1, can be suitable for USB power supply and adapter power supply work. The thermal feedback automatically adjusts the charging current to limit the chip temperature in high-power operation or high ambient temperature conditions F. The charging voltage is fixed at 4V, while the charging current can be set externally via a resistor.
2, V to 8V can use TI's TPS61040 (maximum lossOutput current 400mA) or TPS61041 (maximum output current 250mA), input voltage 8V~6V, output voltage minimum equal to the input voltage, maximum 28V, packaged as SOT-23 (5-pin).
3. Use mc34063 as the core to design a booster circuit to convert 12V to 24V. Input 12V voltage to the V of mc34063, plus the filter capacitor, and the input end composed of R6, R8 op-amp module. The NPN tube makes the circuit on-off function, and the output end is the chopper circuit design to achieve the effect of boosting voltage.
4,According to this simple circuit diagram can be made. The principle is that the transistor self-excited oscillation, transformer boost voltage.
Small power is mainly the power tube integrated buck-boost chip, used in mobile phones and wearable products as a pre-regulator. High power is generally external power tube, also divided into synchronous and asynchronous control. Synchronization is usually more efficient than asynchronous.
A good B.
v voltage reference chip is not common, only 5v reference can be used. The 5v reference requires an input voltage above 50.8v, so you have to prepare 6v voltage specifically for the 5v reference, which brings trouble. If the input can be limited to 096v or 5v, the reference source of these two levels is selected, and the 5v voltage is available.
Reference voltage source. According to the information of the Electronic Enthusiast.com, precision analog designers often rely on quiet and unimpressive reference voltage sources to power their DAC and ADC converters, all analog-to-digital converters (ADCs) and digital-to-analog converters (DA)C) A reference voltage (usually a voltage) is required.
When the reference voltage is 3V, 3V/65535, at this time, a digital quantity indicates that the voltage is about 0.045mv. When the reference voltage is 5V, 5V/65535, at this time, a digital quantity represents a voltage of about 0.076mv. See your maximum input voltage is how much, choose and reference voltage close, the conversion accuracy is higher.
1, current setting foot. GB98AERN is the patch 16 pin, GB98ADN is the direct insertion 16 pin, the principle is the current setting foot, the direct insertion chip 2 pin is the current setting foot, both increase the ground resistance value and reduce the lamp current.
2, gb98aern chip backlight circuit principle is the driver. The GB98ADN is an efficient, high-power LED drive controller that provides drivers for MOSFET boost converters. It can drive four LED lights with a rated current of 250mA. It supports pulses up to 400 mA.
3, remove the transformer for replacement. Remove the transformer and increase the OL, P pin voltage of the backlight control IC to more than 2 volts. But this is relatively more professional knowledge, it is recommended to get the repair shop for repair, in fact, it is relatively simple, just replace an electronic component.
4. The main fuse is burned out. The backlight of gb98aern is not bright because the main fuse is burned out. Should be the first time to find a professional to repair, otherwise it will bring no small damage to the TV.