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參數(shù)資料
| 型號： | TK65924M |
| 廠商： | TOKO Inc. |
| 英文描述： | MEDIUM EL LAMP DRIVER |
| 中文描述： | 中型發(fā)光燈驅動器 |
| 文件頁數(shù)： | 14/20頁 |
| 文件大?。?/td> | 199K |
| 代理商： | TK65924M |
Page 14
May 2000 TOKO, Inc.
TK6592x
APPLICATION INFORMATION
SPLIT SUPPLY APPLICATION
The split power supply application of this EL driver IC is a circuit configuration (see Figure 4) in which the V
CC
IC power
(V
control
) is separated or split away from the main power input (V
power
) supplying current to the inductor.
CEL
5 nF
Vcontrol
from
2.7 to 6 V
max. 200 μA
C1
22 nF
D1
EL +
HV
GND
IND
EL -
VCC
L1
Vpower
from
0.9 to 20 V
FIGURE 4: SPLIT SUPPLY APPLICATION CIRCUIT
The voltage supplied to the V
CC
pin of the IC (V
control
) needs to be maintained in the 2.7 V to 6.0 V range, but the current
draw on this power supply rail of the system would be very small (under 200
μ
A). This V
control
can be used to turn on and
off the EL lamp driver, which permits the V
power
to be connected to the battery or other power source
directly
with the
least amount of resistance in the power path as possible.
Now with the V
CC
power for the IC (V
control
) being supplied from a different source, the main power (V
power
) can be any
voltage between 0.9 V and 20 V. But it is
critical to properly select the inductor
such that the proper peak current
regulation is maintained over the input voltage operating range of the converter.
If the inductor value is too large the current will rise too slowly and not have time to reach its set peak current trip point
at low input voltages, but at high input voltage the current might rise too quickly and overshoot the set peak current trip
point.
The primary battery applications for this part are in a dual cell alkaline or dual cell Li-Ion system (such as a GPS or smart
cell phones). These systems are assumed to have a minimum useable input voltage of 1.8 V for the dual cell alkaline
system and 5.4 V for the dual cell Li-Ion system.
For low converter input voltages (1.8 V and 5.4 V minimum input voltages), Table 5 shows the recommended maximum
inductance value for a given device part number (therefore a given frequency of operation) and a minimum input voltage.
Each cell in the table gives three inductance values; each value (in
μ
H) corresponds to each type of specialized Toko
EL driver inductors (D31FU, D32FU, and D52FU types of Toko inductors).
相關PDF資料 |
PDF描述 |
|---|---|
| TK65924MTL | MEDIUM EL LAMP DRIVER |
| TK65925M | MEDIUM EL LAMP DRIVER |
| TK65925MTL | MEDIUM EL LAMP DRIVER |
| TK65926M | MEDIUM EL LAMP DRIVER |
| TK65926MTL | MEDIUM EL LAMP DRIVER |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TK65924MTL | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:MEDIUM EL LAMP DRIVER |
| TK65924MTL/B4 | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:MEDIUM EL LAMP DRIVER |
| TK65925M | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:MEDIUM EL LAMP DRIVER |
| TK65925MTL | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:MEDIUM EL LAMP DRIVER |
| TK65925MTL/B5 | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:MEDIUM EL LAMP DRIVER |
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