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Microchip HV9805
230VAC Off-line LED Driver with Dimming and Short-Circuit Load Protection using the HV9805 Controller
Overview
| Topology | Boost Converter |
| Input voltage | 190-265 V |
| Output 1 | 435 V / 0.06 A |
| Output 2 | 435 V / 0.09 A |
| Output 3 | 435 V / 0.03 A |
| IC revision | AN2080 |
Description
The HV9805 driver integrated circuit (IC) is targeted at general LED lighting products, such as LED lamps and LED lighting fixtures with a maximum power rating of about 25W at 120VAC and 50W at 230VAC. A two-stage topology provides true constant current drive for the LED load while drawing mains power with high power factor. The first stage, a boundary conduction mode boost converter, transfers power from the AC line to a second stage linear current regulator with high power factor and high efficiency. The linear current regulator, arranged for operation with low overhead voltage, transfers power from the first stage to the LED load with true constant current (no ripple) and protectsthe LED load from the overvoltage that may pass from mains to the output of the first stage. The IC is particularly geared to drive a high voltage LED load. An LED load arranged as a high-voltage load is capable of offering cost advantages in terms of heat management and optics. The boost converter employs a cascode switch for high-speed switching and convenient generation of the VDD supply. The control device of the cascode switch is an integral part of the HV9805 and is rated at 700 mA peak. Current for powering the VDD supply is derived by means of an internal connection to the cascode switch.
Features
- 1st Stage with:
- Boundary Conduction Mode (BCM) boost with power factor correction
- High power factor (0.98 typical)
- High efficiency (90% typical)
- Simple VDD supply: no auxiliary winding required
- Boost converter cascode switch: internal switch rated at 700 mA peak
- Supports up to 25W at 120VAC
- Supports up to 50W at 230VAC
- 2nd Stage:
- Linear post-regulator with low overhead voltage
- Zero LED current and brightness ripple
- Provides true DC light and protects load from line voltage transients
- Output load open circuit protection
- High efficiency
- ±4% reference over temperature
Typical applications
- LED Lamps/ LED Lighting Fixtures/ Low Output Voltage Applications, SEPIC Topology
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IR(A) | ISAT(A) | RDC max.(mΩ) | fres(MHz) | IR(A) | L1(mH) | RDC max.(Ω) | VR(V (AC)) | VT(V (AC)) | Material | L(mm) | W(mm) | H(mm) | Mount | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-PD HV SMT Power Inductor (High Voltage), 2200 µH, 0.43 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD HV SMT Power Inductor (High Voltage) | Inductance2200 µH | Rated Current0.43 A | Saturation Current0.65 A | DC Resistance3700 mΩ | Self Resonant Frequency0.8 MHz | – | – | – | – | – | – | Length12 mm | Width12 mm | Height10.5 mm | MountSMT | ||||
 | WE-LF SMT Common Mode Power Line Choke, 6800 µH, 1.4 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-LF SMT Common Mode Power Line Choke | Inductance6800 µH | Rated Current1.4 A | – | DC Resistance300 mΩ | – | Rated Current1.4 A | Inductance [1]6.8 mH | DC Resistance [1]0.3 Ω | Rated Voltage250 V (AC) | Insulation Test Voltage1500 V (AC) | MaterialMnZn | Length23.3 mm | Width18.5 mm | Height11.5 mm | – |