HV857X Ver la hoja de datos (PDF) - Supertex Inc
Número de pieza
componentes Descripción
Fabricante
HV857X Datasheet PDF : 14 Pages
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HV857 Application Note
Circuit Selector Guide for Non Audible Noise Sensitive Applications:1
(Handheld products, PDAs, GPS, 2-way pagers, MP3)
No series resistor is used for the following circuits (R=0Ω). Also see Figure 1 and Table 3.
Table 2
Circuit
Lamp
Size
3
1.3in2
4
1.7in2
5
1.7in2
Lamp
Brightness
ft-lm Cd/m2
Supply Voltage
VDD
VIN
Lx
Supply
Current
9.38 32.10 3.3V 3.3V 12.9mA
Output
Lamp
Voltage Frequency
180Vp-p 357Hz
4.44
4.48
15.2
15.31
3.0V
3.2V
4.2V
7.4mA
5.7mA
182Vp-p
186Vp-p
160Hz
12.0
13.2
41.6
45.3
3.0V
3.2V
4.2V
23.7mA 168Vp-p
20.9mA 178Vp-p
475Hz
6
0.93in2 7.74 26.51 3.0V 3.0V 8.3mA 175Vp-p 250Hz
7
3.1in2
7.84 26.87 5.0V 5.0V 17.9mA 184Vp-p 250Hz
8
4.0in2
7.50 25.7 3.0V 3.0V 25.8mA 160Vp-p 250Hz
9
5.2in2
4.77 16.34 3.3V 3.3V 21.2mA 168Vp-p 160Hz
Note: 1. All values are nominal. Lamp brightness and current draw can vary by type and manufacturer.
External components used for Circuits 1 to 9:
The following table provides the value for external components used in Figure 1. The manufacturer and part number for the inductor is
also provided. If other value inductors are used, the circuit will need to be reoptimized.
Table 3
Circuit
1
2
3
4
5
6
7
8
9
Lx Inductor
Value
Manufacturer,
Part. No.
220µH
MuRata,
LQH32CN221K21
220µH
MuRata
LQH32CN221K21
220µH
MuRata,
LQH32CN221K21
220µH
MuRata,
LQH32CN221K21
220µH
MuRata,
LQH32CN221K21
220µH
MuRata,
LQH32CN221K21
220µH
MuRata,
LQH32CN221K21
220µH
MuRata,
LQH43MN221K01
220µH
MuRata,
LQH43MN221K01
RSW-OSC
560K
560K
560K
330K
560K
560K
560K
560K
560K
REL-OSC
2.0M
2.0M
1.5M
3.3M
1.0M
2.0M
2.0M
2.0M
3.3M
CS Capacitor
Value
Type
3.3nF
NPO
3.3nF
NPO
3.3nF
NPO
3.3nF
NPO
3.3nF
NPO
3.3nF
NPO
3.3nF
NPO
3.3nF
NPO
3.3nF
NPO
13
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