 / 6 step-up converters for digital TV tuner, optical network equipment, LCD bias supplies, SEPIC converters and positive output boost regulator applications. The device is currently available in volume quantities, the order of 1K starting price $ 0.40. Micrel Semiconductor is currently available through the website order samples.
Micrel s director of marketing DoyleSlack simulation, said: “Micrel s new with programmable overvoltage protection integrated switch boost regulator for driving the current HDTV tuner chip PWM switching frequency and high-low-profile package reduces the LCD, LED and 3D high-definition TV design cost. “
MIC2619 has a 35V output voltage and higher than the maximum switching current of 350mA, can easily drive the majority of TV tuners and other high-bias applications. MIC2619 uses 1.2MHz constant frequency current mode PWM control scheme. High-frequency pulse-width modulation work can be reduced external component size, saving board space. And frequency control solutions, the constant frequency PWM control scheme has a low output ripple and the power of the reflective input ripple is small. MIC2619 has programmable overvoltage protection, ensuring the implementation of the output protection under fault conditions.
MIC2619 uses mini-pin Thin SOT-236 package, junction temperature range is -40 to +125 degrees Celsius.
Adjust the regulator on tractor technology
1, the closure device adjustments. First, adjust the contact gap of 0.7 when separated – 0.9 mm. Remove the regulator terminal on the battery and the wire armature, and then firing at the armature terminal on the battery touch the fire, use battery power to absorb the activities of rallying action interceptors. In the touch of fire, relax interceptors spring, so that the magnetization of the core activities of rallying will suck, and then tighten the spring while hitting the edge of the fire until it just can not suck up to the next rallying, indicating that the closure spring is suitable for 12V voltage, then empirically adjusted spring, closed slightly higher voltage. Closed voltage adjust, it will remove the battery, the armature wiring connected, start the engine test. Idle micro-ammeter pointer offset to the discharge direction, and then improve the speed of the current pointer to the direction of charge, when the slow speed to a lower value, the ammeter pointer back to zero discharge and speed, the ammeter pointer when the maximum value of reverse swing is the counter-current value, its value should meet the requirements.
2, the limiter adjustment. Discharge the battery in a semi-state (if sufficient save electricity, electric starter can start the generator 2 – 3 times), stuffed with a wood core and booster activities rallying between the regulator contacts are closed , loss of regulator role. Then the engine speed increases to medium speed, then the current value of the ammeter pointer to the specified value should be 3 / 4. To continue to increase speed, while the ammeter indicates the current value is no longer increasing, and the limiter contacts between the weak spark, should be considered normal.
3, the regulator adjustment. Stuffed with wood chips in the current limiter and the core activities of rallying between the limiter contact closure, the generator running at medium speed, change the spring tension and adjust the generator terminal voltage. If more battery power loss, the ammeter indicates at 12A or so (loss of electricity charge value). If the battery charge than the full, the ammeter indicates 8A or so, the generator terminal voltage close to the standard value.