MR-16 LED驱动器和用于脉冲LED冷却器供电的5V辅助
mr-16 led驱动器和用于脉冲led冷却器供电的5v辅助电源
abstract: this application note presents a reference design for a 4s1p mr-16 led driver that provides 750ma to a string of four white leds (wleds). the circuit operates from a 24v source and is based around the max16820 hysteretic led driver. also included is a max5033 24v-to-5v, 150ma switching power supply to power a nuventix® pulsating led cooler.
overviewthis reference design details a driver circuit using the max16820 hysteretic led driver for a 4-led mr-16 lamp with an associated power source (max5033) for a pulsed air cooler.
the following are the electrical input requirements and output capabilities.
vin: 24vdc ±5%
temperature: +80°c (max) ambient
vled configuration: 4 leds in series (16vdc, max), 750ma
auxiliary output power: 5v at 150ma (average), 300ma (peak)
the reference design is discussed in detail below, with analysis of the main circuit blocks and layout considerations.
figure 1. schematic of the driver design.
figure 2. photo of the pcb. the board was designed to fit directly into an mr-16 assembly.
figure 3. revised layout of the pcb (updated from the board in figure 2).
design analysisdesigned to fit directly into an mr-16 assembly, this reference design delivers 750ma to a string of 4 leds from a 24v power source. the max16820 provides hysteretic control and regulates the current through the inductor and the leds. meanwhile, the max5033 provides power to a pulsating cooler through the j2 connector. the cooler presents a sinusoidal load of 300ma peak and 150ma average to the power supply.
the r3 resistor is in the circuit to satisfy the stability requirements (with a ceramic output capacitor) of the max5033.
a provision was made for pwming, but not tested. the center pin of j1 was routed directly to the dim input of the max16820.
power-up procedure connect 4 leds in series to the led+ (anode) and led- (cathode) pins. attach a 300ma load to j2. attach a 24v, 1a power supply to j1. turn on the power supply. table 1. bill of materials (bom) designator component description footprint quantity
c1 nonpolarized capacitor 10µf, 50v, x7r 2220 1
c2 nonpolarized capacitor 470pf, 50v, cog 0402 1
c3 nonpolarized capacitor 1µf, 16v, x7r 0603 1
c4, c5 nonpolarized capacitors 0.1µf, 25v, x7r 0603 2
c6, c7 nonpolarized capacitors 10µf, 10v, x7r 1206 2
d1 schottky diode stps2l60a sma 1
d2 schottky diode rb160m-60 sod123f 1
j1 3 x 1 connector — 1.25mm 1
j2 2 x 1 connector — 100mil 1
l1 inductor 82µh, mss1038-823 10.2mm x 10mm 1
l2 inductor 390µh, mss1038-394 10.2mm x 10mm 1
q1 n-channel mosfet 2sk2857 sot89 1
r1 resistor 0.24ω, 1% 1206 1
r2 resistor 10kω, 1% 0603 1
r3 resistor 0.27ω, 5% 1206 1
r4 resistor 100kω, 1% 0603 1
r5 resistor 10kω, 1% 0603 1
u1 led driver max16820att 6-tdfn 1
u2 buck dc-dc converter max5033busa 8-so 1
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abstract: this application note presents a reference design for a 4s1p mr-16 led driver that provides 750ma to a string of four white leds (wleds). the circuit operates from a 24v source and is based around the max16820 hysteretic led driver. also included is a max5033 24v-to-5v, 150ma switching power supply to power a nuventix® pulsating led cooler.
overviewthis reference design details a driver circuit using the max16820 hysteretic led driver for a 4-led mr-16 lamp with an associated power source (max5033) for a pulsed air cooler.
the following are the electrical input requirements and output capabilities.
vin: 24vdc ±5%
temperature: +80°c (max) ambient
vled configuration: 4 leds in series (16vdc, max), 750ma
auxiliary output power: 5v at 150ma (average), 300ma (peak)
the reference design is discussed in detail below, with analysis of the main circuit blocks and layout considerations.
figure 1. schematic of the driver design.
figure 2. photo of the pcb. the board was designed to fit directly into an mr-16 assembly.
figure 3. revised layout of the pcb (updated from the board in figure 2).
design analysisdesigned to fit directly into an mr-16 assembly, this reference design delivers 750ma to a string of 4 leds from a 24v power source. the max16820 provides hysteretic control and regulates the current through the inductor and the leds. meanwhile, the max5033 provides power to a pulsating cooler through the j2 connector. the cooler presents a sinusoidal load of 300ma peak and 150ma average to the power supply.
the r3 resistor is in the circuit to satisfy the stability requirements (with a ceramic output capacitor) of the max5033.
a provision was made for pwming, but not tested. the center pin of j1 was routed directly to the dim input of the max16820.
power-up procedure connect 4 leds in series to the led+ (anode) and led- (cathode) pins. attach a 300ma load to j2. attach a 24v, 1a power supply to j1. turn on the power supply. table 1. bill of materials (bom) designator component description footprint quantity
c1 nonpolarized capacitor 10µf, 50v, x7r 2220 1
c2 nonpolarized capacitor 470pf, 50v, cog 0402 1
c3 nonpolarized capacitor 1µf, 16v, x7r 0603 1
c4, c5 nonpolarized capacitors 0.1µf, 25v, x7r 0603 2
c6, c7 nonpolarized capacitors 10µf, 10v, x7r 1206 2
d1 schottky diode stps2l60a sma 1
d2 schottky diode rb160m-60 sod123f 1
j1 3 x 1 connector — 1.25mm 1
j2 2 x 1 connector — 100mil 1
l1 inductor 82µh, mss1038-823 10.2mm x 10mm 1
l2 inductor 390µh, mss1038-394 10.2mm x 10mm 1
q1 n-channel mosfet 2sk2857 sot89 1
r1 resistor 0.24ω, 1% 1206 1
r2 resistor 10kω, 1% 0603 1
r3 resistor 0.27ω, 5% 1206 1
r4 resistor 100kω, 1% 0603 1
r5 resistor 10kω, 1% 0603 1
u1 led driver max16820att 6-tdfn 1
u2 buck dc-dc converter max5033busa 8-so 1
对于高价主板和低价主板，它们有什么区别
一款适合于智能家居使用的的智能镜面显示屏
FPGA的数字信号处理：重写FIR逻辑以满足时序要求
端到端自动驾驶到底是什么？
可穿戴创业：以色列的孵化器为何如此给力？
MR-16 LED驱动器和用于脉冲LED冷却器供电的5V辅助
适合中小型企业的智能网关都有哪些
诺基亚确认与蔡司终止合作 不再使用ZEISS镜头
如何用按键控制不同的LED流转模式？
针式打印机的兼容操作系统
对比热电偶和手持温度计 红外测温仪AR802B测量特性
安科瑞AEM电能计量表介绍
变频电机与工频电机的区别在哪里？
PCB设计完成后，为什么经常要拼版及拼版注意事项
央企华润集团旗下的微电子企业华润微产业布局再度领先
频程及滤波器的Q值计算
RLC子层的概述模型
知道这4条，升级iOS10.3才安心
SK海力士开发出业界最快的服务器内存模组MCR DIMM
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