33 series of H-bridge Driver LSIs with industry's first high-efficiency DC input PWM technology

ROHM has recently completed development 33 series of H-bridge driver LSIs for brush-commutated motors featuring low power consumption for high-efficiency motor driving. They are ideally suited for a wide variety of applications, including audiovisual (AV) equipment, PC peripheral devices, office (OA) equipment, and home electrical appliances. Mass production of the BD6221F was implemented in October 2006 in response to increasing demand for AV equipment and PC peripheral devices. High volume production of other models is scheduled to follow. ROHM is currently establishing a system that will eventually reach the output rate of one million units per month. ROHM Hamamatsu Co., Ltd. is in charge of the primary stage of production while ROHM Integrated Systems (Thailand) Co., Ltd. will be responsible for the second phase.

Brush-commutated motors are used in a wide range of applications, such as AV equipment – including DVD recorders and video cameras – OA equipment, and home electrical appliances (i.e. refrigerators), and the number of applications is continually increasing. Changing the product design through modification of motor specifications or control functions is often time consuming and imposes a heavy burden during the development stage. ROHM’s new H-bridge driver LSI series incorporates a new V^_REF variable system for driving brush-commutated motors with low power consumption without changing the input voltage level. This simplifies replacement while providing optimum motor drive operation with minimal design changes. This whole series of H-bridge drivers support a wide range of supply voltage (3V to 36V) and output current (up to 2A). And also they can achieve lowering circuit current under no load down to 1/10~1/20 compared to conventional LSIs. Moreover, a power-saving circuit is integrated to suppress standby current. This contributes to energy efficient circuit design

· Features

1. Incorporates a new V_REF variable system for high efficiency operation with low power consumption. Part replacement is simplified as well.
2. Allows direct PWM control, and the optimized circuit ensures high-speed response and enables PWM duty control.
3. Low standby current (0i?μA) under motor stop condition
4. Integrates a shoot-through prevention circuit
5. Equipped with output protection circuits for overcurrent, overvoltage, overheating, and under-voltage lock out
6. Supports TTL input
7. MOSFET on the output stage can achieve small number of external components.
8. Wide operating temperature range: -40ºC to +85ºC.

ROHM's H-bridge driver lineup (i.e. the BD6221F) for brush-commutated motors is available in a variety of voltage ratings, current, and packages. ROHM will continue to utilize its sophisticated proprietary power management technology to develop the most efficient, energy-saving LSIs that meet or exceed even the most demanding customer requirements in a variety of applications, such as industrial equipment and consumer appliances.

· Glossary

• H-bridge driver:
  A circuit used for drive control (i.e. forward/reverse rotation) of brush-commutated motors. The circuit is configured in the shape of an H, hence the name.
• PWM:
  Short for Pulse Width Modulation.
• TTL (Transistor -Transistor Logic) input:
  A circuit whose input logic level (H/L discrimination voltage) is compatible with TTL, a common semiconductor technology for building discrete digital logic integrated circuits.

H-bridge Drivers for Brush Motor