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参数资料
| 型号： | IR21571 |
| 厂商： | International Rectifier |
| 英文描述： | FULLY INTEGRATED BALLAST CONTROL IC |
| 中文描述： | 完全集成的镇流器控制IC |
| 文件页数： | 11/17页 |
| 文件大小： | 234K |
| 代理商： | IR21571 |
IR21571
(S)
www.irf.com
11
The Preheat Time is programmed by means of the
preheat capacitor, C
PH
, an internal 1
μ
A current
source, and an internal threshold on the C
PH
lead of
4.0V, according to the following formula:
At the end of the Preheat Time, the internal, open-
drain transistor holding the R
PH
lead to ground turns
off, and the voltage on this lead charges exponentially
up to the R
T
lead potential. During this Ignition Ramp
Mode, the output frequency exponentially decays to
a minimum value. The rate of decay of this frequency
is a function of the R
PH
* C
PH
time constant. Because
the Ignition Ramp Mode ends when the voltage on
the C
PH
lead reaches 5.15V, the Ignition Ramp Mode
is always 1/4th as long as the preheat time.
When the C
PH
lead reaches 5.15V, an open-drain
transistor on the RUN lead turns on, and the external
R
RUN
resistor is then in parallel with the R
T
resistor.
The Run Mode operating frequency is therefore a
function of the parallel combination of R
RUN
and R
T
,
and this means that the operating power of the lamp
can be programmed by means of R
RUN
.
Figure 8: fosc versus effective R
T
(t
DEAD
= 2.0 usec)
Figure 9: fosc versus effective R
T
(t
DEAD
= 1.0 usec)
The following graphs, Figures 8 and 9, illustrate the
relationship between the effective R
T
resistance (i.e.,
the parallel combination of resistors which programs
the C
T
capacitor charging current) and the operating
frequency.
Figure 7: Lamp filament voltage during the
preheat, ignition ramp and run modes.
0
50
100
150
0
5
10
15
20
25
30
35
40
RT (K ohms)
FREQ
(KHz)
CT=220pF,RDT=11K
CT=470pF,RDT=6.2K
CT=1nF,RDT=3K
0
50
100
150
200
250
0
5
10
15
20
25
30
35
40
RT (K ohms)
FREQ
(KHz)
CT=220pF, RDT=5.6K
CT=470pF, RDT=2.7K
CT=1nF, RDT=1.2K
Preheat
Run
Ignition
Ramp
PH
t
PH
PH
9
PH
C
-
213E
or
,
C
4.7E6
=
t
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相关代理商/技术参数 |
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|---|---|
| IR21571PBF | 功能描述:功率驱动器IC Ballast Cntrl Thrml Ovrload Prot RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| IR21571PBF | 制造商:International Rectifier 功能描述:Controller IC Output Voltage Max.:25V |
| IR21571S | 功能描述:IC BALLAST CONTROL 16-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 照明，镇流器控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:CCFL 控制器 频率:40 ~ 80 kHz 电流 - 电源:5mA 电流 - 输出:- 电源电压:4.5 V ~ 5.5 V 工作温度:-40°C ~ 85°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) 其它名称:90-3991V+V01 |
| IR21571SPBF | 功能描述:功率驱动器IC BALLAST CTRL BELO 600V 15.6V VCC 150uA RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| IR21571STR | 功能描述:IC BALLAST CONTROL INTEG 16-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 照明，镇流器控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:CCFL 控制器 频率:40 ~ 80 kHz 电流 - 电源:5mA 电流 - 输出:- 电源电压:4.5 V ~ 5.5 V 工作温度:-40°C ~ 85°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) 其它名称:90-3991V+V01 |
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