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HV9961 Datasheet(PDF) 1 Page - Supertex, Inc |
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HV9961 Datasheet(HTML) 1 Page - Supertex, Inc |
1 / 9 page Supertex inc. HV9961 Supertex inc. www.supertex.com Features ► Fast average current control ► Programmable constant off-time switching ► Linear dimming input ► PWM dimming input ► Output short circuit protection with skip mode ► Ambient operating temperature -40OC to +125OC ► Pin-compatible with the HV9910B Applications ► DC/DC or AC/DC LED driver applications ► LED backlight driver for LCD displays ► General purpose constant current source ► LED signage and displays ► Architectural and decorative LED lighting ► LED street lighting General Description The HV9961 is an average current mode control LED driver IC operating in a constant off-time mode. Unlike HV9910B, this control IC does not produce a peak-to-average error, and therefore greatly improves accuracy, line and load regulation of the LED current without any need for loop compensation or high-side current sensing. The output LED current accuracy is ±3%. The IC is equipped with a current limit comparator for hiccup- mode output short circuit protection. The HV9961 can be powered from an 8.0 - 450V supply. A PWM dimming input is provided that accepts an external control TTL compatible signal. The output current can be programmed by an internal 275mV reference, or controlled externally through a 0 - 1.5V dimming input. HV9961 is pin-to-pin compatible with HV9910B and it can be used as a drop-in replacement for many applications to improve the LED current accuracy and regulation. Typical Application Circuit LED Driver with Average-Mode Constant Current Control 1 4 2 8 5 6 7 3 HV9961 VIN GATE PWMD LD VDD RT CS GND LED Load Sets LED Current 8.0 - 450VDC R CS R T |
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