In addition to linear dimming, PWM-based dimming (0.38% min. duty) is possible in order to maintain LED current linearity. As a result, high precision control is enabled with minimal power consumption. In addition, multiple protection circuits are built in that protect against LED disconnection, open/short circuits, overcurrent, and overvoltage conditions, ensuring a higher degree of reliability.
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Original REGSPIC technology is used for automatic step-up/-down switching in response to battery voltage fluctuations. Unlike conventional SEPIC systems, no external inductor and capacitor are required, reducing mounting area.
In addition, stable output is ensured - even during boost/buck switching - minimizing image fluctuations, and the unit flexibly responds to changes in the number of LEDs, enabling direct battery connection.
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| A serial-parallel conversion function with 4-line control (clock, data, latch, shutdown) is built in. Standby conditions can be set via the shutdown (SDWN) terminal for reduced energy consumption. In addition, a high voltage resistance output port is integrated that eliminates the need for a high voltage transistor while delivering a drive current of 50mA (max. DC), enabling LED connection on the battery line. Cascade connection is also supported for bit expansion. |
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Localized dimming is enabled for optimized contrast of the video signal, resulting in clear imaging. 10bit (1024-step) PWM dimming makes a wide range of dimming possible with few control lines (3-line serial interface). (BD9202EFS)
Optimized scanning eliminates video blur and reduces power consumption. 72-lamp drive (max.) is possible - ideal for TVs and the like. (BD9203EFV)
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| ROHM's white LED current drivers feature a PWM DC/DC converter and excellent current accuracy. A wide range of brightness control is possible via external PWM input. In addition, the precision current driver minimizes differences between lines, reducing brightness fluctuations, while the compact package contributes to end-product miniaturization. |
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| This step-up DC/DC converter enables constant current drive of up to 8 LEDs in series. Current mode, combined with no current fluctuations during serial connection, results in high-speed transient response for stable white LED driving. Ideal for a variety of applications besides LCD backlighting, such as A/C temperature display. |
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| 2 types of automatic dimming is enabled for 8-lamp serial drive (the most in the industry). Automatic dimming is performed based on the image signal in real time while the other adjusts for ambient conditions. The result is less eye strain and reduced power consumption. In addition, current is adjusted in 246 steps for flicker-free operation. |
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| These 6ch LED drivers feature 16 illumination display patterns, allowing simple control via input signals from a CPU, reducing CPU load. In addition, a charge pump and 7bit gradation current DAC are built in, along with constant current circuits at all 6 channels. LED forward voltage fluctuations are suppressed as well, enabling stable display of over 2 million colors. |
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The BD6062GU driver IC enables large current drive (over 1A) in a CSP (Chip Scale Package), making it ideal for flash LED applications. 2- (serial control mode) or 3-line (register high power control mode) control is possible. An original timer function is included for 3-line control that allows the pre-flash and flash times to be set.The BD7700GU LED flash driver IC is capable of providing a maximum of 300mA (3 channels). Two types of modes are selectable - flash and torch - via external 2-line control. A flash mode timer is also integrated (1s max.), enabling easy configuration of the flash time.
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The charge pump model, offered in an ultra-compact, low-profile chip-scale package, utilizes a 1-wire control system that greatly simplifies wiring layout. Automatic boost switching enbales high efficiency operation while the constant current driver minimizes brightness fluctuations, even in parallel configurations.The chopper type ensures no current variations during serial connection and includes a current mode for high-speed transient response, resulting in stable white LED driving.
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| The BD9207FPS integrates a step-down switching regulator and Pch MOSFET. The low 0.2V feedback voltage minimizes loss through the sense resistor. In addition, the 900KHz PWM drive method supports smaller coils than conventional low-frequency systems. |
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A constant current circuit optimized for driving LEDs is integrated based on conventional low-energy AC/DC converter technology. The BP5843A is the industry's first* to integrate the control circuit, switching element, transformer, and constant current circuit in a compact SIP package.
* ROHM January 2008 survey |
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The BP5845W isolated LED driver is compatible with 80-120VAC input, simplifying power supply configuration. Complete dimming (0-100%) is possible via simple PWM input. 6-9 1W LEDs can be driven serially, while the compact package (46×22.2×18.3mm) contributes to increased space efficiency.
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| Proprietary optical design ensures uniform, diffuse LED-based light distribution similar to natural light. In-house compact, high-efficiency power supplies are also integrated into the lamp section, resulting in the industry's thinnest lighting solution with a thickness of only 38mm. The seamless design was extended to the socket area, enabling continuous, uninterrupted lighting that maximizes the use of space when mounted on ceilings. In addition, the units feature equivalent brightness as a conventional 40W fluorescent lamp but with only half the power consumption. |
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| Multiple low power LEDs, combined with a parabolic reflector, enable broad light distribution. The equivalent brightness of a 60W incandescent bulb is possible using only 7W. The novel configuration minimizes glare while maintaining efficiency, resulting in comfortable, eye-pleasing illumination. |
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| A high thermally conductive copper frame is utilized for superior thermal dissipation characteristics: - 60ºC/W (even when mounted on an FR-4 board (glass epoxy-layered board). The result is the industry's highest brightness in the medium current range (7cd at 100mA). |
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