FEATURES: Step Down DC/DC LED driver Operating Temperature range 4ºC to 85ºC Constant current output Open and Short LED Protection Wide (4:) input voltage range PWM/Digital and Analog Voltage dimming High efficiency up to 95% Remote ON/OFF Control Models Single output Model Input Voltage (V) Output Voltage (V) Output Current (ma) Efficiency (%) Package Type AMLDL33Z 73 228 3 95 DIP4 AMLDL335Z 73 228 35 95 DIP4 AMLDL35Z 73 228 5 95 DIP6 AMLDL36Z 73 228 6 95 DIP6 AMLDL37Z 73 228 7 95 DIP6 AMLDL3Z 73 228 95 DIP6 NOTE: All specifications in this datasheet are measured at an ambient temperature of C, humidity<75%, nominal input voltage and at rated output load unless otherwise specified. Input Specifications Parameters Nominal Typical Maximum Units Voltage range 24 73 VDC Filter Capacitor Absolute Maximum Rating 4 VDC Peak Input Voltage time 5 ms DC/DC ON (Leave open if not used) ON Open or.3v<vadj<. DC/DC OFF OFF(shutdown) Vadj<.5 Maximum Remote pin drive current Vadj =.V ma Quiescent Current in Shutdown mode Vin = 3V, Vadj <.5. ma On/Off Control (Digital Control) Max PWM Frequency KHz Minimum Switch ON/OFF time 2 ns On/Off Control (Analog Dimming Control) (Leave open if not used) Input voltage range.3. VDC Drive with DC Voltage.3V < <.V to adjust output current from % to % Output current adjustment* Vin<2 % Control Voltage Range limits ON.2.3V (Vadj rise) OFF.5.V (Vadj fall) Maximum Analog pin drive current Vadj =.V ma Output Specifications Parameters Conditions Typical Maximum Units Current accuracy ±6 % Output Voltage range V input = 3V 228 VDC Output current Vin Vout >.5V to 3V 3 ma Short Circuit protection Regulated at the rated current for each model Output no load Protection Continuously Max load capacitance 47 µf Temperature coefficient Ta = 4 to 85 C ±.5 %/ o C Ripple & Noise 2MHz Bandwidth mv pp General Specifications Parameters Conditions Typical Maximum Units Switching frequency % load 4 38 KHz Operating temperature 4 to 85 o C Storage temperature 4 to o C F 5e R9.G of 4 North America only
General Specifications (continued) Parameters Conditions Typical Maximum Units Maximum case temperature Thermal Impedance Free air convection 4 o C/W Cooling Free air convection Humidity 95 % RH Case material NonConductive Black Plastic (UL94V rated) Weight 2.6 (DIP4) 6.2 (DIP 6) g Dimensions (L x W x H) DIP 4.8 x.4 x.27 inches 2.32 x.6 x 6.88 mm DIP 6.8 x.4 x.4 inches 23.37 x 3.97 x.6 mm MTBF > 5 hrs (MILHDBK27 F at o C) Maximum Soldering Temperature.5mm from case for sec. 26 o C NOTES:.Reversed polarity at the input power will damage the driver. The input ground must not be connected to the negative output. 2.Leave the pin opened if not used, grounding will shut the driver off, connecting to Vin will damage the driver. 3.Maximum output open voltage is equal to input voltage Safety Specifications Parameters Agency approvals Standards CE EN 555 (CISPR22) IEC 642 (Perf. Criteria A) IEC 643 (Perf. Criteria A) IEC 644 (Perf. Criteria A) IEC 646 (Perf. Criteria A) IEC 648 (Perf. Criteria A) Pin Out Specifications DIP 4 DIP 6 Pin Single V Input DC Supply 2 Vadj PWM/ON/OFF or not used 7 V Output LED Cathode connection 8 V Output LED Anode connection 4 V Input DC Supply Derating Free Air Convection Pin Single V Input DC Supply 2 V Input DC Supply 3 Vadj PWM/ON/OFF or not used 7 V Output LED Cathode connection 8 V Output LED Cathode connection 9 V Output LED Anode connection V Output LED Anode connection 5 V Input DC Supply 6 V Input DC Supply o C Output Power (%) 8 6 4 2 Safe Operating Area AMLDL33Z AMLDL335Z AMLDL35Z AMLDL36Z AMLDL37Z AMLDL3Z 4 2 2 4 6 7 85 8 Ambient Temperature º C F 5e R9.G 2 of 4 North America only
Dimensions DIP 4: AMLDL33Z & AMLDL335Z 2.32 (.8) 2.54 (.) 5.24 (.6) DIP 6: AMLDL35Z, AMLDL36Z, AMLDL 37Z, AMLDL3Z 23.4 (.92) 2.54 (.) 7.78 (.7) 2.8 (.).6 (.4) 4 2 7 Bottom View 8 5.8 (.2) 4. (.55).92 (.8) 2 3 7 8 6 Bottom View 5 9.6 (.4) Printed Face.5 (.2) Printed Face.5 (.2) 6.88 (.27).6 (.4) 3.5 (.2).5 (.2) 3.5 (.2) Application circuit examples: st LED st LED Analogue DIM PWM Dim/ON/OFF Analogue DIM PWM Dim/ON/OFF AC In 5Vac to 2Vac.uF optional AC In uf to 33uF Vin Analogue DIM PWM Dim/ON/OFF st LED F 5e R9.G 3 of 4 North America only
Output Current Adjustment by External DC Control Voltage: The nominal output current is given by: Iout.8 x Vadj X Model Number X AMLDL33Z.327 AMLDL335Z.28 AMLDL35Z.97 AMLDL36Z.65 AMLDL37Z.388 AMLDL3Z.95.3.V st LED Vctrl 5v Vin R 3K R2 K st LED K K TL43 K st LED = R2 R R2 X Vctrl Resistive Dimming Control A simplified dimming control can be achieved using a variable resistor connected between and. Capacitor CADJ is optional, it is installed to limit AC mains interference and high frequency noise. The recommended value of CADJ is.22µf. NOTE: Typical error is ±% with resistive dimming control CADJ RADJ st LED F 5e R9.G 4 of 4 North America only
Output Current Adjustment by PWM Control: Driving Directly A Pulse Width Modulated (PWM) signal with a duty cycle of DPWM can be applied directly to pin as shown below. The output current is given by:. x DPWM Iout [for <DPWM<] X Model Number X AMLDL33Z.327 AMLDL335Z.28 AMLDL35Z.97 AMLDL36Z.65 AMLDL37Z.388 AMLDL3Z.95.V V PWM st LED Driving Via Open Collector Transistor The can also be driven via an open collector transistor as shown below. The diode and resistor serve to suppress any possible high amplitude negative voltage spikes to the input resulting from the collector to emitter capacitance of the transistor. Any negative voltage spikes will cause errors in output current and/or unstable driver operation..v V PWM K st LED Driving the from a Microcontroller The can be driven from an open drain output of a microcontroller as shown below. The diode and resistor serve to suppress any possible high amplitude negative voltage spikes to the input resulting from the drain to source capacitance of the FET. Any negative voltage spikes will cause errors in output current and/or unstable driver operation. MCU K st LED F 5e R9.G 5 of 4 North America only
Output Current Adjustment by PWM Control (Dimming): A PWM signal must have a frequency of greater than Hz to prevent any visible flicker. Vin uf 35V AMSR785Z nf uf 6V N448 VR K 47 7 6 8 4 Vcc Reset Discharge Threshold Out 3 nf 2SD782K 2 K N448 PMW Pin 2 () nf 2 Trigger NE 555 CRT_V 5 nf Pin Output Current Adjustment by PWM Control (Flash): Vin uf 35V AMSR785Z nf uf 6V VR K 7 8 4 Vcc Reset Discharge nf 2K 6 Threshold Out 3 2 2SD782K K N448 PMW Pin 2 () uf 6V 2 Trigger NE 555 CRT_V 5 nf Pin Recommended Class B EMI Filter: Vin uf L Analogue DIM PWM Dim/ON/OFF st LED Model Number Inductor Value (µh) AMLDL33Z 68 AMLDL335Z 68 AMLDL35Z 27 AMLDL36Z 27 AMLDL37Z 27 AMLDL3Z 27 F 5e R9.G 6 of 4 North America only
Thermal Feedback Circuit Vin R 4.7K BZX284C6V2 R3 K Thermistor B 39 R2 K Q K Vin st LED Thermally Connected The selection of components for the thermal feedback circuit is depends on the choice of R2 and R3 and the effectiveness of the LED heatsink. To optimize the LED brightness control at high temperatures, the LEDs must have a sufficient thermal extraction path, if not the reduction in drive current will not be optimal. The thermal control threshold points are set by adjusting R2. Three values (33K, 22K, and K) were tested. These values were chosen to provide thermal break points of approximately ºC, 4ºC, and 6ºC. Note, that the LED drive current will not continually dim to zero the thermal controls applying DC control to that pin has a dimming ratio from maximum current of approximately 5:. Once the reduced DC level drops below the shutdown threshold of around 2mV, the LED drive current will fall to zero and the LEDs will be off. 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 Q s base emitter voltage variation with temperature. F 5e R9.G 7 of 4 North America only
Output Current Adjustment By External DC Control Voltage: N448 6.2K.V K st LED N448 6.2K.V K st LED 5V ~ Vin N448 6.2K.V K st LED 4.7K TL43 OUT: ~ 2.5V K N448 6.2K.V K st LED N448 6.2K.V K st LED N448 6.2K.V K st LED F 5e R9.G 8 of 4 North America only
Typical Characteristics: AMLDL33Z Frequency (KHz) 4 375 35 3 3 2 75 5 75 5 LED Operating Frequency vs Input Voltage 7 8 9 2 3 4 5 6 7 8 9 2 2 22 23 24 26 27 28 29 3 6 LED 7 LED Efficiency (%) 95 9 85 8 75 7 LED Efficiency vs Vin ( Forward Voltage = 3.5V per LED) 7 8 9 2 3 4 5 6 7 8 9 2 2 22 23 24 26 27 28 29 3 6 LED 7 LED ILED (ma) Output Current Vs 3 3 2 75 5 75 5..35.45.55.65.75.85.95.5.5..3.35 (V) F 5e R9.G 9 of 4 North America only
Typical Characteristics: AMLDL335Z Frequency (KHz) 375 35 3 3 2 75 5 75 5 LED LED Operating Frequency vs Input Voltage 7 8 9 2345678922222324262728293 6 LED 7 LED Efficiency (%) 95. 9. 85. 8. 75. 7. LED Efficiency vs Vin 6 LED 7 LED 7 8 9 2 3 4 5 6 7 8 9 2 2 22 23 24 26 27 28 29 3 375 35 3 3 2 75 5 75 5 ILED (ma) Output Current Vs..35.45.55.65.75.85.95.5.5..3.35 (V) F 5e R9.G of 4 North America only
Typical Characteristics: AMLDL35Z Frequency (KHz) 35 3 3 2 75 5 LED 75 5 LED Operating Frequency vs Input Voltage 7 8 9 2 3 4 5 6 7 8 9 2 2 22 23 24 26 27 28 29 3 6 LED 7 LED Efficiency (%).% 95.% 9.% 85.% 8.% 75.% 7.% LED Efficiency vs Vin 6 LED 7 LED 7 8 9 2 3 4 5 6 7 8 9 2 2 22 23 24 26 27 28 29 3 ILED (ma) 6 Output Current Vs 5 4 3 2..2.3.4.5.6.7.8.9..2.3 (V) F 5e R9.G of 4 North America only
Typical Characteristics: AMLDL36Z Operating Frequency vs Input Voltage Frequency (KHz) 3 3 2 75 5 75 LED 7 LED 5 6 LED 7 8 9 2345678922222324262728293 Efficiency (%) % 95% 9% 85% 8% 75% 7% LED Efficiency vs Vin 7 8 9 2345678922222324262728293 6 LED 7 LED ILED (ma) Output Current Vs 7 6 5 4 3 2..2.3.4.5.6.7.8.9..2.3 (V) F 5e R9.G 2 of 4 North America only
Typical Characteristics: AMLDL37Z Operating Frequency vs Input Frequency (KHz) ) 35 3 3 2 75 5 75 LED 7 LED 5 6 LED 7 8 9 2 3 4 5 6 7 8 9 2 2 22 23 24 26 27 28 29 3 Efficiency (%) % 95% 9% 85% 8% 75% 7% LED Efficiency vs Vin 6 LED 7 8 9 2345678922222324262728293 7 LED Output Current Vs ILED (ma) 7 6 5 4 3 2.5.5..35.45.55.65.75.85.95.5.5. (V) F 5e R9.G 3 of 4 North America only
Typical Characteristics: AMLD3Z Frequency (KHz) 3 Operating Frequency vs Input Voltage Efficiency (%) % 95% Efficiency vs Vin 6 LED 7 LED 2 75 5 9% 85% LED LED 8% 75 5 7 LED 6 LED 7 8 9 2 3 4 5 6 7 8 9 2 2 22 23 24 26 27 28 29 3 75% 7% 7 8 9 2 3 4 5 6 7 8 9 2 2 22 23 24 26 27 28 29 3 ILED (ma) Output Current Vs 9 8 7 6 5 4 3 2..2.3.4.5.6.7.8.9..2.3 (V) NOTE:. Datasheets are updated as needed and as such, specifications are subject to change without notice. Once printed or downloaded, datasheets are no longer controlled by Aimtec; refer to www.aimtec.com for the most current product specifications. 2. Product labels shown, including safety agency certifications on labels, may vary based on the date manufactured. 3. Mechanical drawings and specifications are for reference only. 4. All specifications are measured at an ambient temperature of C, humidity<75%, nominal input voltage and at rated output load unless otherwise specified. 5. Aimtec may not have conducted destructive testing or chemical analysis on all internal components and chemicals at the time of publishing this document. CAS numbers and other limited information are considered proprietary and may not be available for release. 6. This product is not designed for use in critical life support systems, equipment used in hazardous environments, nuclear control systems or other such applications which necessitate specific safety and regulatory standards other the ones listed in this datasheet. 7. Warranty is in accordance with Aimtec s standard Terms of Sale available at www.aimtec.com. F 5e R9.G 4 of 4 North America only