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LT1508I Datasheet(PDF) 2 Page - Linear Technology |
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LT1508I Datasheet(HTML) 2 Page - Linear Technology |
2 / 16 page 2 LT1508 By using fixed high frequency PWM current averaging without the need for slope compensation, the LT1508 achieves far lower line current distortion with a smaller magnetic element than systems that use either peak current detection, or zero current switching approach, in both continuous and discontinuous modes of operation. The LT1508 also provides filtering capability to reject line DESCRIPTION switching noise which can cause instability when fed into the multiplier. Line current dead zone is minimized with low bias voltage at the current input to the multiplier. The LT1508 provides many protection features including peak current limiting and overvoltage protection. Implemented with a very high speed process, the LT1508 can be operated at frequencies as high as 300kHz. ABSOLUTE MAXIMUM RATINGS Supply Voltage ........................................................ 27V GTDR Current Continuous ...................................... 0.5A GTDR Output Energy ................................................ 5 µJ IAC, RSET, PKLIM Input Current .............................. 20mA VSENSE, OVP Input Voltage .................................... VMAX ILIM, VC Input Voltage ................................................ 8V ISENSE, MOUT Input Current ................................... ±5mA Operating Junction Temperature Range LT1508C ................................................ 0 °C to 100°C LT1508I ............................................ – 40 °C to 125°C Thermal Resistance (Junction-to-Ambient) N Package ................................................... 100 °C/W SW Package ................................................ 120 °C/W PACKAGE/ORDER INFORMATION Consult factory for Military grade parts. 1 2 3 4 5 6 7 8 9 10 TOP VIEW SW PACKAGE 20-LEAD PLASTIC SO WIDE N PACKAGE 20-LEAD PDIP 20 19 18 17 16 15 14 13 12 11 GTDR1 GND2 GND1 CSET PKLIM CAOUT ISENSE MOUT IAC VAOUT GTDR2 ILIM VC VCC SS1 RSET VSENSE SS2 VREF OVP TJMAX = 125°C, θJA = 100°C/ W (N) TJMAX = 125°C, θJA = 120°C/ W (SW) ORDER PART NUMBER PARAMETER CONDITIONS MIN TYP MAX UNITS Overall Supply Current (VCC in Undervoltage Lockout) VCC = Lockout Voltage – 0.2V q 0.25 0.45 mA Supply Current On 11.5V ≤ VCC ≤ VMAX q 13 19 mA VCC Turn-On Threshold (Undervoltage Lockout) q 15.5 16.5 17.5 V VCC Turn-Off Threshold q 9.5 10.5 11.5 V Voltage Amplifier (PFC Section) Voltage Amp Offset VAOUT = 3.5V q –10 10 mV Input Bias Current VSENSE = 0V to 7V q – 25 – 250 nA Voltage Gain 70 100 dB Voltage Amp Unity-Gain Bandwidth 3 MHz Voltage Amp Output High (Internally Clamped) q 11.3 13.3 V Voltage Amp Output Low q 1.1 2 V Voltage Amp Short-Circuit Current VAOUT = 0V q 3 8 17 mA ELECTRICAL CHARACTERISTICS Maximum operating voltage (VMAX) = 25V, VCC = 18V, RSET = 15k to GND, CSET = 1nF to GND, IAC = 100µA, ISENSE = 0V, CAOUT = 3.5V, VAOUT = 5V, OVP = VREF. No load on any outputs unless otherwise noted. LT1508CN LT1508CSW LT1508IN LT1508ISW |
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