HV857K7-G Supertex, HV857K7-G Datasheet - Page 3

• Manufacturer Part Number: HV857K7-G
• Description: Display Drivers High Voltage Low Noise EL Lamp
• Manufacturer: Supertex

Specifications of HV857K7-G

• Driver Type: EL Lamp Drivers
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: DFN-8
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

DC Electrical Characteristics
* The inductor used is a 220µH Murata inductor, max DC resistance of 8.4Ω, part # LQH32CN221K21.
Block Diagram
Figure 1: Typical Application/ Test Circuit
Sym
V
f
I
f
I
SW
D
DD
EL
IN
CS
ON = V
OFF = 0V
V
V
Parameter
Input current going into the VDD pin
Input current including inductor current
Output voltage on VCS
EL lamp frequency
Switching transistor frequency
Switching transistor duty cycle
+
-
+
-
DD
IN
DD
RSW-Osc
REL-Osc
GND
VDD
0.1µF
4.7µF
Enable Signal
●
Switch
Osc
1235 Bordeaux Drive, Sunnyvale, CA 94089
Disable
560kΩ
2.0MΩ
(cont.)
C
+
_
V
Osc
EL
DD
1
2
3
4
GND
RSW-Osc VB
REL-Osc
V
VDD
* Murata Inductor
LQH32CN221K21
REF
205
HV857
Min
-
-
-
-
-
3
V
VA
LX
240
CS
Typ
SENSE
20
84
80
88
-
8
7
6
5
Max
●
150
275
25
Translator
-
-
-
Voltage
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Level
High
2.0kΩ
220µH*
BAS21
Q
Q
Q
Q
Units
kHz
mA
µA
Hz
%
V
Equivalent to 3.0in
Conditions
V
See Figure 1*
See Figure 1
See Figure 1
See Figure 1
See Figure 1
DD
●
= 1.8 to 5.0V. See Figure 1
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3.3nF,
100V
LX
CS
VA
VB
2
10nF
lamp
HV857