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LX1695IM Datasheet(PDF) 2 Page - Microsemi Corporation |
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LX1695IM Datasheet(HTML) 2 Page - Microsemi Corporation |
2 / 10 page LX1695 PRODUCTION DATA SHEET Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 2 Switched Royer CCFL Inverter Monitor IC Copyright © 2004 Rev. 1.0a, 2006-01-06 TM ® ABSOLUTE MAXIMUM RATINGS Supply Voltage (VDD) ........................................................................................6V Inputs (BRITE_IN, OLSNS, FLT_DLY, ENABLE, DIM_FREQ)................. VDD Output Current (ROYER) ...........................................................................150mA RoHS / Pb-free Peak Package Solder Reflow Temperature (40 seconds Maximum Exposure) .....................................................................................260°C (+0, -5) Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of specified terminal . TH ERMAL DATA M Plastic 8-Pin DIP THERMAL RESISTANCE -JUNCTION AMBIENT, θ JA 85 °C/W DM Plastic 8-Pin SOIC THERMAL RESISTANCE -JUNCTION AMBIENT, θ JA 163 °C/W Junction Temperature Calculation: TJ = TA + (PD x θJA). The θJA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. PACKAGE PIN OUT 1 2 3 4 5 6 7 8 DIM_FREQ ENABLE FLT_DLY BRITE_IN OLSNS GND ROYER VDD DM Package (Top View) 1 2 3 45 6 7 8 DIM_FREQ ENABLE FLT_DLY BRITE_IN VDD ROYER GND OLSNS M Package (Top View) RoHS / Pb-free 100% Matte Tin Lead Finish FUNCTIONAL PIN DESCRIPTION Name Description VDD Input Voltage. The IC will be functional and in specifications when this pin is between 4.5 and 5.5VDC. GND Ground BRITE_IN Lamp Brightness Control. A DC input of 0 to 2V controls the duty cycle of the Royer output. Zero volts corresponds to minimum duty cycle (3.125%), maximum input voltage must yield 100% duty cycle. BRITE_IN has a high input impedance. OL_SNS Open Lamp Sense Input. This input receives rectified and filtered voltages from each Royer transformer secondary winding that are proportional to lamp current amplitude. These signals are diode OR’ed and compared to 3VDC at the OL_SNS input. If an under limit condition is detected, a fault is declared and the output is turned off. This condition is latched and can only be cleared by cycling the main power input or the ENABLE input signal off and on. ROYER Royer Bias Drive Output. This output signal drives external transistors that feed bias currents to one or more oscillators to turn them on. Output drive is totem pole and must be capable of ±50mA at 0.4 and 4.0V output when the supply voltage is 4.5 to 5.5 volts. FLT_DLY Fault Delay. An external resistor and capacitor at this pin program the time that open lamp fault detection is disabled following power on or an ENABLE low to high transition. By choosing the appropriate resistor and capacitor combination, delay time may be as high as 5 seconds DIM_FREQ A resistor to ground determines the frequency of the dual slope ramp generator for the digital dimming PWM. This pin may be overdriven through a resistor with totem pole output logic gates to force an external clock to over ride the internal clock, allowing the ROYER output to be synchronized to an external frequency without using another package pin. Input voltage levels of the external pulse are as follows: High state is; 2.9 to 5.5V minus 0.4 volts noise margin for minimum of 2.5 volts. Low state is; 0 to 0.36V plus 0.44 volts for noise margin for total of 0.8 volts. ENABLE A positive logic level enables the ROYER output pin. A low level turns it off, resets the fault latch and discharges the FLT_DLY capacitor. Logic threshold is about 1.6V. Upon ENABLE going high (True), the fault delay capacitor is allowed to charge, initiating the delay. |
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