HV856K7-G Supertex, HV856K7-G Datasheet - Page 3

• Manufacturer Part Number: HV856K7-G
• Description: Display Drivers HI VLTG TRIPLE EL LAMP DRIVER
• Manufacturer: Supertex

Specifications of HV856K7-G

• Driver Type: EL Lamp Drivers
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: DFN-10
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Electrical Specifications
Logic Input Conditions
The serial data input consists of a 10-bit string, three bits of
brightness control and one bit (10
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 nine bits are low.
Logic Input Diagram
Notes:
SDI
SCK
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.
Sym
I
D
1. SDI may be H or L if SCK is H.
2. SCK may be H or L if SDI is H.
3. While inputting serial data to the shift register, SDI can
4. The previous ten bits of serial input will be latched
LOGIC
V
f
T
T
f
I
CLK
MAX
IN
EL
SU
CS
H
change value only when SCK is L.
when SDI makes L to H transition while SCK is H.
Parameter
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
Supertex inc.
MSB of
EL1
S1
EL1 Control
S2
LSB of
th
EL1
S3
bit) to optionally control
(cont.)
1235 Bordeaux Drive, Sunnyvale, CA 94089
MSB of
EL2
S4
Min
-0.1
80
30
30
-
-
-
-
EL2 Control
94.3
Typ
500
S5
60
88
0
-
-
-
3
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.
LSB of
Max
EL2
S6
0.1
1.0
1. If all the three bits for a designated EL lamp are L, the
2. If any of the three bits for a designated EL lamp is H:
70
94
-
-
-
-
differential voltage across that lamp will be zero.
a. The 3-bit value sets the average number of cycles
b. The EL lamp brightness is linearly proportional
MSB of
Units Conditions
MHz
EL3
mA
Hz
μA
S7
ns
ns
%
Tel: [phone]
V
for which the EL lamp voltage is non-zero.
to the binary lamp control code.
EL3 Control
0 < V
See Fig.1 V
total lamp size = 3.0in
10-bit SDI serial code = 1111111111
V
---
---
---
CS
S8
= 20V, R
DD
< 7V
DD
LSB of
www.supertex.com
LOAD
EL3
S9
= V
= 20Ω
IN
= 3V,
PWR_ON
2
(1.0in
S10
2
HV856
each)
Latches
in Data