OZ9976 Ver la hoja de datos (PDF) - Unspecified
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OZ9976 Datasheet PDF : 31 Pages
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OZ9908B
FEATURES
• Drives up to 6 strings of LEDs
• Up to 350mA LED current per string
• Supports multiple IC operation synchronization
• Boost drive outputs 180 degree phase-shift between master and slave ICs
• Analog dimming control
• Individual PWM dimming for each string
• Over-voltage and over-current protection
• LED open/short circuit protection
• LED fault status output
GENERAL DESCRIPTION
The OZ9908B is a high performance LED driver controller optimized for large screen
LED backlight LCD TV applications. It provides an integrated six channel LED current
regulation control circuit. Using external balance transistors for each channel, the IC
is capable of driving a current up to 350mA per LED channel.
OZ9908B provides 6 individual external Pulse Width Modulation (PWM) dimming
interfaces for its respective LED string. The IC is suitable for LCD TV applications
using a local-dimming control backlight.
When using multiple ICs, the operating frequency can be synchronized with a 180o
phase-shift between the drive outputs of each IC. These features greatly reduce the
interference between ICs.
APPLICATIONS
• LCD TV
APPLICATION DIAGRAM
OZ9984
FEATURES
• Drives up to 4 LED strings in parallel
• Supports up to 350mA LED current per string
• Integrated LED current balance control circuit
• Multi-chip parallel operation
• Analog dimming control
• Over-voltage and LED short circuit protection
• Soft start function
GENERAL DESCRIPTION
OZ9984 is a high efficiency LED driver IC that works in conjunction with a primary
side external Pulse Width Modulation (PWM) controller, for offline, isolated LED light-
ing application. It has four (4) LED current sense inputs in an “OR” configuration to
ensure uniform lighting of the LEDs. It can drive up to 4 strings of LEDs in parallel
and up to 9 LEDs per string connected in series.
OZ9984 supports up to 350mA of LED current per string. It is designed in such a
way that if any LED string is damaged during normal operation, the remaining string
(s) continue normal operation. Multi-chip parallel operation supports additional LED
strings.
APPLICATIONS
• LCD TV
• General Lighting
APPLICATION DIAGRAM
U.S. Patent #7,498,793; 7,847,783; and more patents pending.
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U.S. Patent #7,847,783; and more patents pending.
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