DATASHEET SEARCH SITE | WWW.ALLDATASHEET.COM
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 3
Technical content
Features
■ 12V to 450V input voltage range ■ Adjustable 1.20V to 440V output regulation ■ 5% output voltage tolerance ■ Output current limiting ■ 10µA typical ADJ current ■ Internal junction temperature limiting
Applications
■ Off-line SMPS startup circuits ■ Adjustable high voltage constant current source ■ Industrial Controls ■ Motor controls ■ Battery chargers ■ Power supplies General Description The FRR8 is a high voltage, low output cu rrent, adjustable linear regulator. It has a wide operating input voltage range of 12V to 450V. The output voltage can be adjusted from 1.20V t o 440V provided that the input voltage is at l east 10V greater than the output voltage. The output voltage can be adjusted by means of two external resistors R1 and R2 as shown in the typical application circuits. The AnR8 regulates the voltage difference between V OUT and ADJ pins to a nominal value of 1.20V. The 1.20V is amplified by the external resistor ratio R1 and R2. An internal constant bias current of typically 10uA is cnnnected to ADJ pin. This increases VOUT by a constant viltage of 10uA times R2. The AnR8 has cu rrent limiti ng and temperature limiting. The output current limit is typically 15mA and the minimum temperature limit is 125℃. An output short circuit current will therefore be limited to 15mA. When the junction temperature reaches its temperature limit, the output current and/or output voltage will decrease to keep the junction temperature from exceeding its temperature limit. For SMPS start-up circuit applications, the AnR8 turns off when an external voltage greater than the output voltage of the FRR8 is applied to V OUT of the AnR8. To maintain DC output current of 500uA are required. The device is available in SOT-8 9 and TO-252 packages. FRR8 Block Diagram and Typical Application *Required for conditions where VIN is less than VOUT. FRR8 stability, a bypass capacitor of 1.0uF or larger and a minimum
Revision No : 0 Thermal Characteristics Pin Configurations Package Power Dissipation @ TA=25°C θJC °C/W θJA °C/W TO-92 0.74W 125 170 TO-243AA 1.6W 15 78† TO-252 2.5W 6.25 50† † Mounted on FR4 board, 25mm x 25mm x 1 57mm Significant PD increase possible on ceramic substrate Absolute Maximum Ratings VIN Input Voltage -0.5V to +480V* Output Voltage Range -0.5V to +470V Operating Ambient Temperature Range Operating Junction Temperature Range Storage Temperature Range *Voltages referenced to ADJ
Electrical Characteristics
Test conditions unless otherwise specified: -40°C < TA < 85°C. Symbol Parameter Min Typ Max Units Test Conditions VIN - VOUT Input to Output Voltage Difference 12 450 V VOUT Overall Output Voltage Regulation 1.14 1.20 1.26 V 12V< VIN <400V, R1=2.4KΩ, R2=0 VOUT Overall Output Voltage Regulation 375 400 425 V R1=2.4KΩ, R2=782KΩ ∆VOUT Line Regulation 0.003 0.01 %/V 15V< VIN <400V, VOUT =5V, IOUT =0.5mA ∆VOUT Load Regulation 1.4 3.0 % VIN =15V, VOUT =5V, 0.5mA<IOUT <10mA ∆VOUT Temperature Regulation -1 +1 % VIN =15V, VOUT=5V, IOUT=10mA, -40°C<TA<85°C IOUT Output Current Limit 10 20 mA TJ < 85°C, VIN - VOUT = 10V IOUT Output Current Limit 0.5 mA TJ > 125°C, VIN - VOUT = 450V IOUT Minimum Output Current 0.3 0.5 mA Includes R1 and load current IADJ Adjust Output Current 5 10 15 µA C2 Minimum Output Load Capacitance 1 µF DVOUT/DVIN Ripple Rejection Ratio 50 60 dB 120Hz, VOUT = 5V TLIMIT Junction Temperature Limit 125 °C Functional Block Diagram VIN VO U T ADJ TO-92 1 2 3 TO-243AA 1 2, TAB 3 TO-252 1 2 (TAB) 3 Overtemp & Overcurrent Pass Element VOUT ADJ VIN FRR8 -40°C to +85°C -40°C to +125°C -40°C to +150°C 2016.09.28