Below are detailed information about the B55 chip:
Technical Specifications
- LED current (IF): set by external resistor, typical value is 80mA
- High Current Accuracy: ±1.5%
- High output power: 3W (LED load @ VOUT=20V, VIN=5V)
- High efficiency: over 80% efficiency with recommended external components and circuitry
- Output overvoltage shutdown: disables switching operation when OVP pin voltage exceeds 32.5V (typical); operation is re-enabled when voltage returns to 31.5V (typical) or below
- Soft-start function: Soft-start function included
- Adjustable switching frequency: 200kHz to 2MHz
- Operating temperature range: -40°C to +85°C
- Storage temperature range: -55°C to +150°C
- Maximum junction temperature: 150°C
- Supply voltage (VIN): -0.3V to +6.0V
- Input Voltage (VIN(EN)): -0.3V to +VIN + 0.3V
- Switch pin voltage (VO (SW)): -0.3V to +48V
- Power Dissipation (PD): 0.36W on device, 0.64W on PCB
- Thermal resistance (Rth (j-a)): 340°C/W on device, 193°C/W on PCB
Functional Features
- Variable LED current: Set LED current via external resistor, 80mA typical
- High efficiency: over 80% efficiency with recommended external components and circuitry
- Overvoltage protection: protects the circuit by shutting down switching operation when the OVP pin voltage exceeds 32.5V (typical)
- Soft-start function: reduces current inrush during startup and protects circuitry
- Adjustable switching frequency: Allows switching frequency to be adjusted from 200kHz to 2MHz to optimize circuit performance and efficiency
- Small package size: SON8 package measuring 3mm x 3mm for space-constrained applications
Application Areas
- LCD Backlight: LCD backlight drivers for PDAs, cell phones, portable terminal devices, etc.
- Portable Devices: For a variety of portable electronic devices that require efficient, small footprint LED driver solutions
Cautions
- Compatibility: Before purchasing, please make sure the chip is compatible with your application.
- Installation Instructions:
- Make sure the chip is mounted in the correct direction and the pins are aligned with the pads on the board.
- During soldering, pay attention to temperature control to avoid overheating and damaging the chip.
- Take appropriate static protection measures to avoid static electricity damage to the chip.
- Technical Support: If further technical support is required, it is recommended to contact the supplier or manufacturer.
Summary
B55 is a high efficiency step-up DC/DC converter manufactured by Toshiba Semiconductor and designed for white LED constant current drive. Its high efficiency, small size, and multiple protection features make it an excellent performer in portable devices and LCD backlight applications.
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