HV881K7-G

Supertex inc. HV881 Dimmable, Low Noise, 16 channel EL Lamp Driver Features ►► Sixteen channel EL lamp driver with single common terminal ►► 1nF maximum load on each of the sixteen channels ►► Independent dimming capability for all lamps ►► Sixteen brightness levels for each lamp ►► 1.8 to 5.5V operating supply range ►► 1.7V logic interface ►► Dedicated enable logic pin ►► 340VP-P nominal output voltage for high brightness ►► Low audible noise ►► Output voltage regulation ►► EL1 - EL16 outputs fall time control ►► Two EL frequency controls ►► External switching MOSFET ►► I2C data communication control ►► Single lithium-ion cell compatible ►► One miniature inductor to power sixteen lamps ►► Independent lamp and converter frequency setting ►► Split supply capability ►► 5x5mm, 32-Lead QFN package The HV881 has two internal oscillators and a high voltage EL lamp driver. An external MOSFET is driven by the switch oscillator to generate output voltage. The frequency for the external switching MOSFET is set by an external resistor connected between the RSW-Osc pin and the VDD supply pin. The EL lamp driver frequency can be set by either an external logic signal frequency at the SEL pin or by an external resistor connected between the REL-Osc pin and VDD pin. If external frequency is input at the SEL pin, the REL-Osc pin should be connected to ground. An external inductor is connected between the LX and VDD or VIN pins for split supply applications. Depending upon the EL lamp sizes, a 1.0 to 10.0nF capacitor is connected between the CS pin and ground. The CS capacitor is connected to the internal H-bridge, and the energy stored in the capacitor is therefore transferred to the EL lamp. One side of all the sixteen EL lamps is connected to the respective EL pins (EL1, EL2, etc.), and the other side is connected to the COM pin. Applications The external switching MOSFET charges the inductor and discharges it into the capacitor at CS. The voltage at CS will start to increase. Once the voltage at CS reaches the desired regulation limit, the external switching MOSFET is turned off to conserve power. General Description The HV881 allows for controlling the fall time of the EL1 - EL16 outputs by an external resistor from the RSLOPE pin to the VDD pin. This feature can be used to reduce the audible noise of the EL lamp or to increase the lamp brightness. ►► ►► ►► ►► ►► Multi-segment, variable displays Cell phone keypads and displays Multi-segment remote controls Handheld wireless communication products Global Positioning Systems (GPS) The Supertex HV881 is a 16 channel EL lamp driver with a single common terminal. It can drive up to a 1nF EL lamp load (approx. 0.3in2 lamp size) on each of the sixteen channels. The input supply voltage range is 1.8 to 5.5V. The logic interface to the device can be as low as 1.7V. The device has an enable logic input pin to turn the device on or off. The device is designed to minimize audible noise emitted by the EL lamp. The HV881 uses an external MOSFET, a single inductor and minimum number of passive components to drive all sixteen EL lamps. The device is designed such that the input voltage to the inductor can be different from the input voltage to the device (split supply). Supertex inc. The brightness of each of the sixteen EL lamps can be independently controlled to have one of fifteen brightness levels or can be completely turned off by the serial data (SDA) input. The serial data input has a 4-bit binary code for each lamp, to control the brightness level from level 0 to level 15. The brightness is controlled by controlling the number of EL frequency cycles (from 0 to 15) in a group of 15 cycles. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com HV881 Pin Configuration Ordering Information 32 32-Lead QFN Device 5.00x5.00mm body 0.8mm height (max) 0.50mm pitch HV881 HV881K7-G 1 -G indicates package is RoHS compliant (‘Green’) 32-Lead QFN Package (top view) Absolute Maximum Ratings Parameter Note: Pads are at the bottom of the package. Center heat slug is at ground potential. Value VDD, supply voltage -0.5 to 7.0V EN, SDA, SCL, SEL Product Marking -0.5 to VDD +0.5V VCS, output voltage -0.5 to 215V VREG, external input voltage L = Lot Number YY = Year Sealed LLLLLL WW = Week Sealed YYWW A = Assembler ID AAACCC C = Country of Origin = “Green” Packaging 32-Lead QFN Package HV881 0.48V Storage temperature -65°C to +150°C Maximum junction temperature +125°C 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. Package may or may not include the following marks: Si or Thermal Resistance Package θja 32-Lead QFN 25°C/W (Mounted on 4-layer FR4 9-via PCB, 76mm x 114mm x 1.44mm) Recommended Operating Conditions Sym Parameter Min Typ Max Units Conditions VDD Supply voltage 1.8 - 5.5 V --- fSW Switching frequency 50 - 200 kHz --- fEL EL output frequency 200 - 1000 Hz --- SEL Input for EL output frequency 1600 - 8000 Hz SEL = 8 x (fEL) and 50% duty cycle CLOAD Lamp capacitance per EL output 0 - 1.0 nF --- CCOM COM lamp capacitance 0 - 16 nF --- Tj Operating temperature -40 - +85 °C --- Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com 2 HV881 Electrical Characteristics (Over recommended operating conditions unless otherwise specified TJ = 25°C) Sym Parameter Min Typ Max Unit Conditions VCS Output regulation voltage 145 170 195 V VDD = 1.8 to 5.5V VLAMP Differential output voltage 290 340 390 V VDD = 1.8 to 5.5V IDDQ Quiescent VDD supply current - - 1000 nA VDD = 5.5V IDD Input current going into the VDD pin - - 350 µA VDD = 5.5V, REL = 2.0MΩ RSW =1.0MΩ, RSL = 800kΩ IIN Input current including inductor current - - 110 mA See Typical Application Circuit, VIN = 4.2V External input voltage range 0 - 0.44 V VDD = 1.8 to 5.5V fEL EL Lamp frequency - 200 - Hz REL =2.0MΩ fSW Switching transistor frequency - 90 - kHz RSW =1.0MΩ D External MOSFET duty cycle - - 88 % --- VIH SEL, EN, SDA, SCL logic pins input high level 1.7 - VDD V VDD = 1.8 to 5.5V VIL SEL, EN, SDA, SCL logic pins input low level 0 - 0.2 V VDD = 1.8 to 5.5V ILogic EN, SDA, SCL pins input current -1.0 - 1.0 µA VDD = 1.8 to 5.5V SEL logic pin input current -1.0 - 12.0 µA VDD = 1.8 to 5.5V External MOSFET gate voltage - 8.0 - V VDD = 1.8 to 5.5V tGATE-RISE External MOSFET gate voltage rise time - 100 - ns VDD = 1.8 to 5.5V, CL = 330pF tGATE-FALL External MOSFET gate voltage fall time - - 20 ns VDD = 1.8 to 5.5V, CL = 330pF EL1 - EL16 outputs fall time for ½ EL cycle - 190 - µs RSL = 800kΩ, VDD = 3.0V, VCS =170V fCLK SCL speed - - 500 kHz --- tSU Setup time before clock falls 300 - - ns --- tH Hold time after clock falls 850 - - ns --- VREG ILogic-SEL VGATE tf Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com 3 HV881 Typical Application Circuit VIN 4.7µF 68µH (Cooper SD53-680-R) 0.1µF 3.3nF, 200V Vishay SiA456DJ 100kΩ VREG VOUT VDRIVE VDD BAS20 GATE CS EL1 VDD 2.0MΩ 0.1µF 0.3in2 EL Lamp 1 0.3in2 EL Lamp 2 EL2 REL-Osc 1.0MΩ HV881 RSW-Osc 0.3in2 EL Lamp 3 EL3 800kΩ RSLOPE EL4 ON = 1.7V to VDD OFF = 0.7 to 0.2V EN EL5 ON = 1.7V to VDD OFF = 0 to 0.2V SEL I2C Control: SCL ON = 1.7V to VDD OFF = 0 to 0.2V SDA 0.3in2 EL Lamp 4 0.3in2 EL Lamp 5 0.3in2 EL Lamp 16 EL16 GND HVGND COM Note: The LX MOSFET may be changed depending on output load and required output power. Test Data VDD (V) 3.0 Lamp Size 0.3in2 lamp on each of the EL1 - EL16 outputs Supertex inc. VIN IIN (V) (mA) 3.2 VCS fEL Lamp Brightness (V) (Hz) 72.1 160 190 33 3.7 62.3 160 190 35 4.2 52.3 160 190 36 ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com 4 (cd/m2) HV881 Typical Output Waveform VCS EL1 COM EL Lamp Brightness Control using I2C No of bits 1 bit 7 bits 1 bit 1 bit 8 bits 1 bit 8 bits 1 bit 8 bits 1 bit 8 bits 1 bit 8 bits 1 bit 8 bits 1 bit 8 bits 1 bit 8 bits 1 bit 1 bit - start bit slave addr W bit Ack byte 0 Ack byte 1 Ack byte 2 Ack byte 3 Ack byte 4 Ack byte 5 Ack byte 6 Ack byte 7 Ack stop bit The I2C format for the SDA input is shown below: Note: The I2C is write-only. So the W bit has to always be logic low. (A “0” indicates a transmission write). 7-bit slave address: 000 0110 (0x06 in hex) Each of the EL lamp’s brightness controls is a 4-bit binary number which is provided by the serial data input (SDA). Byte 0 controls both the 16 level brightness of EL_lamp1 (bit0 - bit3) and EL_lamp2 (bit4 - bit7) and similarly, other bytes control the brightness of other pairs of lamp. 1. If all the 4 bits for a designated EL lamp are L, the differential voltage across the lamp is zero. 2. If any of the 4 bits for a designated EL lamp is H: a. The 4-bit value sets the average number of cycles for which the EL lamp voltage is non-zero. b. The EL lamp brightness is linearly proportional to the binary lamp control code. Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com 5 HV881 Block Diagram VIN CIN VDD LX D CS CG CDD VDD Device Enable VDRIVE GATE EN RSW RSW-Osc 8V Linear Regulator CS PWM Switch Oscillator 0 to 88% VCS EL1 C VREG VOUT REL 1.26V VREF 60pF RREG EL Frequency 1.0MΩ SCL RSLOPE GND VCS EL16 EL Lamp 16 SEL RSL Output Drivers 2 x EL Freq. REL-Osc SDA EL Lamp 1 VSENSE + - I2C Control for 16 Level EL Lamp Dimming EL1 to 16 COM VCS COM Output Discharge Slew Rate Control HVGND Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com 6 HV881 Pin Configuration and External Component Description Pin # Pin Name Description 1 REL-Osc The external resistor from REL-Osc to VDD 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. 2 RSLOPE The external resistor, RSL, from RSLOPE to VDD, controls the EL1 - EL16 outputs discharge time. The equation for the EL1 - EL16 outputs typical fall time is: tf(typ) = VCS / ((VDD - 0.85) / (RSL • 3pF))µs. 3 RSW-Osc The external resistor from RSW-Osc to VDD sets the switch converter frequency. The switch converter frequency is inversely proportional to the RSW resistor value. Reducing the resistor value by a factor of two will result in increasing the switch converter frequency by two. The input voltage to set the VCS regulation voltage. This pin allows an external voltage source to control the VCS amplitude in the range from 0 to 195V. 4 VREG The output voltage is (403 ± 10%) • VREG. The VREG voltage can also be set by using an external resistor between VREG and VOUT pins. The output charging rate is inversely proportional to the resistor value. Switched and voltage divided to one-third the internal reference voltage. An external resistor between VREG and VOUT pins controls the VCS charging rate. If this pin is not used, then it should be left floating. 5 VOUT 6 VDD The low voltage input supply pin. 7 GND Device ground. 8 EN 9 – 16 1.7V logic input pin to turn the device ON/OFF. A logic high turns ON the device and a logic LOW turns the device OFF. EL16 - EL9 EL lamp 16, EL lamp 15 …. EL lamp 9 connections. 17 COM The common connection for all the 16 EL lamps. 18 – 25 EL8 - EL1 EL lamp 8, EL lamp 7 …. EL lamp 1 connections. 26 HVGND 27 CS Connect a 0.001µF to 0.01µF 200V capacitor between this pin and ground. This capacitor stores the energy transferred from the inductor. 28 SCL The I2C logic serial clock input pin. 29 SDA The I2C logic serial data input pin. High voltage ground. It should be connected to device ground. The gate control pin for the switching MOSFET. The connection for an external MOSFET. 30 GATE 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 external MOSFET threshold voltage minimum value should be equal to VDD or lower. 31 VDRIVE Drive voltage for the MOSFET gate voltage. An external bypass capacitor (CG) is required to ground. The external logic signal input pin to set the EL frequency. If this pin is used, the REL-Osc pin should be connected to ground. 32 SEL Center Pad The frequency input at this pin should be at 50% duty cycle and at eight times the desired EL output frequency. If this pin is not used then it should be left floating. This pin has an internal pulldown resistor of 1.0MΩ ± 50%. Center heat slug, externally connected to Ground. Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com 7 HV881 32-Lead QFN Package Outline (K7) 5.00x5.00mm body, 0.80mm height (max), 0.50mm pitch D2 D 32 32 Note 1 (Index Area D/2 x E/2) 1 1 Note 1 (Index Area D/2 x E/2) e E E2 b View B Top View Bottom View Note 3 θ A A3 A1 L 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 0.70 0.00 NOM 0.75 0.02 MAX 0.80 0.05 A3 0.20 REF b D D2 E E2 0.18 4.85* 1.05 4.85* 1.05 0.25 5.00 - 5.00 - 0.30 5.15* 3.55 5.15* 3.55 † e † L L1 θ 0.30 0.00 0O 0.40† - - 0.50 0.15 14O † 0.50 BSC † JEDEC Registration MO-220, Variation WHHD-6, 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-32QFNK75X5P050, Version A052311. (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. ©2011 Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited. Doc.# DSFP-HV881 A060811 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com 8