LY1046_Datasheet

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Description Power Supply Loop Compensation Ground The voltage feedback from auxiliary winding. Connected to resistor divider from auxiliary winding reflecting output voltage. Current sense input. HV MOSFET Source HV MOSFET Drain
Strong Link Electronics
LY-DOC1046 REV:1.1 Mar..2012
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High Precision Off-line Primary-Side PWM Power Switch
LY1046
Marking Information
Shen Zhen Strong Link Electronics
High Precision Off-line Primary-Side PWM Power Switch
GENERAL DESCRIPTION
LY1046 is a primary side regulation off-line LED lighting controller which can achieve accurate LED current. It significantly simplifies LED lighting system design by eliminating the secondary side feedback circuitry. Proprietary Constant Voltage (CV) and Constant Current (CC) control is integrated as shown in the figure below. The LED current (CC control) can be adjusted externally by the resistor Rs at SOURCE pin. Device operates in PFM in CC mode as well at large load condition and it operates in PWM with frequency reduction at light/medium load. LY1046 offers comprehensive protection coverage with auto-recovery features including Cycle-by-Cycle current limiting, VDD OVP, VDD clamp and UVLO. Excellent EMI performance is achieved with On-Bright proprietary frequency shuffling technique. LY1046 is offered in DIP8 package.
(TA = 25℃, VDD=VDDG=16V, if not otherwise noted) Symbol Parameter Test Conditions Supply Voltage (VDD) Section I DD ST I DD op UVLO(ON) UVLO(OFF) VDD_clamp OVP Startup Current Operation Current VDD Under Voltage Lockout Enter VDD Under Voltage Lockout Exit Over voltage protection Threshold LEB time Over current threshold OCP Propagation delay Input Impedance Soft start time IC Maximum frequency System Nominal switch frequency INV=0V, Comp=5V Frequency shuffling range Reference voltage for EA DC gain of EA MOSFET Drain-Source Breakdown Voltage On Resistance Static, Id=1.0A 55 50 17 60 50 14 +/-6 1.96 2 60 2.04 65 VDD=13V Operation supply current INV=2V, CS=0V, VDD=VDDG=20V VDD falling VDD rising Ramp VDD until gate shut down 8.6 5 2 9.4 20 3 uA mA Min Typ Max Unit
Strong Link Electronics
LY-DOC1046 REV:1.1 Mar..2012
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High Precision Off-line Primary-Side PWM Power Switch
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LY1046TLeabharlann RMINAL ASSIGNMENTS
Pin Num 1 2 3 4 5 6 7,8 Pin Name VDD COMP GND INV CS SOURCE DRAIN I/O P I P I I I O
Frequency Section
Power MOSFET Section BVdss Rdson 600 4.4 V Ώ
Note:
1. Freq_Max indicates IC internal maximum clock frequency. In system application, the maximum operation frequency of 60KHz nominal occurs at maximum output power or the transition point from CV to CC.
FEATURES
High Precise Constant Current Regulation at Universal AC input Primary-side Sensing and Regulation Without TL431 and Opto-coupler Programmable CC Regulation Adjustable Constant Current and Output Power Setting Built-in Secondary Constant Current Control with Primary Side Feedback Built-in Adaptive Current Peak Regulation Built-in Primary winding inductance compensation Power on Soft-start Built-in Leading Edge Blanking (LEB) Cycle-by-Cycle Current Limiting VDD Under Voltage Lockout with Hysteresis (UVLO) VDD OVP VDD Clamp
APPLICATIONS
Low Power AC/DC offline SMPS for LED applications
Fig.1. Typical CC/CV Curve
.
TYPICAL APPLICATION
LY1046
Strong Link Electronics
LY-DOC1046 REV:1.1 Mar..2012
Strong Link Electronics
LY-DOC1046 REV:1.1 Mar..2012
4/9
LY1046
High Precision Off-line Primary-Side PWM Power Switch
ELECTRICAL CHARACTERISTICS
1/9
High Precision Off-line Primary-Side PWM Power Switch
LY1046
GENERAL INFORMATION
Pin Configuration The pin map is shown as below for DIP8.
Package Dissipation Rating Package RθJA (℃/W) DIP8 75 Absolute Maximum Ratings Parameter Drain Voltage(off state) VDD Voltage VDD Zener Clamp Continuous Current COMP Voltage CS Input Voltage INV Input Voltage Min/Max Operating Junction Temperature TJ Min/Max Storage Temperature Tstg Lead Temperature (Soldering, 10secs) Value -0.3 to BVdss -0.3 to VDD_clamp 10 mA -0.3 to 7V -0.3 to 7V -0.3 to 7V -40 to 150 ℃ -55 to 150 ℃ 260 ℃
VDD
1
8
DRAIN
COMP
2
7
DRAIN
GND
3
6
SOURCE
INV
4
5
CS
Ordering Information Part Number Description LY1046 DIP8, Pb-free, Tube