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參數(shù)資料
| 型號： | TK6593X |
| 廠商： | TOKO Inc. |
| 英文描述： | LARGE EL LAMP DRIVER |
| 中文描述： | 大型發(fā)光燈驅(qū)動器 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 194K |
| 代理商： | TK6593X |
Page 10
May 2000 TOKO, Inc.
TK6593x
With properly selected components, the TK6593x 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
).
DETAILS CONCERNING THE
H-BRIDGE SECTION OPERATION
THEORY OF OPERATION (CONT.)
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
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TK65A10N1 | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:Switching Voltage Regulators |
| TK65E10N1 | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:Switching Voltage Regulators |
| TK65E10N1,S1X | 功能描述:MOSFET 100V N-Ch PWR FET 148A 192W 5400pF RoHS:否 制造商:STMicroelectronics 晶體管極性:N-Channel 汲極/源極擊穿電壓:650 V 閘/源擊穿電壓:25 V 漏極連續(xù)電流:130 A 電阻汲極/源極 RDS（導(dǎo)通）:0.014 Ohms 配置:Single 最大工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:Max247 封裝:Tube |
| TK65E10N1,S1X(S | 制造商:Toshiba America Electronic Components 功能描述: |
| TK65L60V,VQ(O | 制造商:Toshiba America Electronic Components 功能描述: |
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