Supertex inc. HV816 High Voltage, Dimmable EL Lamp Driver Features 360VPP output voltage for high brightness Large output load capability of up to 150nF 2.7 to 5.5V operating supply voltage Single lithium ion cell compatible Adjustable output regulation for dimming External switching MOSFET Low audible noise Output discharge slew rate control 1.5V logic Dedicated Enable pin Two EL frequency controls Independent lamp and converter frequency setting Split supply capability Available in 16-Lead 4x4 QFN package Applications Laptop keyboards Netbook keyboards Display signs Portable instrumentation equipment Electronic organizers General Description The Supertex HV816 is a high voltage Electroluminescent (EL) lamp driver designed for driving a lamp capacitance of up to 150nF, or an area of approximately 42 square inches. It is comprised of a boost converter followed by an H-bridge. The boost converter produces a regulated output voltage, which is set at a nominal value of 180V using an internal reference voltage. The H-bridge is used to produce a differential output drive and the EL lamp will therefore see 180V (360V peak-to-peak). The HV816 has two internal oscillators, one for controlling the boost converter switching frequency and the other for controlling the H-bridge switching frequency. Having separate control of each switching frequency allows flexibility in the circuit design. Supertex inc. The operating input supply voltage is 2.7 to 5.5V, but the Enable (EN) and Select (SEL) interface to the device will accept logic high levels down to 1.5V. The EN input is for turning the device ON and OFF. The SEL input is for external logic control of the H-bridge switching frequency, if required. The HV816 boost converter stage uses a single inductor and a minimum number of external components. The input voltage to the inductor can be different from the input voltage to the HV816 (split supply). The external inductor is connected either between the LX and VDD pins or, for split supply applications, between the LX pin and a higher voltage supply (shown as VIN in the Block Diagram). An external MOSFET has to be driven by the switch oscillator to generate a high voltage. The switching frequency for this MOSFET is set by an external resistor connected between the RSW-Osc pin and the supply pin VDD. During operation, the external switching MOSFET turns on and allows energy to be stored in the inductor; this energy is transferred into the capacitor CS when the MOSFET turns off. The voltage at the CS pin will increase with every switching cycle. Once the voltage at the CS pin reaches the desired regulation limit, nominally 180V, the external switching MOSFET is turned OFF to conserve power. The CS capacitor is connected between the CS pin and ground; the CS pin is internally connected to the H-bridge. Energy from the boost converter stage is stored in the capacitor before being transferred to the EL lamp. Depending on the EL lamp sizes, a 1.0nF to 15nF capacitor should be used for CS. The EL lamp switching frequency can be in the range of 100Hz to 1.0kHz. This frequency can be set by either an external logic signal at the SEL pin, with a frequency that is 4 times the desired EL lamp switching frequency, or by an external resistor connected between the REL-Osc and VDD pins. If external frequency is input to the device at the SEL pin, the REL-Osc pin should be connected to ground. The HV816 has the provision to control the discharge rate of the output to minimize audible noise emitted by the EL lamp, which is connected between the VA and VB pins. An external resistor from the RSLEW-OUT pin to ground controls the VA, VB output discharge rate. EL lamp dimming can be accomplished by changing the input voltage to the VREG pin. The VREG pin allows an external voltage source to control the VCS amplitude. The VCS voltage is approximately 143 times the voltage at the VREG pin. 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com HV816 Fig. 1 : Typical Application Circuit VIN CIN 47F LX = 22H (Cooper DR1030-220-R) CG 0.1F CS 12nF 200V ES1D Vishay Si7820DN RREG = 3.3M VREG VDD CDD 47F REL = 1.0M CFEL 100nF CSW 100nF RSW = 1.0M RSLEW = 100k VOUT VDRIVE LX GATE VA REL-Osc HV816 ON = 1.5V to VDD EN RSLEW-OUT GND OFF = 0V to 0.2V SEL HVGND LX D VIN VDD CIN CDD EN RSW Device Enable RSW-Osc VDD VOUT REL-Osc SEL RSLEW-OUT RSLEW Supertex inc. LX VDRIVE GATE CS 7V Linear Regulator VCS PWM Switch Oscillator 0 to 88% VA + - 60pF RREG REL CS CG VREG External EL Frequency Control CEL 80nF VB RSW-Osc Block Diagram Input Logic Control: ON = 1.5V to VDD OFF = 0 to 0.2V CS VDD VSENSE 1.26V VREF EL Lamp Output Drivers VCS 2x EL Frequency VB EL Frequency GND HVGND HV816 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com 2 HV816 Ordering Information Part Number Package Packing HV816K6-G 16-Lead (4x4) QFN 3000/Reel -G indicates package is RoHS compliant (`Green') ESD Sensitive Device Absolute Maximum Ratings Pin Configuration Parameter Value Supply voltage, VDD -0.5 to +7.0V Output voltage, VCS -0.5 to +215V Junction temperature +125C Storage temperature -65C to +150C Power dissipation: 16-Lead QFN LX GATE VDRIVE HVGND 16 RSW-Osc CS 1 REL-Osc VA SEL VB VREG EN 1.6W Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied. Continuous operation of the device at the absolute rating level may affect device reliability. All voltages are referenced to device ground. VOUT VDD GND RSLEW-OUT 16-Lead QFN (K6) (top view) Center heat slug is at ground potential. Pads are at the bottom of the package. Product Marking Y = Last Digit of Year Sealed W = Code for Week Sealed L = Lot Number = "Green" Packaging H816 YWLL Package may or may not include the following marks: Si or 16-Lead QFN (K6) Recommended Operating Conditions Sym Parameter Min Typ Max Units VDD Supply voltage 2.7 - 5.5 V --- fSW Switching frequency 50 - 200 kHz --- fEL EL output frequency 100 - 1000 Hz --- SEL Input for EL output frequency 400 - 4000 Hz SEL = 4* (fEL) and 50% duty cycle Output discharge slew rate control resistor 100 - 500 k --- 0 - 150 nF --- -40 - +85 O C --- RSLEW CEL Tj EL lamp load capacitance Operating temperature Supertex inc. Conditions 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com 3 HV816 Electrical Characteristics DC Characteristics (Over recommended operating conditions unless otherwise specified Sym - TJ = 25C) Parameter Min Typ Max Units Conditions VCS Output regulation voltage 160 180 200 V VDD = 2.7 to 5.5V VLAMP Differential output voltage 320 360 400 V VDD = 2.7 to 5.5V IDDQ Quiescent VDD supply current - - 2.0 A VDD = 5.5V, EN = Low IDD Input current going into the VDD pin - - 3.0 mA VDD = 2.7 to 5.5V, VIN = 5.0V, CEL = 80nF, see Fig. 1 IIN-LOAD Input current including inductor current with load - - 380 mA VDD = 5.5V, VIN = 5.0V, REL = 1.0M, RSW = 1.0M, see Fig. 1 IIN-NOLOAD Input current including inductor current without load - - 80 mA VDD = 2.7 to 5.5V, VIN = 5.0V No Load, see Fig. 1 IINQ Quiescent VIN (inductor input voltage) supply current - - 10 A VIN = 10V, EN = Low, see Fig. 1 External input voltage range 0 - 1.33 V VDD = 2.7 to 5.5V fEL EL lamp frequency - 200 - Hz REL = 1.0M fSW External MOSFET switching frequency - 90 - kHz RSW = 1.0M D External MOSFET duty cycle - - 88 % --- VIH EN, SEL logic pins input high level 1.5 - VDD V VDD = 2.7 to 5.5V VIL EN, SEL logic pins input low level 0 - 0.2 V VDD = 2.7 to 5.5V VREG ILOGIC EN, SEL logic pins high current -1.0 - 1.0 A VDD = 2.7 to 5.5V VGATE External MOSFET gate voltage - 7.0 - V VDD = 2.7 to 5.5V tGATE-RISE External MOSFET gate voltage rise time - 100 200 ns VDD = 2.7 to 5.5V, CLOAD = 500pF tGATE-FALL External MOSFET gate voltage fall time - - 20 ns VDD = 2.7 to 5.5V, CLOAD = 500pF Output fall time - 180 - s CEL = 150nF, VCS = 180V, RSLEW = 100k On-resistance of internal n-channel MOSFET at LX pin - - 30 Guaranteed by design. tVA-FALL or tVB-FALL RON Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com 4 HV816 Pin Configuration and External Component Description Pin # Pin Name Description RSW-Osc External resistor, RSW, from the RSW-Osc to VDD pins sets the switch converter frequency. The switch converter frequency is inversely proportional to the external RSW resistor value. Reducing the resistor value by a factor of two will result in increasing the switch converter frequency by two. A CSW capacitor is recommended from RSW-Osc to the VDD pin to shunt any switching noise that may couple into the RSW-Osc pin. A CSW capacitor with a value of 100nF is typically recommended. 2 REL-Osc External resistor, REL, from the REL-Osc to VDD pins sets the EL frequency. The EL frequency is inversely proportional to the external REL resistor value. Reducing the resistor value by a factor of two will result in increasing the EL frequency by two. The SEL pin should be connected to ground if the REL resistor is used to set the EL frequency. A CFEL capacitor is recommended from the REL-Osc to VDD pins to shunt any switching noise that may couple into the REL-Osc pin. A CFEL capacitor with a value of 100nF is typically recommended. 3 SEL External logic signal input to set the EL frequency. The REL-Osc pin should be connected to ground to use this pin. The output EL frequency is 1/4 of the frequency input at this pin. This pin if not used, should be connected to ground. Input logic high is 1.5V to VDD. Input logic low is 0 to 0.2V. 4 VREG Input voltage to set VCS regulation voltage. This pin allows an external voltage source to control the VCS amplitude. The VCS voltage = (143 5%) x VREG. An external resistor, RREG, connected between the VREG and VOUT pins controls the VCS charging rate. The charging rate is inversely proportional to the RREG resistor value. 5 VOUT Switched internal reference voltage. 6 VDD Device low voltage input supply pin. 7 GND Device ground. 1 8 RSLEW-OUT An external resistor, RSLEW, from this pin to ground controls the slew rate of VA and VB output discharge. The output discharge slew rate is inversely proportional to the RSLEW resistor value. The VA, VB output discharge time is given by the equation (RSLEW x CEL) sec tVA-fall or tVB-fall = 43.73 9 EN Enable logic pin to turn the device ON/OFF. Input logic high is 1.5V to VDD. Input logic low is 0 to 0.2V. 10 VA 11 VB 12 CS 13 HVGND High Voltage Ground. Connect it to device ground 14 VDRIVE Drive voltage for the Gate voltage and also internal regulated voltage for the output drivers. An external capacitor (CG) is required at this pin to ground. 15 GATE Gate control pin for the switching MOSFET. Connection for an external MOSFET. The external MOSFET is used to boost the low input voltage by inductive flyback. When the MOSFET is ON, the inductor is being charged. When the MOSFET is OFF, the charge stored in the inductor will be transferred to the high voltage capacitor CS. The energy stored in the capacitor is transferred to the internal H-bridge, and therefore to the EL lamp. In general, low RON MOSFET's, which can handle more current, are more suitable to drive larger size lamps. Also, a small value inductor should be used. But as the RON value and the inductor value decrease, the switching frequency of the inductor (controlled by RSW) should be increased to avoid inductor saturation. The inductor input voltage (VIN) is recommended to be minimum 4.5V to get the 180V output regulation voltage with 150nF EL load. 16 LX Drain of the internal N-channel MOSFET. The internal MOSFET is used to generate the GATE pin voltage at startup. Lamp connections. The polarity is irrelevant. The EL load capacitance is up to 150nF. High voltage regulated output. Connection for an external high voltage capacitor to ground. A 0.001F to 0.015F 200V capacitor can be used to store the energy transferred from the inductor. Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com 5 HV816 16-Lead QFN Package Outline (K6) 4.00x4.00mm body, 1.00mm height (max), 0.65mm pitch D 16 D2 Note 1 (Index Area D/2 x E/2) 16 1 1 e Note 1 (Index Area D/2 x E/2) E E2 b Top View Bottom View View B Note 3 L A A3 A1 Seating Plane L1 Note 2 Side View View B Notes: 1. A Pin 1 identifier must be located in the index area indicated. The Pin 1 identifier can be: a molded mark/identifier; an embedded metal marker; or a printed indicator. 2. Depending on the method of manufacturing, a maximum of 0.15mm pullback (L1) may be present. 3. The inner tip of the lead may be either rounded or square. Symbol Dimension (mm) A A1 MIN 0.80 0.00 NOM 0.90 0.02 MAX 1.00 0.05 A3 0.20 REF b D D2 E E2 e 0.25 3.85* 2.50 3.85* 2.50 0.30 4.00 2.65 4.00 2.65 0.35 4.15* 2.80 4.15* 2.80 0.65 BSC L L1 0.00 0O 0.40 - - 0.50 0.15 14O 0.30 JEDEC Registration MO-220, Variation VGGC-2, Issue K, June 2006. * This dimension is not specified in the JEDEC drawing. This dimension differs from the JEDEC drawing. Drawings not to scale. Supertex Doc.#: DSPD-16QFNK64X4P065, Version C041009. (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to http://www.supertex.com/packaging.html.) Supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such applications unless it receives an adequate "product liability indemnification insurance agreement." Supertex inc. does not assume responsibility for use of devices described, and limits its liability to the replacement of the devices determined defective due to workmanship. No responsibility is assumed for possible omissions and inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications refer to the Supertex inc. (website: http//www.supertex.com) Supertex inc. (c)2012 Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited. Doc.# DSFP-HV816 B032012 6 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com