HVLED805TR STMicroelectronics, HVLED805TR Datasheet
HVLED805TR
Specifications of HVLED805TR
Available stocks
Related parts for HVLED805TR
HVLED805TR Summary of contents
Page 1
... FEEDFORWARD DE MAG LOGIC DMG Rdmg 3.3V Vref Rfb CONSTANT VOLTAGE REGULATION COMP October 2010 Off-line LED driver with primary-sensing Table 1. Order codes HVLED805 HVLED805TR HV start-up & SUPPLY LOGIC Vref LOGIC DRIVING CONSTANT LOGIC CURRENT REGULATION OCP Vc ILED GND Rcomp CLED Cc omp ...
Page 2
Contents Contents 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
Page 3
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 ...
Page 4
Maximum ratings 2 Maximum ratings Table 2. Absolute maximum ratings Symbol Pin V 1,2, 13-16 Drain-to-source (ground) voltage DS I 1,2, 13-16 Drain current D E 1,2, 13-16 Single pulse avalanche energy ( DMG ...
Page 5
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 ...
Page 6
Electrical characteristics Table 4. Electrical characteristics (continued) Symbol Parameter V Upper clamp voltage DMGH V Lower clamp voltage DMGL V Arming voltage DMGA V Triggering voltage DMGT I Min. source current during MOSFET ON-time DMGON T Trigger blanking time after ...
Page 7
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. ...
Page 8
Pin connection Table 5. Pin functions N. Name Power section source and input to the PWM comparator. The current flowing in the MOSFET is sensed through a resistor connected between the pin and GND. The resulting voltage is compared with ...
Page 9
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 ...
Page 10
Pin connection Figure 5. 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 ...
Page 11
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 ...
Page 12
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 ...
Page 13
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 ...
Page 14
Application information Most of this current will charge the bypass capacitor connected between the Vcc pin and ground and make its voltage rise linearly. As the Vcc voltage reaches the start-up threshold (13 V typ.) the chip starts operating, the ...
Page 15
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 ...
Page 16
Application information After the first few cycles initiated by the starter, as the voltage developed across the auxiliary winding becomes large enough to arm the DMG circuit, MOSFET’s turn-on will start to be locked to transformer demagnetization, hence setting up ...
Page 17
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 ...
Page 18
Application information 5.5 Constant current operation Figure 15 presents the principle used for controlling the average output current of the flyback converter. The output voltage of the auxiliary winding is used by the demagnetization block to generate the control signal ...
Page 19
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 ...
Page 20
Application information Figure 16. Constant current operation: Switching cycle waveforms 5.6 Voltage feedforward block The current control structure uses the voltage V (7). Actually, the CC comparator will be affected by an internal propagation delay Td, which will switch off ...
Page 21
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” ...
Page 22
Application information This offset is proportional to V according to the formula: Equation 13 Finally, the R dmg Equation 14 In this case the peak drain current does not depend on input voltage anymore. One more consideration concerns the R ...
Page 23
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 ...
Page 24
Application information before the V capacitor is charged again and the device restarted. Ultimately, this will CC result in a low-frequency intermittent operation (Hiccup-mode operation), with very low stress on the power circuit. This special condition is illustrated in the ...
Page 25
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 ...
Page 26
Package mechanical data 6 Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ® ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product status are available ...
Page 27
HVLED805 Figure 21. Package dimensions Doc ID 18077 Rev 1 Package mechanical data 27/29 ...
Page 28
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 ...
Page 29
... 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. ...