HV9931LG-G

HV9931 Unity Power Factor LED Lamp Driver Features General Description • • • • • • • • • The HV9931 is a fixed-frequency PWM controller IC designed to control an LED lamp driver using a single-stage PFC buck-boost-buck topology. It can achieve a unity power factor and a very high step-down ratio that enables driving a single high-brightness LED from 85 VAC to 264 VAC input without a power transformer. This topology allows reducing the filter capacitors and using non-electrolytic capacitors to improve reliability. The HV9931 uses open-loop peak current control to regulate both input and output currents. This control technique eliminates the need for loop compensation, limits the input inrush current, and is inherently protected from Input Undervoltage condition. Constant Output Current LED Driver Large Step-Down Ratio Unity Power Factor Low-Input Current Harmonic Distortion Fixed-Frequency or Fixed Off-Time Operation Internal 450V Linear Regulator Input and Output Current Sensing Input Current Limit Enable Pulse-Width Modulation (PWM) Dimming and Phase Dimming Applications • • • • Offline LED Lamps and Fixtures Street Lamps Traffic Signals Decorative Lighting Capacitive isolation protects the LED Lamp from failure of the switching MOSFET. The HV9931 provides a low-frequency PWM dimming input that accepts an external control signal with a duty ratio of 0% to 100% and a frequency of up to a few kilohertz. The PWM dimming capability enables HV9931 phase control solutions that can work with standard wall dimmers. Package Type 8-lead SOIC (Top view) VIN 1 8 RT CS1 2 7 CS2 GND 3 6 VDD GATE 4 5 PWMD See Table 2-1 for pin information.  2020 Microchip Technology Inc. DS20005733A-page 1 HV9931 Functional Block Diagram VIN Regulator VDD 7.5V Osc CS1 Leading Edge Blanking RT S R Q GATE CS2 GND PWMD HV9931 DS20005733A-page 2  2020 Microchip Technology Inc. HV9931 Typical Application Circuit VIN D4 L1 C1 D1 L2 D2 - ~AC ~AC D3 Q1 CIN VO + RS2 RS1 RCS2 RCS1 RREF1 1 VIN RT 4 GATE 2 CS1 CS2 7 3 GND VDD 6 PWMD HV9931  2020 Microchip Technology Inc. 8 RT RREF2 5 C2 DS20005733A-page 3 HV9931 1.0 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings† VIN to GND ..............................................................................................................................................–0.5V to +470V VDD to GND............................................................................................................................................–0.3V to +13.5V CS1, CS2, PWMD, GATE, RT to GND............................................................................................ –0.3V to VDD + 0.3V Junction Temperature, TJ .................................................................................................................... –40°C to +150°C Storage Temperature, TS ..................................................................................................................... –65°C to +150°C Continuous Power Dissipation (TA = +25°C): 8-lead SOIC ............................................................................................................................................ 650 mW † Notice: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only, and functional operation of the device at those or any other conditions above those indicated in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS Electrical Specifications: Specifications are at TA = 25°C. VIN = 12V unless otherwise noted. Parameter Sym. Min. Typ. Max. Unit Conditions INPUT VINDC 8 — 450 Shutdown Mode Supply Current IINSD — 0.5 1 VDD 7.12 7.5 7.88 V VIN = 8V, IDD(EXT) = 0 mA, CGATE = 500 pF, RT = 226 kΩ VDD Line Regulation ∆VDD,line 0 — 1 V VIN = 8V to 450V, IDD(ext) = 0 mA, CGATE = 500 pF, RT = 226 kΩ VDD Undervoltage Lockout Upper Threshold VUVLOR 6.45 6.7 6.95 V VDD rising VDD Undervoltage Lockout Hysteresis ∆VUVLO — 500 — mV PWMD Input Low Voltage VPWMD(LO) — — 0.80 V PWMD Input High Voltage VPWMD(HI) 2 — — V VIN = 8V to 450V (Note 1) RPWMD 50 100 150 kΩ VPWMD = 5V GATE Output High Voltage VGATE(HI) VDD–0.3 — VDD V IGATE = 10 mA, VDD = 7.5V, VIN open (Note 1) GATE Output Low Voltage VGATE(LO) 0 — 0.3 V IGATE = –10 mA, VDD = 7.5V, VIN open (Note 1) GATE Output Rise Time TRISE — 30 50 ns CGATE = 500 pF, VDD = 7.5V, VIN = open GATE Output Fall Time TFALL — 30 50 ns CGATE = 500 pF, VDD = 7.5V, VIN = open INTERNAL REGULATOR Internally Regulated Voltage V DC input voltage (Note 1) Input DC Supply Voltage Range mA PWMD connected to GND (Note 1) PWM DIMMING PWMD Pull-Down Resistance GATE DRIVER VIN = 8V to 450V (Note 1) Delay from CS Trip to GATE TDELAY — 150 300 ns VCS1, VCS2 = –100 mV Blanking Delay TBLANK 150 215 280 ns VCS1, VCS2 = –100 mV FOSC 80 100 120 OSCILLATOR Oscillator Frequency kHz RT = 226 kΩ Note 1: Specifications apply over the full operating ambient temperature range of –40ºC < TA < +85ºC. DS20005733A-page 4  2020 Microchip Technology Inc. HV9931 ELECTRICAL CHARACTERISTICS (CONTINUED) Electrical Specifications: Specifications are at TA = 25°C. VIN = 12V unless otherwise noted. Parameter Sym. Min. Typ. Max. Unit Conditions INPUT AND OUTPUT CURRENT SENSE COMPARATORS Comparator Input Offset Voltage VOFFSET1 VOFFSET2 –15 — 15 mV Note 1 Note 1: Specifications apply over the full operating ambient temperature range of –40ºC < TA < +85ºC. TEMPERATURE SPECIFICATIONS Parameter Sym. Min. Typ. Max. Unit Operating Ambient Temperature TA –40 — +85 °C Maximum Junction Temperature TJ(ABSMAX) — — +150 °C TS –65 — +150 °C JA — +101 — °C/W Conditions TEMPERATURE RANGE Storage Temperature PACKAGE THERMAL RESISTANCE 8-lead SOIC Switching Timing Waveforms VDD GATE 0 t 0 t iL2 iL1 0  2020 Microchip Technology Inc. t DS20005733A-page 5 HV9931 2.0 PIN DESCRIPTION The details on the pins of HV9931 are listed in Table 2-1. Refer to Package Type for the location of the pins. TABLE 2-1: PIN FUNCTION TABLE Pin Number Pin Name 1 VIN This pin is the input of a high-voltage regulator. 2 CS1 This pin is used to sense the input current of the converter. It is the inverting input of the internal comparator. 3 GND This is the ground return for all the internal circuitry. This pin must be electrically connected to the ground of the power train. 4 GATE This pin is the output of the gate driver for an external N-channel power MOSFET. 5 PWMD When this pin is pulled to GND, switching of the HV9931 is disabled. When the PWMD pin is released or the external TTL high level is applied to it, switching will resume.This feature is provided for applications that require PWM dimming of the LED lamp. 6 VDD This is a power supply pin for all internal circuits. It must be bypassed with a low-ESR capacitor to GND. 7 CS2 This pin is used to sense the output current of the converter. It is the inverting input of the internal comparator. 8 RT Oscillator control. A resistor connected between this pin and GND sets the switching frequency. A resistor connected between this pin and the GATE pin sets the switching off-time. DS20005733A-page 6 Description  2020 Microchip Technology Inc. HV9931 3.0 DETAILED DESCRIPTION 3.1 Power Topology The HV9931 is optimized to drive Microchip’s proprietary single-stage, single-switch, non-isolated topology, cascading an input power factor correction (PFC) buck-boost stage and an output buck converter power stage. (Refer to Typical Application Circuit.) This power converter topology offers numerous advantages useful for driving high-brightness light-emitting diodes (HB LED). These advantages include unity power factor, low harmonic distortion of the input AC line current, and low output current ripple. The output load is decoupled from the input voltage with a capacitor, making the driver inherently failure-safe for the output load. The power converter topology also permits reducing the size of the filter capacitor needed, enabling the use of non-electrolytic capacitors. This feature greatly improves the reliability of the overall solution. The HV9931 is a Peak Current-mode controller that is specifically designed to drive a constant-current buck-boost-buck power converter. This patented control scheme features two identical current sense comparators for detecting negative current signal levels. One of the comparators regulates the output LED current, while the other is used for sensing the input inductor current. The second comparator is mainly responsible for the converter start-up. The control scheme inherently features low inrush current and input undervoltage protection. The HV9931 can operate with programmable constant frequency or Constant Off-time Operating mode. In many cases, the Constant Off-time Operating mode is preferred because it improves line regulation of the output current, reduces voltage stress of the power components, and simplifies regulatory EMI compliance. (See application note, AN-H52 HV9931 Unity Power Factor LED Lamp Driver.) 3.2 Input Voltage Regulator The HV9931 can be powered directly from its VIN pin that can take a voltage from 8V to 450V. When voltage is applied to the VIN pin, the HV9931 attempts at regulating a constant 7.5V (typical) at the VDD pin. The VDD voltage can be also used as a voltage reference for the current sense comparators. The regulator is equipped with an undervoltage protection circuit, which shuts off the HV9931 when the voltage at the VDD pin falls below 6.2V. The VDD pin must be bypassed by a low-ESR capacitor (≥0.1 μF) to provide a low-impedance path for the high-frequency current of the output gate driver.  2020 Microchip Technology Inc. The HV9931 can also be operated by supplying voltage at the VDD pin greater than the internally regulated voltage. This will turn off the internal linear regulator, and the HV9931 will function by drawing power from the external voltage source connected to the VDD pin. For input transients that reduce the input voltage below 8V (e.g. Cold Crank condition in an automotive system), the VIN pin of the HV9931 can be connected to the MOSFET drain through a diode. Since the drain of the FET is at a voltage equal to the sum of the input and output voltages, the IC will still be operational when the input goes below 8V. In this case, a larger capacitor is needed for the VDD pin to supply power to the IC when the MOSFET is switched on. 3.3 PWM Dimming and Wall Dimmer Compatibility PWM Dimming can be achieved by applying a TTL-compatible square wave signal at the PWMD pin. When the PWMD pin is pulled high, the gate driver is enabled and the circuit operates normally. When the PWMD pin is left open or connected to GND, the gate driver is disabled and the external MOSFET turns off. The HV9931 is designed to make the signal at the PWMD pin inhibit the driver only, and the IC need not go through the entire start-up cycle each time, ensuring a quick response time for the output current. The power topology requires little filter capacitance at the output since the output current of the buck stage is continuous, and AC line filtering is accomplished through the middle capacitor rather than the output capacitor. Therefore, disabling the HV9931 via its PWMD pin or VIN pin can interrupt the output LED current in accordance with the phase-controlled voltage waveform of a standard wall dimmer. 3.4 Oscillator Connecting an external resistor from RT pin to GND programs switching frequency. See Equation 3-1. EQUATION 3-1: 25000 F SW  kHz  = ------------------------------R T  k  + 22 On the other hand, connecting the resistor from the RT pin to the GATE pin programs Constant Off-Time. Refer to Equation 3-2. EQUATION 3-2: R T  k  + 22 T OFF  s  = ------------------------------25 DS20005733A-page 7 HV9931 3.5 Input and Output Current Sensing Two current sense comparators are included in the HV9931. Both comparators have their non-inverting inputs internally connected to GND. The CS1 and CS2 inputs are inverting inputs of the comparators. Connecting a resistor divider to either of these inputs from a positive reference voltage and a negative current sense voltage signal programs the current sense threshold of the comparator. The VDD voltage of the HV9931 can be used as reference voltage. If more accuracy is needed, an external reference voltage can be applied. When either the CS1 or the CS2 pin voltage falls below GND, the gate pulse is terminated. A leading edge blanking delay of 215 ns (typical) is added. The gate voltage becomes high again upon receiving the next clock pulse of the oscillator circuit. The CS1 comparator limits the current in the input inductor L1. There is no charge in the capacitor C1 upon the start-up of the converter. Therefore, L2 cannot develop the output current, and the HV9931 starts up in Input Current Limiting mode. The CS1 current threshold must be programmed such that no input current limiting occurs in normal Steady-state operation. The CS1 threshold can be programmed in accordance with a similar equation. Refer to Equation 3-4. EQUATION 3-4: I L1  PK  R CS1 = -----------------  R REF1  R S1 7.5V Where IL1(PK) is the maximum peak current in L1. Referring to Figure 3-1, the CS2 comparator is responsible for regulating output current. The output LED current can be programmed using Equation 3-3. 3.6 The gate driving capability of the HV9931 is typically limited by the amount of power dissipation in its linear regulator. Thus, care must be taken when selecting a switching MOSFET to be used in the circuit. An optimal trade-off must be found between the gate charge and the MOSFET’s on-resistance to minimize the input regulator current. EQUATION 3-3: R CS2 MOSFET Gate Driver I L2 I O + ----------2 = -----------------------  R REF2  R S2 7.5V Where ∆IL2 is the peak-to-peak current ripple in L2. IO is the average output LED current. D1 VIN L1 D4 CIN D3 VO RS1 RS2 - VS1 + + VS2 - GATE RT OSC SQ RCS2 R CS2 CS1 RREF1 RREF2 VIN REG VDD FIGURE 3-1: DS20005733A-page 8 + PWMD RCS1 7.5V - iL2 Q1 ~AC RT L2 D2 + VC1 - iL1 ~AC C1 GND HV9931 CDD Functional Circuit Diagram.  2020 Microchip Technology Inc. HV9931 4.0 PACKAGING INFORMATION 4.1 Package Marking Information Legend: XX...X Y YY WW NNN e3 * Note: 8-lead SOIC Example XXXXXXXX e3 YYWW NNN HV9931LG e3 2036 874 Product Code or Customer-specific information Year code (last digit of calendar year) Year code (last 2 digits of calendar year) Week code (week of January 1 is week ‘01’) Alphanumeric traceability code Pb-free JEDEC® designator for Matte Tin (Sn) This package is Pb-free. The Pb-free JEDEC designator ( e3 ) can be found on the outer packaging for this package. In the event the full Microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for product code or customer-specific information. Package may or not include the corporate logo.  2020 Microchip Technology Inc. DS20005733A-page 9 HV9931 Note: For the most current package drawings, see the Microchip Packaging Specification at www.microchip.com/packaging. DS20005733A-page 10  2020 Microchip Technology Inc. HV9931 APPENDIX A: REVISION HISTORY Revision A (May 2020) • Converted Supertex Doc# DSFP-HV9931 to Microchip DS20005733A • Changed the part marking format • Updated the quantity of the 8-lead SOIC LG package from 2500/Reel to 3300/Reel to align it with the actual BQM • Made minor text changes throughout the document  2020 Microchip Technology Inc. DS20005733A-page 11 HV9931 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, contact your local Microchip representative or sales office. XX PART NO. Device - Package Options X - Environmental X Media Type Device: HV9931 = Unity Power Factor LED Lamp Driver Package: LG = 8-lead SOIC Environmental: G = Lead (Pb)-free/RoHS-compliant Package Media Type: (blank) = 3300/Reel for an LG Package DS20005733A-page 12 Example: a) HV9931LG-G: Unity Power Factor LED Lamp Driver, 8-lead SOIC Package, 3300/Reel  2020 Microchip Technology Inc. Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data Sheets. 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