HVLED805 STMicroelectronics, HVLED805 Datasheet
HVLED805
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HVLED805 Summary of contents
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... Order codes HVLED805 HVLED805TR HV start-up & SUPPLY LOGIC Vref LOGIC DRIVING CONSTANT LOGIC CURRENT REGULATION OCP Vc ILED GND Rcomp CLED Cc omp Doc ID 18077 Rev 1 HVLED805 SO16N Device summary Package Packaging SO16N Tape and reel Vin DRAIN LED 1V SOURCE Rsens e Tube ... 1/29 www.st.com 29 ...
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... Constant voltage operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 5.5 Constant current operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5.6 Voltage feedforward block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 5.7 Burst-mode operation at no load or very light load . . . . . . . . . . . . . . . . . . 22 5.8 Soft-start and starter block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 5.9 Hiccup mode OCP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 5.10 Layout recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 2/29 Doc ID 18077 Rev 1 HVLED805 ...
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... HVLED805 1 Description The HVLED805 is a high-voltage primary switcher intended for operating directly from the rectified mains with minimum external parts to provide an efficient, compact and cost effective solution for LED driving. It combines a high-performance low-voltage PWM controller chip and an 800V, avalanche-rugged power MOSFET, in the same package. ...
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... Zero current detector current Analog input Power dissipation @T = 50°C A Junction temperature range Storage temperature Parameter Doc ID 18077 Rev 1 Value -1 to 800 1 = 25° 0.7A Self limiting ±2 -0.3 to 3.6 0.9 -40 to 150 -55 to 150 Max. value 10 110 HVLED805 Unit °C °C Unit °C/W ...
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... HVLED805 3 Electrical characteristics T = -25 to 125 °C, Vcc=14 V; unless otherwise specified. J Table 4. Electrical characteristics Symbol Parameter Power section V Drain-source breakdown (BR)DSS I Off state drain current DSS R Drain-source ON-state resistance DS(on) C Effective (energy-related) output capacitance (See oss High-voltage start-up generator V Min. drain start voltage ...
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... COMP Open loop V = 2.3V 1.65V DMG COMP V = 2.7V 1.65V DMG COMP V = 2.3V DMG V = 2.7V DMG ( COMP COMPL (1) dVcs/dt = 200 mV/µs (1) Doc ID 18077 Rev 1 HVLED805 Min. Typ. Max. Unit 3.0 3.3 3.6 V -90 -60 -30 mV 100 110 120 -25 -50 -75 µA 6 µs 30 Ω 45 2.45 2.51 2. ...
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... HVLED805 4 Pin connection Figure 2. Pin connection (top view) Note: The copper area for heat dissipation has to be designed under the drain pins SOURCE 1 SOURCE 2 VCC 3 GND 4 ILED 5 DMG 6 COMP 7 N.A. 8 Doc ID 18077 Rev 1 Pin connection 16 DRAIN 15 DRAIN DRAIN 14 DRAIN 13 N.C. 12 N.A. ...
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... Not internally connected. Provision for clearance on the PCB to meet safety requirements. Drain connection of the internal power section. The internal high-voltage start-up generator DRAIN sinks current from this pin as well. Pins connected to the internal metal frame to facilitate heat dissipation. 8/29 Function Doc ID 18077 Rev 1 HVLED805 sunk/sourced DMG ...
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... HVLED805 Figure 3. C OSS Figure 4. Off state drain and source current test circuit 2. The measured I Note: DSS µA typ. @ 750 V) and the effective MOSFET’s off state drain current output capacitance variation C (pF) OSS 500 400 300 200 100 ( CUR RE NT ...
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... Start-up current test circuit D MG Figure 6. Quiescent current test circuit 10/29 Icc sta rt-u p 2.5V CUR RE NT CON TR OL COM . OMP ILE 0 Iq_meas - 3.3kΩ Doc ID 18077 Rev 1 OUR AIN C UR REN T C ONT URC ⋅ μ -100 A HVLED805 0 .2V ...
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... HVLED805 Figure 7. Operating supply current test circuit 0kHz - Note: The circuit across the DMG pin is used for switch-on synchronization Figure 8. Quiescent current during fault test circuit 2 (fa ult) 2. COM Doc ID 18077 Rev 1 Pin connection + 1 . Icc V CC DRA IN CU RRE NT CO NTR OL ...
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... Application information 5 Application information The HVLED805 is an off-line all-primary sensing switching regulator, specific for offline LED drivers based on quasi-resonant ZVS (zero voltage switching at switch turn-on) flyback topology. Depending on converter’s load condition, the device is able to work in different modes (Figure 9 for constant voltage operation): 1 ...
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... HVLED805 5.1 Power section and gate driver The power section guarantees safe avalanche operation within the specified energy rating as well as high dv/dt capability. The Power MOSFET has a V(BR)DSS of 800V min. and Ω. typical R DSon The gate driver of the power MOSFET is designed to supply a controlled gate current during both turn-on and turn-off in order to minimize common mode EMI ...
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... DRAIN DRAIN I I charge charge 5.5 mA 5.5 mA Power-on Power-on 14/29 (10.5V typ.), during each MOSFET’s off-time the HV current restart Normal operation Normal operation CV mode CV mode Doc ID 18077 Rev 1 HVLED805 CCOn CCrestart Normal operation Normal operation Power-off Power-off CC mode CC mode ...
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... HVLED805 5.3 Secondary side demagnetization detection and triggering block The demagnetization detection (DMG) and Triggering blocks switch on the power MOSFET if a negative-going edge falling below applied to the DMG pin so, the triggering block must be previously armed by a positive-going edge exceeding 100 mV. ...
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... MOSFET will be turned BLANK has elapsed, it will be ignored and only the first negative- BLANK will turn-on the MOSFET. In this way one or more drain ringing BLANK Figure . BLANK osc < in'' in' Doc ID 18077 Rev 1 HVLED805 13) and the switching frequency will osc < in''' in'' t ...
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... HVLED805 Figure 14. Voltage control principle: internal schematic Rdmg Aux Due to the parasitic wires resistance, the auxiliary voltage is representative of the output just when the secondary current becomes zero. For this purpose, the signal on DMG pin is sampled-and-held at the end of transformer’s demagnetization to get an accurate image of the output voltage and it is compared with the error amplifier internal reference. During the MOSFET’ ...
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... C ⎛ ⋅ − + ⎜ CLED ONSEC CLED ⎝ ⋅ CLED T and is internally defined. LED Doc ID 18077 Rev 1 can be considered as a constant. C CLED ⎞ ⎟ ⎠ the conduction time of the secondary : P ⎞ V − ⋅ ⎟ ONSEC ⎠ ONSEC HVLED805 is can also S ...
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... HVLED805 Equation 6 Combining (2), (3) (5) and (6): Equation 7 This formula shows that the average output current does not depend anymore on the input or the output voltage, neither on transformer inductance values. The external parameters defining the output current are the transformer ratio n and the sense resistor R Figure 15 ...
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... This current overshoot will be equal to: Equation 8 Will introduce an error on the calculated CC setpoint, depending on the input voltage. The HVLED805 implements a Line Feedforward function, which solves the issue by introducing an input voltage dependent offset on the current sense signal, in order to adjust the cycle-by-cycle current limitation. ...
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... HVLED805 Figure 17. Feedforward compensation: internal schematic DMG Rdmg Rfb Aux During MOSFET’s ON-time the current sourced from DMG pin is mirrored inside the “ Feedforward Logic ” block in order to provide a feedforward current, I Such “feedforward current” is proportional to the input voltage according to the formula: Equation 9 Where m is the primary-to-auxiliary turns ratio ...
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... I DMG , the brownout function is activated and the IC is shut-down. threshold, the device restarts switching, otherwise it stays COMPL Figure 19 along with the others previously described, is noise-free Doc ID 18077 Rev 1 ⋅ ⋅ dmg ⋅ ⋅ SENSE HVLED805 (-50 DMGON =500 START ...
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... HVLED805 Figure 18. Load-dependent operating modes: timing diagrams COMP V COMPL I DS Normal-mode 5.8 Soft-start and starter block The soft start feature is automatically implemented by the constant current block, as the primary peak current will be limited from the voltage on the C During start-up, as the output voltage is zero, the IC will start in CC mode with no high peak current operations ...
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... Layout recommendations A proper printed circuit board layout is essential for correct operation of any switch-mode converter and this is true for the HVLED805 as well. Careful component placing, correct traces routing, appropriate traces widths and compliance with isolation distances are the major issues. In particular: ● ...
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... HVLED805 Figure 20. Suggested routing for converter ACIN ACIN DRAIN VDD HVLED805 DMG COMP GND ILED SOURCE Doc ID 18077 Rev 1 Application information LED ... 25/29 ...
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... Doc ID 18077 Rev 1 inch Min Typ 0.004 0.014 0.007 0.020 (typ.) 0.386 0.228 0.050 0.350 0.150 0.181 0.150 8 °(max.) HVLED805 ® Max 0.069 0.009 0.063 0.018 0.010 0.394 0.244 0.157 0.208 0.050 0.024 ...
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... HVLED805 Figure 21. Package dimensions Doc ID 18077 Rev 1 Package mechanical data 27/29 ...
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... Revision history 7 Revision history Table 7. Document revision history Date 14-Oct-2010 28/29 Revision 1 Initial release Doc ID 18077 Rev 1 HVLED805 Changes ...
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... HVLED805 Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. ...