Nothing Special   »   [go: up one dir, main page]
Scribd Logo
Upload

Welcome to Scribd!

  • 3 views

    Utc1869 Yw

    Uploaded by

    Norberto Cruz

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    Utc1869 Yw

    Uploaded by

    Norberto Cruz
    3 views7 pages

    Original Title

    UTC1869-YW

    Copyright

    © © All Rights Reserved

    Available Formats

    PDF, TXT or read online from Scribd

    Did you find this document useful?

    Is this content inappropriate?

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    3 views7 pages

    Utc1869 Yw

    Uploaded by

    Norberto Cruz

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 7

    UTC1869 LINEAR INTEGRATED CIRCUIT

    HIGH FREQUENCY PWM


    CONTROLLER

    DESCRIPTION
    The UTC1869 is a high frequency PWM controller integrates
    required functions for boost conversion in a small SOP-8
    package . A low 0.21V feedback voltage make the UTC1869
    be an ideal contoller for LED backlight supplies .
    SOP-8

    FEATURES
    * Voltage Mode PWM Controller
    * Low 0.21V reference Voltage
    * 180KHz Operation
    * Deadtime Control
    * Internal UVLO(Under Voltage Lock Out)
    * Limited Output Duty Cycle
    * Low Shutdown current
    * SOP-8 Package
    * Soft Setup

    ABSOLUTE MAXIMUM RATINGS


    (Unless otherwise noted ,all is over operating free-air temperature Range)
    Characteristic Value Unit
    Supply Voltage 7-40 V
    Input Voltage -0.3 Vcc+0.3 V
    Operating Ambit Temperature Range 0 70 °C
    Extreme Operating Ambient Temp -40 85 °C
    Operating Junction Temperature +150 °C
    Storage Temperature -55 150 °C

    RECOMMENDED OPERATING CONDITION


    Characteristic Value Unit
    Supply Voltage 36 V
    Operating Ambient Temperature 0 70 °C

    BLOCK DIAGRAM

    YOUWANG ELECTRONICS CO.LTD 2012.07.11 V1.6


    1
    UTC1869 LINEAR INTEGRATED CIRCUIT
    PIN CONFIGURATIONS

    PIN FUNCTIONS
    Pin No. Pin Name Function
    1 IN Sampling signal input
    2 FB Feedback PWM input
    3 DT Deadtime Control
    4 GND GND
    5 OUT PWM output
    6 VCC Power supply
    7 EA Enable
    8 Vref Internal 5V reference

    YOUWANG ELECTRONICS CO.LTD 2012.07.11 V1.6


    2
    UTC1869 LINEAR INTEGRATED CIRCUIT
    ELECTRICAL CHARACTERISTICS
    (Over recommended operating free-air temperature range,V CC=12V,Unless otherwise specified)
    Characteristic Test Conditions Min Typ Max Unit
    Reference Section
    Feedback voltage 0.21 V
    Output voltage Io=1mA 5 V
    Input regulation Vcc=7V to 36V 2 50 mV
    Output Regulation Io=1 to 10mA 1 15 mV
    Output Voltage change with ∆TA=MIN to MAX(note 2) 0.2 1 %
    Temperature
    Short-circuit output Current Vref=0 35 mA
    Characteristic Test Conditions Min Typ Max Unit
    Oscillator section
    Frequency 180 kHz
    Standard Deviation of Frequency 20 %
    Amplifier Section
    Input offset Voltage Vo(pin 2)=2.5V 2 10 mV
    Input offset Current Vo(pin 2)=2.5V 25 250 nA
    Input bias Current Vo(pin 2)=2.5V 0.2 1 µA
    Input Voltage Range Vcc=7V to 25 V -0.3 to V
    Vcc-2
    Open-Loop Voltage Amplification ∆Vo=3V, Vo=0.5V to 3.5V 70 95 dB
    Unity-Gain Bandwidth 800 kHz
    Rejection ratio Vcc=25V,TA=25°C 65 80 dB
    Output Section
    VOUT Low 0.1 0.3 V
    High Io= -200mA VCC-1.5 VCC-2.5 V
    Dead Time Control Section
    Maximum duty cycle,each output VI(pin 3)=0 85 %
    Input threshold Voltage(pin3) Zero duty Cycle 3 3.3 V
    Maximum duty cycle 0 V
    Grounding resistance 80 k
    PWM comparator Section
    Input Threshold Voltage(pin 2) Zero Duty cycle 0.1 0.2 V
    Input sink current (pin 2) Vpin 2= 0.7V 0.3 0.7 mA
    Total Device
    Standby supply current Vcc=12V All Inputs and outputs open 6 10 mA
    Vcc=25V EA High 9 15 mA
    EA Low 0.1 mA
    Under Voltage Look Out
    Upper threshold voltage Ta=2 6.2 6.4 6.6 V
    Switching Characteristics,Ta=25°C
    Output Voltage rise time 100 200 ns
    Output Voltage fall time 100 200 ns
    EA Section
    Enable Low 0 0.2 V
    High 2 5 V
    EA Grounding resistance 20 k

    note 1:All typical Values except for temperature coefficient are at Ta=25°C.
    note 2:For conditions shown as MIN or MAX, use appropriate value under recommended operating conditions.
    note 3:Duration of the short-circuit should not exceed one second.

    YOUWANG ELECTRONICS CO.LTD 2012.07.11 V1.6


    3
    UTC1869 LINEAR INTEGRATED CIRCUIT

    TYPICAL APPLICATION CIRCUI

    YOUWANG ELECTRONICS CO.LTD 2012.07.11 V1.6


    4
    UTC1869 LINEAR INTEGRATED CIRCUIT

    TYPICAL APPLICATION CIRCUI

    YOUWANG ELECTRONICS CO.LTD 2012.07.11 V1.6


    5
    UTC1869 LINEAR INTEGRATED CIRCUIT

    TYPICAL PERFORMANCE CHARACTERISTICS


    VIN=12V 14 LEDs in series, 200mA / string, unless otherwise noted.

    YOUWANG ELECTRONICS CO.LTD 2012.07.11 V1.6


    6
    UTC1869 LINEAR INTEGRATED CIRCUIT

    PACKAGE DIMENSIONS
    SOP-8-225-1.27 Unit: mm

    YOUWANG ELECTRONICS CO.LTD 2012.07.11 V1.6


    7

    You might also like