- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄361488 > TK65923M (TOKO Inc.) MEDIUM EL LAMP DRIVER PDF資料下載
參數(shù)資料
| 型號： | TK65923M |
| 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)： | 10/20頁 |
| 文件大?。?/td> | 199K |
| 代理商： | TK65923M |
Page 10
May 2000 TOKO, Inc.
TK6592x
With properly selected components, the TK6592x will
nominally support peak output voltages to 90 V
(180 V
PK-PK
). Should the EL Panel become disconnected
from the driver outputs, the removal of the load can cause
the output voltage to increase beyond 90 V. To protect
against this fault condition, a clamp circuit exists on the
high voltage output which nominally limits the output
voltage to a typical value of 105 V (210 V
PK-PK
).
THEORY OF OPERATION (CONT.)
DETAILS CONCERNING THE
H-BRIDGE SECTION OPERATION
In an effort to extend EL lamp life, reduce EMI emissions,
and reduce the power draw of the IC, current sources to
control the charging and discharging of the EL lamp panel
and special sequencing control of the H-bridge FETs were
added to the H-bridge of TK659xx.
Current sources were added between ground and the
sources of the low-side N-channel FETs (Figure 2).
Therefore, the current into and out of the EL panel is
controlled and limited.
The FETs are turned off and on in the sequence shown in
Figure 3. As is noted in Figure 3, there is a period of time
when both of lower N-channel FETs are turned on and both
of upper P-channel FETs are turned off.
This provides a
period of time to discharge the EL panel capacitance
completely;
before starting to recharge it again with current
from HV voltage rail. Therefore, this special sequencing
method prevents taking current off the HV voltage rail
during the discharge of EL panel capacitance and operates
more efficiently.
HV
HVP
HVP
UL
UR
EL Panel
LL
LR
Current Source 1
Current Source 2
EL-
EL+
FIGURE 2: H-BRIDGE SCHEMATIC
ON
ON
ON
ON
ON
UL
UR
LL
LR
VEL+
VEL =
VEL-
OFF
OFF
OFF
OFF
BOTH OFF
OFF
ON
OFF
ON
ON
BOTH ON
Discharging
EL Panel
Capacitance
VEL+
VEL-
-
OFF
OFF
FIGURE 3: H-BRIDGE SEQUENCING WAVEFORMS
相關PDF資料 |
PDF描述 |
|---|---|
| TK65923MTL | MEDIUM EL LAMP DRIVER |
| TK65924M | MEDIUM EL LAMP DRIVER |
| TK65924MTL | MEDIUM EL LAMP DRIVER |
| TK65925M | MEDIUM EL LAMP DRIVER |
| TK65925MTL | MEDIUM EL LAMP DRIVER |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TK65923MTL | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:MEDIUM EL LAMP DRIVER |
| TK65923MTL/B3 | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:MEDIUM EL LAMP DRIVER |
| TK65924M | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:MEDIUM EL LAMP DRIVER |
| 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復。