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Supertex inc.
Tri-EL Lamp Driver IC
Features
Tri-EL lamp driver with common terminal Independent brightness control for all 3 lamps 1.8V to 6.5V Operating Supply Voltage Output voltage regulation Two-pin serial data communication for control Linear brightness control with seven steps at constant efficiency 128kHz Fixed Switching Frequency Split supply capability Patented high efficiency EL lamp driver Single miniature inductor drives all 3 lamps Only 4 external components Burst mode power converter for best efficiency CMOS compatible serial interface with noise rejection 150nA max. leakage current when disabled Power-on reset causes all outputs to be off when first powered up Small 10-pin MSOP package 10-pin DFN/MLP package (0.8mm thickness)
HV858
General Description
The Supertex HV858 is a high voltage triple EL lamp driver designed for driving combined EL lamps of up to 3.0 in2 (1.0 in2 each). The input supply voltage range is from 1.8V to 6.5V. The device is designed such that the input voltage to the inductor can be different from the input voltage to the device (split supply). The device uses a single inductor and a minimum number of passive components. The nominal regulated output voltage that is applied to the EL lamp is 95V. The HV858 has two internal oscillators, one for the internal switching MOSFET, and the other for the high voltage EL lamp driver. The EL lamp frequency is fixed internally at 500Hz. The power converter oscillator runs 256 times faster than the EL lamp driver at 128kHz. An external inductor is connected between the LX and VDD pins (or between the LX pin and separate voltage source in the case of a split supply application). A 0.002-0.01F, 100V capacitor is connected between the Cs pin and ground. The switching MOSFET charges the external inductor and discharges it into the capacitor at the Cs pin. The voltage at Cs will start to increase. Once the voltage at Cs reaches a nominal value of 95V, the switching MOSFET is turned OFF to conserve power. One side of the 3 EL lamps is connected to the Com pin of HV858 and the other side to the EL1, EL2, and EL3 pins of the HV858. Each EL lamp output may be independently controlled to have one of the 7 brightness levels or can be completely turned OFF by a 10-bit serial data input register. The 10-bit control code has 3 bits to control the brightness level of each EL Lamp and one bit to optionally control the power converter. The 3-bit binary brightness control code controls the number of 500Hz cycles (from 0 to 7) in a group of 7 cycles.
LX
Applications
Mulit-segment, variable displays Cell phone keypads and displays MP3 players Watches
Typical Application Circuit
D
VIN
+
CIN
-
CS 1 LX 2 GND CS 10 Com 9 EL3 8 EL2 7 EL1 6 EL Lamp 3 EL Lamp 2 EL Lamp 1
VDD
+
CDD
3 VDD 4 SDI 5 SCK
-
Serial Data in Clock
HV858
A011706
Supertex inc.
A011706 * 1235 Bordeaux Drive, Sunnyvale, CA 94089 * Tel: (408) 222-8888 * FAX: (408) 222-4895 * www.supertex.com 1
HV858
Ordering Information
Device DFN/MLP-10 HV858 HV858K7-G HV858MG HV858MG-G
-G indicates the package is RoHS compliant - "Green"
Package Options MSOP-10
Absolute Maximum Ratings Pin Configuration
HV858K7
Lx GND VDD
1 2 3 4 5 10 9 8 7 6
HV858MG
CS COM EL3 EL2 EL1 Lx
1 2 3 4 5 10 9 8 7 6
VDD
CS COM
-0.5 to +7V -0.5 to +7V 0.7A peak 0.5 to +110V 250mW -65C to +150C -40C to +85C
SDI, SCK ISW VCS Power dissipation Storage temperature Operating temperature
GND VDD SDI SCK
EL3 EL2 EL1
SDI SCK
DFN/MLP-10 (top view)
MSOP-10 (top view)
Recommended Operating Conditions
Symbol VDD ISW(pk) TA Parameter Supply voltage Peak switch current Operating temperature -40 Min 1.8 Typ Max 6.5 0.4 85 Unit V A C Conditions
Specifications (unless otherwise specified:
Symbol RSW VCS VLAMP IDD ICS IDDQ fSW fEL VLOW VHIGH ILOGIC IDD VCS fEL DMAX fCLK TSU TH Parameter ON resistance of switching transistor Output voltage Differential lamp voltage VDD supply current VCS supply current VDD leakage current when disabled Inductor switching frequency Lamp frequency Logic pin input Low level Logic pin input High level Logic pin input current Inductor current Output voltage Lamp frequency Maximum PWM switch duty cycle SCK speed SDI setup time before SCK rises SDI hold time before SCK rises
TA = 25C, VDD = 2.6V to 5.5V)
Min 85 170 0.01 10
Typ. 4 95 190 0.15 50 100
Max 6 105 210 0.25 100 150 147.2 575 0.2 VDD VDD + 0.5 0.1 70
Unit V V mA nA kHz Hz V V mA V Hz
Conditions VDD = 1.8 to 6.5V, ISW = 100mA S1...S9 = 0, VDD = 1.8 to 6.5V, no load VCOM to any EL, no load, code1 = 111 VCS = 20V, no load, PWR_ON = 1 VCS = 75V, no load S1...S9 = 0, SCK and SDI can be tied to VDD or GROUND See Figure 1 For all codes except code1 = 000
108.8 425 -0.5 0.8 VDD -0.1
128 500 0 VDD 0 56 82.5 500
0 < VDD< 7V See Figure 1. VDD = VIN = 3V, total lamp size = 3.0in2 (1.0in2 each), 10-bit SDI serial code = 1111111111 VCS = 20V, RLOAD = 20
80
88
94 1
% MHz ns ns
30 30
Note 1: Code refers to the 3-bit Brightness Control Code for the respective EL Lamp
A011706
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HV858
Pin Configuration
Pin
1 2 3 4 5 6 7 8 9 10
Name Description
LX GND VDD SDI SCK EL1 EL2 EL3 COM CS Inductor pin Ground pin Input voltage supply pin. It is common practice to use a bypass capacitor as close as possible to the device on this pin. Serial data input pin Serial clock input pin EL lamp 1 pin EL lamp 2 pin EL lamp 3 pin Common pin for one side of all 3 EL lamps High Voltage capacitor pin
Logic Input Conditions
The serial data input consists of a 10-bit string, 3-bits of brightness control and one bit(10th bit) to optionally control the power converter. The power converter runs if any of the EL lamps has a non-zero brightness value or if the PWR_ON bit is high while the other 9 bits are low. 1. 2. 3. SDI may be H or L if SCK is H.
EL Lamp Brightness Control
The EL Lamp brightness control is a 3-bit binary number stored in a latch, which is provided by a serial to parallel conversion shift register. 1. If all the 3 bits for a designated EL lamp are L, the differential voltage across that lamp will be zero. If any of the 3 bits for a designated EL lamp is H: a. The 3-bit value sets the average number of cycles for which the EL lamp voltage is non-zero. The EL lamp brightness is linearly proportional to the binary lamp control code.
2. SCK may be H or L if SDI is H. While inputting serial data to the shift register, SDI can change value only when SCK is L. The previous 10 bits of serial input will be latched when SDI makes L to H transition while SCK is H.
b.
4.
Logic Input Diagram
S1 S2 S3 S4 S5 S6 S7 S8 S9 S10
SDI
MSB of EL1 LSB of EL1 MSB of EL2 LSB of EL2 MSB of EL3 LSB of EL3 PWR_ON
EL 1 Control
SCK
EL 2 Control
EL 3 Control
Note: 1. Serial data is latched when SDI makes L to H transition and while SCK is H. 2. S1 is the first serial data input being fed.
Latches in Data
A011706
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HV858
Logic Truth Table
L = Low (L = 0 to L < 20% of VDD) H = High (80% of VDD < H = VDD) NA = Does not control brightness of the designated EL lamp
Brightness Level Device disabled Device enabled
All lamps Off
S1
L
S2
L
S3
L
S4
L
S5
L
S6
L
S7
L
S8
L
S9
L
S10
L
L 7/7 6/7 5/7 4/7 H H H H L L L L NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
L H H L L H H L L NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
L H L H L H L H L NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
L NA NA NA NA NA NA NA NA H H H H L L L L NA NA NA NA NA NA NA NA
L NA NA NA NA NA NA NA NA H H L L H H L L NA NA NA NA NA NA NA NA
L NA NA NA NA NA NA NA NA H L H L H L H L NA NA NA NA NA NA NA NA
L NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA H H H H L L L L
L NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA H H L L H H L L
L NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA H L H L H L H L
H NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
EL1
3/7 2/7 1/7 Off 7/7 6/7 5/7 4/7
EL2
3/7 2/7 1/7 Off 7/7 6/7 5/7 4/7
EL3
3/7 2/7 1/7 Off
A011706
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HV858
Functional Block Diagram
Lx 1N914
VIN
+ -
CIN Enable
VDD
LX
Cs
Cs
Switch Osc
EL1
VSENSE
Disable
SDI SCK
Logic Control
Note: This drawing is a generalized representation. Actual internal circuitry may differ.
Differential Output Waveform
The following is the differential output waveform across the lamp for each 3-bit input code for each lamp.
Code 000 500Hz Code 001
Code 010
Code 011
Code 100
Code 101
Code 110
Code 111
Group of 7 Cycles .....Pattern Repeats....
5
VREF Output Drivers
Vcs
GND
+
Vcs
EL2
EL1 EL2 EL3 COM
EL3
Vcs
COM
A011706
HV858
Figure 1 : Test Circuit
LX = 68H ** D = IN914* CS = 3.3nF, 100V CIN = 4.7F 1 LX 2 GND CS 10 Com 9 EL3 8 EL2 7 EL1 6 EL Lamp 3
(1.0 in2)
VIN
+ -
VDD
+ -
3 VDD CDD = 0.1F Stream of Serial Data (1's and 0's) 4 SDI 5 SCK
EL Lamp 2
(1.0 in2) (1.0 in2)
EL Lamp 1
HV858
*Any 100V fast reverse recovery diode can be used Note: Maximum lamp size for each segment is 1.0 in2. To drive larger size lamps, any combination of EL1, EL2 and EL3 can be paralleled. However, the 3-bit serial data input code (for each output) should be such that the paralleled outputs have the same code.
Typical Performance (V
st
DD
= VIN = 3.0V)
EL1 Brightness IDD (mA) Level 0/7 1/7 2/7 3/7 4/7 5/7 6/7 7/7 ft-lm 0 1.60 3.24 4.95 6.68 8.44 10.21 12.05 Cd/m 0 5.46 11.08 16.94 22.85 28.85 34.93 41.2
2
1 9-bit SDI code 000111111 001111111 010111111 011111111 100111111 101111111 110111111 111111111
VCS (V) 85.7 85.3 84.9 84.5 84.0 83.5 82.9 82.5
42.6 44.7 46.9 48.9 51.2 53.3 55.0 56.2
A011706
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HV858
10-Lead DFN/MLP Package Outline (K7)
0.118 (3.000) 0.087 (2.200) 0.020 (0.500)
0.059 (1.500) 0.118 (3.000) 0.059 (1.500) 0.063 (1.600)
Pin #1 Index
Top View
0.02950.002 (0.750.05)
Bottom View
Side View
+0.001 -0.001 +0.030 0.020 -0.020
0.001
)
0.008 (0.200)
10-Lead MSOP Package Outline (MG)
0.0200.006 (0.5000.152) GATE PLANE = 0.1930.004 (4.9000.100) 0.1180.004 (3.0000.100) 0- 6 0.0210.005 (0.5500.150) 0.010 (0.250)
Full Circle or Half Circle
DETAIL A
0.1180.004 (3.0000.100) 0.0070.002 (0.1800.050)
0.0370.005 (0.950.015)
0.0330.004 (0.8500.100)
SEE DETAIL A
0.0130.003 (0.3250.075)
0.0040.002 (0.1000.050)
Supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell its products for use in such applications, unless it receives an adequate "product liability indemnification insurance agreement". Supertex 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 or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the Supertex website: http//www.supertex.com.
(c)2006 Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited.
Doc. # DSFP-HV858 A1011706
7
)
) )
Pin #1 Index
+0.006 -0.004 +0.150 0.300 -0.100
0.012
)
+0.002 -0.003 +0.050 0.250 -0.070
0.010
)
Dimensions in Inches (Dimensions in Millimeters) 2. MLP Package dimensions conform to JEDEC MO-229 1. Measurement Legend =
Supertex inc.
1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 222-8888 / FAX: (408) 222-4895 A011706
www.supertex.com

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