参数资料
| 型号： | ZXSC440X8TA |
| 厂商： | Diodes Inc |
| 文件页数： | 5/11页 |
| 文件大小： | 0K |
| 描述： | IC PHOTOFLASH CHARGER 8MSOP |
| 产品变化通告： | End of Life 16/Sept/2011 |
| 标准包装： | 1 |
| 应用： | 照相机闪光灯电容器充电器 |
| 电流 - 电源： | 220µA |
| 电源电压： | 1.8 V ~ 8 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 标准包装 |
| 产品目录页面： | 1478 (CN2011-ZH PDF) |
| 其它名称： | ZXSC440X8DKR |
ZXSC440
PHOTOFLASH CHARGER
Application Information
Switching Transistor Selection
The choice of switching transistor has a major impact on
the converter efficiency. For optimum performance, a
bipolar transistor with low V CE(SAT) and high gain is
required. The V CEO of the switching transistor is also an
important parameter as this sees typically three times the
input voltage when the transistor is switched off. Zetex
SuperSOT? transistors are an ideal choice for this
application. At input voltages above 4V, suitable Zetex
MOSFET transistors will give almost the same
performance with a simpler drive circuit, omitting the
ZXTD6717 pre-drive stage. Using a MOSFET, the
Schottky diode may be omitted, as the body diode of the
MOSFET will perform the same function, with just a small
loss of efficiency.
Therefore, with a 300V output, a supply of 8 volts and a
1:12 step-up transformer, there will be a 396V across the
diode. This occurs during the current ramp-up in the
primary, as it transforms the input voltage up by the turns
ratio and the polarity at the secondary is such as to add to
the output voltage already being held off by the diode.
Peak Current Definition
In general, the I PK value must be chosen to ensure that
the switching transistor, Q1, is in full saturation with
maximum output power conditions, assuming worse-case
input voltage and transistor gain under all operating
temperature extremes. Once I PK is decided the value of
R SENSE can be determined by:
Output Rectifier Diode Selection
The diode should have a fast recovery, as any time spent
R SENSE =
V SENSE
I PK
in reverse conduction removes energy from the reservoir
capacitor and dumps it, via the transformer, into the
protection diode across the output transistor.
This seriously reduces efficiency. Two BAS21 diodes in
series have been used, bearing in mind that the reverse
voltage across the diode is the sum of the output voltage
together with the input voltage multiplied by the step-up
ratio of the transformer:
V R(DIODE) = V OUT(MAX) + (V IN x T URNS R ATIO )
Sense Resistor
A low value sense resistor is required to set the peak
current. Power in this resistor is negligible due to the low
sense voltage threshold, V SENSE . Below is a table of
recommended sense resistors:
Manufacturer
Cyntec
IRC
Series
RL1220
LR1206
R DC ( ? ) Range
0.022 - 10
0.010 – 1.0
Size
0805
1206
Tolerance
±5%
±5%
Using a 22m ? sense resistor results in a peak current of just over 1.2A.
Transformer Parameters
Proprietary transformers are available, for example the
Pulse PAO367, Primary inductance: 24μH, Core: Pulse
PAO367, Turns ratio: 1:12, see Bill of Materials below. If
designing a transformer, bear in mind that the primary
current may be over an amp and, if this flows through 10
ZXSC440 Transformer Specifications
turns, the primary flux will be 10 Amp. Turns and small
cores will need an air gap to cope with this value without
saturation. Secondary winding capacitance should not be
too high as this is working at 300V and could soon cause
excessive losses.
Part No.
T-15-089
T-15-083
SBL-5.6-1
Size
(WxLxH) mm
6.4x7.7x4
8x8.9x2
5.6x8.5x4
L PRI
(μH)
12
20
10
L PRI-LEAK
(nH)
400
500
200
N
10:2
10:2
10:2
R PRI
(m ? )
211
675
103
R SEC
( ? )
27
35
26
PAO367
9.1x9.1x5.1
24
12:1
ZXSC440
Document number: DS33619 Rev. 3 - 2
5 of 11
June 2012
? Diodes Incorporated
相关PDF资料 |
PDF描述 |
|---|---|
| ACCESS-TOUCH-SS | IC CTRLR TOUCH KEYED 20-SSOP |
| AD1362KD | IC CONV 16CH 32-CDIP |
| 100-1215-1 | MODULE ECM-BF561-C-I-Q25S128F32 |
| 100-1221-3 | CORE MOD CM-BF537E 600MHZ CONN |
| 100-1225-1 | CORE MOD TCM-BF537 500MHZ CONN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ZXSC440X8TC | 制造商:ZETEX 制造商全称:ZETEX 功能描述:PHOTOFLASH CHARGER |
| ZXSDS2M832 | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
| ZXSDS2M832TA | 功能描述:肖特基二极管与整流器 VR=60V IF=1.65A IR=100uA RoHS:否 制造商:Skyworks Solutions, Inc. 产品:Schottky Diodes 峰值反向电压:2 V 正向连续电流:50 mA 最大浪涌电流: 配置:Crossover Quad 恢复时间: 正向电压下降:370 mV 最大反向漏泄电流: 最大功率耗散:75 mW 工作温度范围:- 65 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:SOT-143 封装:Reel |
| ZXSDS2M832TC | 制造商:ZETEX 制造商全称:ZETEX 功能描述:MPPS Miniature Package Power Solutions |
| ZXSF11 | 制造商:OMRON AUTOMATION AND SAFETY 功能描述:COMMUNICATION INTERFACE RS232 制造商:OMRON INDUSTRIAL AUTOMATION 功能描述:COMMUNICATIONS INTERFACE UNIT |
发布紧急采购，3分钟左右您将得到回复。