Fremont Micro Devices FT822 Preliminary Low THD, High Performance LED Driver FEATURES DESCRIPTION ¾ Extremely Low input current THD The FT822 is a current-mode control PFC LED ¾ Ultra-low (≤50µA) start - up current driver IC. It provides a controlled on-time to regulate ¾ Zero-current switching and minimum off time the output and achieve natural power factor control correction. The highly linear multiplier makes the ¾ Leading edge blanking instead of RC filtering device capable of working in wide input voltage ¾ Adjustable line compensation range applications (from 85V to 265V) with an ¾ Adjustable Output Overvoltage Protection excellent THD. (OVP) ¾ VCC Over Voltage Protection The device features extremely low consumption (≤ ¾ Output Short Circuit Protection(OSCP) 50µA before start-up and ≤ 4mA operating) and ¾ IC Over Temperature Protection(OTP) includes a disable function suitable for IC remote ¾ Open control loop protection ON/OFF control, which makes it easier to comply ¾ Disable function with energy saving norms. ¾ Few external components required ¾ Dip-8/SOP-8 packages The FT822 features fruitful protections like OTP, OVP, APPLICATIONS OSCP. Adjustable output overvoltage protection(OVP) enables to safely handle overvoltage resulting from load disconnection. Output Short ¾ AC/DC LED Driver Applications Circuit Protection (OSCP) reduces the input power ¾ Commercial & industrial lighting consumption when Output Short Circuit is detected. ¾ Architecture detail lighting ¾ Street lamp lighting The totem-pole output stage is capable of driving a MOSFET or IGBT with source and sink currents of ±400mA typically. The device is optimized for low THD LED lighting application up to 60W. www.fremontmicro.com Page 1 of 6 DS822 –A2 Fremont Micro Devices FT822 Preliminary TYPICAL APPLICATION CIRCUIT LED+ VAC 85V—265V EMI 8 5 2 FT822 1 3 6 7 4 LED- Figure 1: Typical Application Circuit ABSOLUTE MAXIMUM RATINGS VCC to GND……………………………………………………………………………………… -0.3V to +28V FB to GND …………………………………………………………………………....………… -0.3V to +7V COMP to GND………………………………………………………………………………………-0.3V to +7V MULT to GND……………………………………………………………………………………. ..-0.3V to +7V CS to GND……………………………………………………………………………………….... ... -0.3V to 7V IAUX……………………………………………………………………………… -5mA (source) / 5mA(sink) Operating Temperature Range………………………………………………………………… -40℃ to +125℃ Junction Temperature…………………………………………………………………………. ...-40℃ to +150℃ Storage Temperature Range ……………………………………………………………………. -60℃ to +150℃ ESD Protection HBM……………………………………………………………………………………….3500V ESD Protection MM……………………………………………………………………………... ………... . 200V * Stresses exceed those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. Functional operation of the device at conditions beyond those listed in the specification is not guaranteed. Prolonged exposure to extreme conditions may affect device reliability or functionality. www.fremontmicro.com Page 2 of 6 DS822 –A2 Fremont Micro Devices FT822 Preliminary PIN CONFIGURATION Top View FB 1 8 VCC COMP 2 7 GATE MULT 3 6 GND CS 4 5 AUX Figure 2: Pin Assignments TERMINAL DESCRIPTION No. PIN 1 FB FUNCTION Inverting input of error amplifier. The information on the output is fed into the pin through an opto-coupler. The pin also as an ON/OFF control input. Output of the error amplifier. A compensation network is placed between this pin and FB 2 COMP ( pin #1) to achieve stability of the control loop and ensure high power factor and low current THD. 3 MULT Main input to the multiplier. This pin is connected to the rectified mains voltage via a resistor divider and provides the sinusoidal reference to the current loop. Input to the PWM comparator. The current flowing through the MOSFET is sensed by a 4 CS resistor, the resulting voltage together with line compensation voltage is applied to this pin and compared with an internal sinusoidal-shaped reference, generated by the multiplier, to determine MOSFET’s turn-off. Input from auxiliary winding sensing resistor divider for demagnetization timing, 5 AUX A negative-going edge after MOSFET’s minimum off time triggers MOSFET’s turn-on. AUX double as OSCP and adjustable OVP latch protection input. 6 GND Ground. 7 GATE Gate drive output. 8 VCC Supply Voltage of both the signal part of the IC and the gate driver. Table1 www.fremontmicro.com Page 3 of 6 DS822 –A2 Fremont Micro Devices FT822 Preliminary ORDERING INFORMATION FT822① DESIGNATOR SYMBOL ① PACKAGE TYPE a SOP-8 b DIP-8 Table 2 5 6 7 8 MARKING RULE FT822 Figure 3 4 3 1 2 ①②③ marking rule ①②③ for internal reference www.fremontmicro.com Page 4 of 6 DS822 –A2 Fremont Micro Devices FT822 Preliminary PAKAGING INFORMATION DIP – 8 Package Symbol Dimensions in Millimeters Dimensions in Inches Min Max Min Max A 3.710 4.310 0.146 0.170 A1 0.510 A2 3.200 3.600 0.126 0.142 B 0.380 0.570 0.015 0.022 B1 0.020 1.524（BSC） 0.060（BSC） C 0.204 0.360 0.008 0.014 D 9.000 9.400 0.354 0.370 E 6.200 6.600 0.244 0.260 E1 7.320 7.920 0.288 0.312 e 2.540 (BSC) 0.100（BSC） L 3.000 3.600 0.118 0.142 E2 8.400 9.000 0.331 0.354 www.fremontmicro.com Page 5 of 6 DS822 –A2 Fremont Micro Devices FT822 Preliminary SOP – 8 Package Dimensions in Millimeters Dimensions in Inches Symbol Mix Max Min Max A 1.350 1.750 0.053 0.069 A1 0.100 0.250 0.004 0.010 A2 1.350 1.550 0.053 0.061 b 0.330 0.510 0.013 0.020 c 0.170 0.250 0.006 0.010 D 4.700 5.100 0.185 0.200 E 3.800 4.000 0.150 0.157 E1 5.800 6.200 0.228 0.244 e 1.270 (BSC) 0.050（BSC） L 0.400 1.270 0.016 0.050 θ 0° 8° 0° 8° www.fremontmicro.com Page 6 of 6 DS822 –A2