LT3001ES5#TRPBF

LT3001 36V 4W No-Opto Isolated Flyback Converter FEATURES DESCRIPTION 4V to 36V Input Voltage Range nn 1.2A, 65V Internal DMOS Power Switch nn Low Quiescent Current nn Boundary Mode Operation at Heavy Load nn Low-Ripple Burst Mode® Operation at Light Load nn Minimum Load VSW(MAX) VSW(MAX) = VIN(MAX) + VZENER(MAX) Example: VIN(HYS) = 2.5µA • R1 Example: Choose 2V of hysteresis, R1 = 806k Determine the UVLO thresholds and calculate R2 resistor value: VREVERSE > 53V A 100V, 0.25A diode from Central Semiconductor (CMHD4448) is chosen. VIN(UVLO+) = 1.242V • (R1+R2) R2 Example: Set VIN UVLO rising threshold to 7.5V, Step 6: Select the RFB Resistor. R2 = 232k Use the following equation to calculate the starting value for RFB: VIN(UVLO+) = 7.5V R FB = NPS • (VOUT + VF ) 100µA 3 • (5V + 0.3V) 100µA VIN(UVLO–) = 5.5V Step 8: Ensure minimum load. The theoretical minimum load can be approximately estimated as: Example: R FB = + 2.5µA • R1 = 159k Depending on the tolerance of standard resistor values, the precise resistor value may not exist. For 1% standard values, a 158k resistor should be close enough. The final RFB value should be adjusted on the measured output voltage. I LOAD(MIN) = 40µH • (360mA)2 • 10.6kHz 2 • 5V = 5.5mA Remember to check the minimum load requirement in real application. The minimum load occurs at the point where the output voltage begins to climb up as the converter delivers more energy than what is consumed at the output. The real minimum load for this application is about 6mA. In this example, a 820Ω resistor is selected as the minimum load. Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications Forismore information www.analog.com subject to change without notice. No license granted by implication or otherwise under any patent or patent rights of Analog Devices. 9 LT3001 PACKAGE DESCRIPTION S5 Package 5-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1635 Rev B) 0.62 MAX 0.95 REF 2.90 BSC (NOTE 4) 1.22 REF 1.4 MIN 3.85 MAX 2.62 REF 2.80 BSC 1.50 – 1.75 (NOTE 4) PIN ONE RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.30 – 0.45 TYP 5 PLCS (NOTE 3) 0.95 BSC 0.80 – 0.90 0.20 BSC 0.30 – 0.50 REF 0.09 – 0.20 (NOTE 3) NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 10 0.01 – 0.10 1.00 MAX DATUM ‘A’ 1.90 BSC S5 TSOT-23 0302 REV B Rev. 0 08/19 www.analog.com For more information www.analog.com  ANALOG DEVICES, INC. 2019