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LD8105 Dataheets PDF



Part Number LD8105
Manufacturers Leadtrend
Logo Leadtrend
Description Constant Voltage and Constant Current Controller
Datasheet LD8105 DatasheetLD8105 Datasheet (PDF)

LD8105 5/29/2012 Constant Voltage and Constant Current Controller Rev. 00 General Description The LD8105 is built-in with a high-accuracy 1.2V voltage reference, two op-amps and a low-side current sensing circuit in a SOT-26 package. It provides a highly integrated solution for CV (constant voltage) and CC (constant current) dual control. The LD8105 is capable to operate under temperature ranging from -40°C to 105°C. Features  Internal Precision ±1% Voltage Reference  Secondary-side Constant.

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LD8105 5/29/2012 Constant Voltage and Constant Current Controller Rev. 00 General Description The LD8105 is built-in with a high-accuracy 1.2V voltage reference, two op-amps and a low-side current sensing circuit in a SOT-26 package. It provides a highly integrated solution for CV (constant voltage) and CC (constant current) dual control. The LD8105 is capable to operate under temperature ranging from -40°C to 105°C. Features  Internal Precision ±1% Voltage Reference  Secondary-side Constant Voltage and Constant Current Control  Low Quiescent consumption  Wide VCC operating range 3V to 38V  Max. 40V voltage rating  Low external component count  SOT-26 Package Applications  LED Lighting Typical Application IREF 1.21V VCC OUT 100mV ISEN LD8105 GND VSEN Fig. 1 Typical Application Circuit -1 Leadtrend Technology Corporation LD8105-DS-00 May 2012 1 www.leadtrend.com.tw DC output LD8105 VCC IREF 1.21V OUT ISEN 100mV LD8105 GND VSEN Fig. 2 Typical Application Circuit -2 DC output Pin Configuration SOT-26 (TOP VIEW) VCC OUT IREF 65 05 YWV pp 12 4 3 Y: W: PP : V05 : Year code (D: 2004, E: 2005…..) Week code Production code LD8105 ISEN GND VSEN Ordering Information Part number Package LD8105GL SOT-26 The LD8105 is Green Packaged. TOP MARK YWV/05 Shipping 3000 /tape & reel Leadtrend Technology Corporation LD8105-DS-00 May 2012 2 www.leadtrend.com.tw Pin Descriptions LD8105 PIN NAME FUNCTION 1 ISEN Current sense pin. The inverting input of the current loop op amp. 2 GND Ground. Voltage sense pin. It can sense the output voltage if connected to the mid-point 3 VSEN of the resistor divider. 4 IREF The non-inverting input of the current loop op amp. 5 OUT Common output pin of the two internal op amps. Supply voltage pin. It is necessary to locate a 0.1F bypass capacitor between 6 VCC VCC and GND. Block Diagram IREF 1.21V VCC OUT ISEN 100mV GND VSEN Leadtrend Technology Corporation LD8105-DS-00 May 2012 3 www.leadtrend.com.tw Absolute Maximum Ratings Supply Voltage, Vcc VSEN ISEN IREF OUT Maximum sink current Maximum Junction Temperature Operating Junction Temperature Operating Ambient Temperature Storage Temperature Range Package Thermal Resistance Power Dissipation (At Ambient Temperature = 85C) Lead temperature (Soldering, 10sec) ESD Voltage Protection, Human Body Model ESD Voltage Protection, Machine Model LD8105 -0.3 ~40V -0.3~6V -0.3~6V -0.6~6V -0.3~Vcc 20mA 125C -40C to 125C -40C to 85C -65C to 150C 250C/W 160mW 260C 2 KV 200 V Caution: Stresses beyond the ratings specified in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Recommended Operating Conditions Item Supply Voltage Vcc Min. 3 Max. 38 Unit V Leadtrend Technology Corporation LD8105-DS-00 May 2012 4 www.leadtrend.com.tw Electrical Characteristics (TA = +25C unless otherwise stated, VCC=15.0V) PARAMETER CONDITIONS Supply Voltage (Vcc Pin) Supply Voltage Quiescent Current ISEN = IREF = 0V, OUT = open Voltage Control Loop (VSEN PIN) Voltage loop reference voltage, VSEN Voltage Loop Input Bias Current Current Control Loop (IREF Pin) ISEN = IREF = 0V ISEN = IREF= 0V, (TA = -20C ~125C) VSEN = 1.18V~1.24V Current loop reference voltage, IREF Current Loop Input Bias Current Output (Output Pin) VSEN = 1.21V IREF= 90mV~110mV Output Low Level @2mA sink current LD8105 MIN TYP MAX UNITS 3 -- 38 V -- -- 150 μA 1.198 1.186 -- 1.210 --- 1.222 1.234 20 V V nA 97 100 103 mV -- -- 20 nA -- 200 400 mV Leadtrend Technology Corporation LD8105-DS-00 May 2012 5 www.leadtrend.com.tw Typical Performance Characteristics 96 Vcc=15V 91 Vcc=3V 86 81 121 105 89 73 LD8105 Vcc=3V Vcc=15V Low Output Voltage Level (V) Quiescent Current (A) 76 -40 -20 0 20 60 80 80 100 120 Temperature (C) Fig. 1 Quiescent Current vs. Temperature 1.23 1.22 Vcc=3V Vcc=15V 1.21 57 -40 -20 0 20 60 80 80 100 120 Temperature (C) Fig. 2 Low Output Voltage Level vs. Temperature 103 102 Vcc=3V Vcc=15V 101 Current Loop Reference (mV) Voltage Loop Reference (V) 1.20 100 1.19-40 -20 Fig. 3 0 20 60 80 80 100 120 Temperature (C) Voltage Loop Reference vs. Temperature 99 -40 -20 Fig. 4 0 20 60 80 80 100 120 Temperature (C) Current Loop Reference vs. Temperature Leadtrend Technology Corporation LD8105-DS-00 May 2012 6 www.leadtrend.com.tw Package Information SOT-26 LD8105 Symbol A B C D F H I J M θ Dimension in Millimeters Min Max 2.692 3.099 1.397 1.803 ------- 1.450 0.300 0.500 0.95 BSC. 0.080 0.254 0.050 0.150 2.600 3.000 0.300 0.600 0° 10° Dimensions in Inches Min Max 0.106 0.122 0.055 0.071 ------- 0.057 0.012 0.020 0.003 0.002 0.102 0.012 0° 0.010 0.006 0.118 0.024 10° Important Notice Leadtrend Technology Corp. reserves the ri.


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