PLED-T-xxxKA Rev.05-2010 PLEDKA-SERIES DIP16 Package WIRE Connection Step-Down Converter Constant Current High Efficiency Dimming Function Remote Control Mainzer Straße 151–153 D-55299 Nackenheim Tel. +49 6135 7026-0 Fax: +49 6135 931070 www.peak-electronics.de [email protected] The PLED-T-xxxKA is a high efficiency wire connected step-down converter optimized to drive high current LEDs. The control algorithm allows highly efficient and accurate LED current regulation. The device operates from 7VDC up to 30VDC and provides an externally adjustable output current and output power up to 24 Watts. Compact DIP16 size allows designers to integrate this driver together with LED module. UL-94V0 grade molded case with high grade filling material provide excellent fire proof characters. Suitable also in mobile lighting system. All specifications typical at Ta=25°C, nominal input voltage and full load unless otherwise specified Input Specifications Voltage Range Input Filter 7 – 30 VDC wide input Capacitor Output Specifications Voltage (Vin: 30V) Current (Vin-Vout > 2V to 3V) Output Current Accuracy Output Power Ripple and Noise (20MHz limited) 2 – 28 VDC See table ± 6% (350mA) / ± 8% (others) See Table, max. 200 - 300 mV p-p General Specifications Efficiency Operating Frequency Capacitive Load Humidity Reliability Calculated MTBF (MIL-HDBK-217F) See Table, typ. See Table 47 uF, max. 95% rel H > 5 Mhrs Physical Specifications Case Material Potting Material Lead Wires Weight Black Plastic (with Non-Conductive Base) Epoxy / Silicon (UL94V-0 rated) UL 1015 / CSA TEM (22AWG 600V 105°C) ~ 11 g, typ. Environment Specifications Operating Temperature Maximum Case Temperature Storage Temperature Cooling Thermal Impedance (Free Air Convection) Temperature Coefficient RoHS conform -40 to +85 °C (for 100%) -40 to +71 °C (1000mA type, for 100%) 105°C -40 to +125°C Free Air Convection (10mm distance required) 35°C / W (350mA) 40°C / W (500mA), 50°C / W (700 / 1000mA) ± 0.03%/°C (350mA) / ± 0.08%/°C (others) Soldering 260°C, 10 sec. max. PLEDKA-Series – PLED-T-xxxKA – Single Output – DIP16- Wire Connected - Plastic Case Specification can change without a notice – We accept no liability for any inaccuracy or printing errors. Page 1/6 Selection Guide ltag t Vo Inpu Order # PLED-T-350KA PLED-T-500KA PLED-T-700KA PLED-T-1000KA e 7-30 7-30 7-30 7-30 ) kH z cy ( A) DC) n V e m ( . ( u max age %) re n t F re q V o lt cy ( Cur (W ) in g t t n t r a u u e e i r p p c Out Out Pow Ope E ffi C) (V D 2-28 2-28 2-28 2-28 350 ±6% 500 ±8% 700 ±8% 1000 ±8% 8 14 20 24 40 - 370 70 - 330 55 - 320 50 - 300 95 95 95 95 If you need other specifications, please ask. 100.00 (3.94) 10.00 (0.39) 11.00 (0.43) 14.00 (0.55) Package / Pinning / Derating 100% PLED-T-350 / 500 / 700 KA 75% PLED-T-1000KA OUTPUT POWER TEMPERATURE DERATING GRAPH 50% 25% 71 -40 -20 0 20 40 60 PIN CONNECTIONS 1 (black) - Vin 2 (white) PWM/ON/OFF 8 (blue) - LED 9 (yellow) + LED 16 (red) + Vin No connection between input and output is allowed! 85 80 100 AMBIENT TEMPERATURE (°C) PLEDKA-Series – PLED-T-xxxKA – Single Output – DIP16- Wire Connected - Plastic Case Specification can change without a notice – We accept no liability for any inaccuracy or printing errors. Page 2/6 App Notes PWM DIMMING AND REMOTE ON/OFF CONTROL: ( Leave it open if not used.) DC ON: Open or 0.3V<Vadj<1.25V DC OFF: Vadj<0.15V (Shutdown) Max. Remote Pin Drive Current: 1 mA Max. Quiescent Input Current in Shutdown Mode (Vin=30V) 25 uA Recommended max. Operation Frequency: 1 kHz Adjust Output Current 1% to 100% ANALOG DIMMING CONTROL: Input Voltage Range: 0.3V to 1.25V Adjust Output Current (Vin – Vout <20V) 25% to 100% Control Voltage Limits ON: 0.2V – 0.3V OFF: 0.15V – 0.25V Max. Analog Pin Drive Current (Vadj = 1.25V): 1 mA Note: 1.Note about the polarity of input power , reversed power supply may damage the circuit. 2.Leave the pin VADJ opened while not in use , Grounded can shut the driver off and connect to Vin Power may burn the circuit. Recommended additional input filter: PLED PLEDKA-Series – PLED-T-xxxKA – Single Output – DIP16- Wire Connected - Plastic Case Specification can change without a notice – We accept no liability for any inaccuracy or printing errors. Page 3/6 App Notes for PLED-T-xxxKA Typical application: PLED PLED PLED Output current adjustment by external DC control voltage: PLED PLED The nominal output current is given by: PLED Iout (nom) = IoutxVadj 1.25 Resistor dimming: By connecting a variable resistor between ADJ and GND, simple dimming can be achieved. Capacitor Cadj is optional for better AC mains interference and HF noise rejection. Recommend value of Cadj is 0.22uF. PLED The output current can be determined using the equation: Iout (nom ) = IoutxRadj ( Radj + 200 k ) If the value of RADJ is 0 to 2M ohm, the maximum adjust range of output current is 25% to 90%. (For Vin-Vout<20Vdc) PLEDKA-Series – PLED-T-xxxKA – Single Output – DIP16- Wire Connected - Plastic Case Specification can change without a notice – We accept no liability for any inaccuracy or printing errors. Page 4/6 App Notes Output current adjustment by PWM control: Directly driving ADJ input A pulse width modulated (PWM) signal with duty cycle DPWM can be applied to the ADJ pin, as shown below: PLED Driving the ADJ input via open collector transistor The diode and resistor suppress possible high amplitude negative spikes on the ADJ input resulting from the drain-source capacitance of the transistor. Negative spikes at the input to the device should be avoided as they may cause errors in output current, or erratic device operation. PLED Iout (nom) = IoutxDpwm [If PWM freq. <500 Hz, for 0<Dpwm<1] [If PWM freq. >10 kHz, for 0.16<Dpwm<1] Driving the ADJ input from a microcontroller: Another possibility is to drive the device from the open drain output of a microcontroller. The diagram below shows one method of doing this: The diode and resistor suppress possible high amplitude negative spikes on the ADJ input resulting from the drainsource capacitance of the FET. Negative spikes at the input to the device should be avoided as they may cause errors in output current or erratic device operation. PLED Output current adjustment by PWM control (Dimming): To avoid visible flicker the PWM signal must be greater than 100Hz. PWM Wire 2 (Vadj) Wire 1 Output current adjustment by PWM control (Flash): PWM Wire 2 (Vadj) Wire 1 PLEDKA-Series – PLED-T-xxxKA – Single Output – DIP16- Wire Connected - Plastic Case Specification can change without a notice – We accept no liability for any inaccuracy or printing errors. Page 5/6 App Notes Output current adjustment by external DC control voltage: NOTE: In this application, the LED modules of each LED drivers should be independent from electrical connection to the others and input power - this is to prevent the damaging to LED drivers also to avoid the unnecessary interference among each LED module driven by the LED driver. Thermal feedback circuit: The selection of components for the thermal feedback circuit is not only dependent on the PLED choice of R2 and R3, but also on the amount of heat sink area required to extract heat from the LEDs. To maximize the light output at high ambient or operating temperature conditions, the LEDs must have a sufficient thermal extraction path otherwise the thermal control circuit will effect current drive reduction in non-optimal conditions. The thermal control threshold point is set by adjusting R2. For this design, three values (33k, 22k and 10k) were evaluated. These values were chosen to give break points at approximately 25°C, 40°C and 60°C. Note that the light output will not continually dim to zero - the thermal control is applying DC control to the ADJ pin and therefore has a dimming ratio from maximum current of approximately 5:1. Once the reduced DC level goes below the shutdown threshold of around 200mV, the LED drive current will fall to zero and the LEDs will be extinguished. The slope of the current reduction is determined by the beta value of the thermistor. The larger the beta value, the sharper will be the resultant current control response. The slope of the current reduction is also affected by Q1's base emitter voltage (VBE) variation with temperature. PLEDKA-Series – PLED-T-xxxKA – Single Output – DIP16- Wire Connected - Plastic Case Specification can change without a notice – We accept no liability for any inaccuracy or printing errors. Page 6/6