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LT1768CGN Datasheet(PDF) 3 Page - Linear Technology |
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LT1768CGN Datasheet(HTML) 3 Page - Linear Technology |
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3 / 20 page  LT1768 3 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS IPWM PWM Input Bias Current q 0.6 4 µA PWM Duty Cycle VPROG = 1.75 45 50 55 % PWM Frequency CT = 0.22µF (Note 7) 90 110 130 Hz VDIO1/2 DIO1/2 Positive Voltage IDIO = 14mA 1.7 1.9 V DIO1/2 Negative Voltage IDIO = –14mA –1.1 –1.3 V VVCCLAMP VC High Clamp Voltage VPROG = 4.5V (Note 8) 3.6 3.7 3.9 V VC Switching Threshold VPROG = 4.5V (Note 8) 0.5 0.7 0.95 V ISENSE SENSE Input Bias Current VSENSE = 0V –25 –30 µA VSENSE SENSE Threshold for Current Limit VVC = VVCCLAMP, Duty Cycle < 50%, VPROG = 1V 85 100 115 mV VVC = VVCCLAMP, Duty Cycle 80%, VPROG = 1V 90 mV IDIO1/2 to IRMAX Ratio VPROG = 4.5V (Note 5) q 94 98 104 A/A VPROG = 4.5V, IDIO1 or IDIO2 = 0, VVC = 2.5V, (Note 5) 45 49 55 A/A IDIO1/2 to IRMIN Ratio VPROG < 0.75V (Note 6) q 9 10 11 A/A VPROG < 0.75V, IDIO1 or IDIO2 = 0, VVC = 2.5V, (Note 6) 9 10 11 A/A IGATE GATE Drive Peak Source Current 1.5 A GATE Drive Peak Sink Current 1.5 A GATE Drive Saturation Voltage VVIN = 12V, IGATE = –100mA, VPROG = 4.5V q 9.8 10.2 V GATE Drive Clamp Voltage VVIN = 24V, IGATE = –10mA, VPROG = 4.5V q 12.5 14 V GATE Drive Low Saturation Voltage IGATE = 100mA q 0.4 0.6 V Open LAMP Threshold (Note 9) 100 125 150 µA FAULT Pin Saturation Voltage IFAULT = 1mA, IDI01, IDI02 = 0µA, VPROG = 4.5V 0.2 0.3 V FAULT Pin Leakage Current VFAULT = 5V 20 100 nA Thermal ShutdownTemperature 160 °C Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: This is the threshold voltage where the lamp current switches from zero current to minimum lamp current. For VPROG less than the threshold voltage, lamp current will be at zero. For VPROG greater than the threshold voltage, lamp current will be equal to the minimum lamp current. Minimum lamp current is set by the value of the resistor from the RMIN pin to ground. See Applications Information for more details. Note 3: This is the threshold voltage where the device starts to pulse width modulate the lamp current. For VPROG less than the threshold voltage, lamp current will be equal to the minimum lamp current. For VPROG greater than the threshold voltage, lamp current will be pulse width modulated between the minimum lamp current and some higher value. Minimum lamp current is set by the value of the resistor from the RMIN pin to ground. The higher value lamp current is a function of the RMAX resistor to ground value, and the voltages on the PWM and PROG pins. See Applications Information for more details. Note 4: This is the threshold voltage where the lamp current reaches its maximum value. For VPROG greater than the threshold voltage, there will be no increase in lamp current. For VPROG less than the threshold voltage, lamp current will be at some lower value. Maximum lamp current is set by The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, VVIN = 12V, IDIO1/2 = 250µA, VPROG = 0V, VPWM = 2.5V, IRMAX = –100µA, IRMIN = –100µA, unless otherwise specified. the value of the resistor from the RMAX pin to ground. The lower value lamp current is a function of the RMIN and RMAX resistors, and the voltages on the PWM and PROG pins. See Applications Information for more details. Note 5: IDIO1/2 to IRMAX ratio is determined by setting IRMAX to –100µA, VPROG to 4.5V, VVC to 2.5V, and then ramping a DC current out of the DIO1/2 pins from zero until the DC current in the VC voltage source current equals zero. The IDIO1/2 to IRMAX ratio is then defined as (IDIO1 + IDIO2)/IRMAX. See Applications Information for more details. Note 6: IDIO1/2 to IRMIN ratio is determined by setting IRMIN to –100µA, VPROG to 0.75V, VVC to 2.5V, and then ramping a DC current out of the DIO1/2 pins from zero until the DC current in the VC voltage source current equals zero. The IDIO1/2 to IRMIN ratio is then defined as (IDIO1 + IDIO2)/IRMIN. See Applications Information for more details. Note 7: The PWM frequency is set by the equation PWMFREQ = 22Hz/ CT(µF). Note 8: For VC voltages less than the switching threshold, GATE switching is disabled. Note 9: An open lamp will be detected if either IDIO1 or IDIO2 is less than the threshold current for at least 1 full PWM cycle. |
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