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LD7860 Dataheets PDF



Part Number LD7860
Manufacturers Leadtrend
Logo Leadtrend
Description 1A High-Brightness LED Driver
Datasheet LD7860 DatasheetLD7860 Datasheet (PDF)

LD7860 12/30/2009 1A High-Brightness LED Driver with Integrated NMOS Switch REV:00 General Description The LD7860 is a controller for step-down converters, operating in continuous conduction mode and ideally for driving high brightness of power LEDs. The device operates with inputs from 6V to 30V and utilizes an external high-side current sense resistor to set the normal average output current of up to 1A. Depending on the selection of input voltage and external components, it can drive up to 7.

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LD7860 12/30/2009 1A High-Brightness LED Driver with Integrated NMOS Switch REV:00 General Description The LD7860 is a controller for step-down converters, operating in continuous conduction mode and ideally for driving high brightness of power LEDs. The device operates with inputs from 6V to 30V and utilizes an external high-side current sense resistor to set the normal average output current of up to 1A. Depending on the selection of input voltage and external components, it can drive up to 7pcs of WLEDs (VF=3.5V). Output current can be adjusted below the set value, by applying an external analog or PWM control signal to DIM pin. The device can operate with the switching frequency of up to 1MHz, making it ideal for the applications requiring small footprint and low value external inductors. Some additional features include under-voltage lockout, over current protection and thermal shutdown. Features z Wide input voltage range: 6V to 30V z Integrated with 30V NMOS switch z Up to 1A output current z Hysteretic Control z Output current accuracy for ±5% (typ.) z Up to 1MHz switching frequency z Brightness control using analog or PWM signal z High efficiency z Over current protection z Over temperature protection z Inherent open-circuit LED protection z Output shutdown Applications z MR16 or LED bulbs z Architectural, Ambient and Low-voltage industrial lightings z LED replacement for Low-voltage halogen z General lighting applications z Indicators or emergency lighting z LED back-up lighting Leadtrend Technology Corporation LD7860-DS-00 December 2009 1 www.leadtrend.com.tw Typical Application LD7860 Fig. 1 Typical application circuit Pin Configuration MSOP-8 (TOP VIEW) 8 76 5 78 60G K YYWWPP GND NC DIM NC TSOT23-5 (TOP VIEW) VCC CS 5 60 YWS PP 12 4 3 NC LX VCC CS 1 23 4 LX GN D DIM S 60: Y, YY: W, WW: P, PP: LD78 60 Year code Week code Production code Ordering Information Part number Package TOP MARK LD7860 GL TSOT23-5 LD7860 GK MSOP-8 LD7860 GJ SOT89-5 The LD7860 is Green Packaged. YWS/60 7860GK 7860GJ SOT89-5 (TOP VIEW) CS VCC 5 7 860G J YYWWPP 12 4 3 DIM GND LX Shipping 3000 /tape & reel 2500 /tape & reel 1000 /tape & reel Leadtrend Technology Corporation LD7860-DS-00 December 2009 2 www.leadtrend.com.tw Pin Descriptions: MSOP-8 PIN 1 2 NAME NC LX 3 VCC 4 CS 5 NC 6 DIM 7 NC 8 GND LD7860 FUNCTION No connection. Drain of NMOS switch Input voltage (from 6V to 30V). Bypass this pin with a 4.7μF of ceramic capacitor or larger one to GND. Connect a current sense resistor, RS between this pin and VCC pin to set average LED current ILEDAVG(A)=0.1(V)/RS(Ω) with DIM pin floating. No connection. z Remain floating during normal operation. (VDIM=5V) z Dimming can be accomplished by analog or by PWM control, depending on the desired applications. z If VDIM is below 0.35V, IC will be disabled. z Connect a capacitor from it to GND to set the soft-start time. Connect a current sense resistor between it and VCC pin to set average LED current ILEDAVG(A)=0.1(V)/RS(Ω) with DIM pin floating. IC GND. TSOT23-5 PIN 1 2 3 4 5 NAME LX GND DIM CS VCC FUNCTION Drain of NMOS switch IC GND. z Remain floating during normal operation. (VDIM=5V) z Dimming can be accomplished by analog or by PWM control, depending on the desired applications. z If VDIM is below 0.35V, IC will be disabled. z Connect a capacitor from it to GND to set the soft-start time. Connect a current sense resistor between it and VCC pin to set average LED current ILEDAVG(A)=0.1(V)/RS(Ω) with DIM pin floating. Input voltage (from 6V to 30V). Bypass this pin with a 4.7μF of ceramic capacitor or larger one to GND. Leadtrend Technology Corporation LD7860-DS-00 December 2009 3 www.leadtrend.com.tw SOT89-5 PIN 1 2 3 4 5 LD7860 NAME DIM GND LX VCC CS FUNCTION z Remain floating during normal operation. (VDIM=5V) z Dimming can be accomplished by analog or by PWM control, depending on the desired applications. z If VDIM is below 0.35V, IC will be disabled. z Connect a capacitor from it to GND to set the soft-start time. IC GND. Drain of NMOS switch Input voltage (from 6V to 30V). Bypass this pin with a 4.7μF of ceramic capacitor or larger one to GND. Connect a current sense resistor between it and VCC pin to set average LED current ILEDAVG(A)=0.1(V)/RS(Ω) with DIM pin floating. Block Diagram Leadtrend Technology Corporation LD7860-DS-00 December 2009 4 www.leadtrend.com.tw LD7860 Absolute Maximum Ratings VCC and CS Pin to GND LX Pin to GND LX Current DIM Pin to GND Power dissipation TSOT-25@Ta=25°C Package Thermal Resistance TSOT-25 Power dissipation SOT89-5@Ta=25°C Package Thermal Resistance SOT89-5 Power dissipation MSOP-8@Ta=25°C Package Thermal Resistance MSOP-8 Operating Ambient Temperature Range Storage Temperature Range Maximum Operating Junction Temperature Lead Temperature (Soldering, 10sec) ESD Level (Human Body Model) ESD Level (Machine Model) -0.3V~32V (33V for 0.5s) -0.3V~33V (34V for 0.5s) 3.5A -0.3V~6V 45.


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