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IMP38C42EMA/T PDF预览

IMP38C42EMA/T

更新时间： 2024-02-11 09:42:00
品牌 Logo 应用领域
A1PROS 信息通信管理开关光电二极管
页数 文件大小 规格书
10页 160K
描述
Switching Regulator/Controller, Current-mode, 0.5A, BICMOS, PDSO8

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IMP38C42EMA/T 技术参数

生命周期：Obsolete零件包装代码：TSSOP
包装说明：TSSOP,针数：8
Reach Compliance Code：unknownECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.84
模拟集成电路 - 其他类型：SWITCHING CONTROLLER控制模式：CURRENT-MODE
控制技术：PULSE WIDTH MODULATION最大输入电压：2.55 V
最小输入电压：2.45 V标称输入电压：2.5 V
JESD-30 代码：R-PDSO-G8长度：3 mm
功能数量：1端子数量：8
最高工作温度：85 °C最低工作温度：-40 °C
最大输出电流：1 A封装主体材料：PLASTIC/EPOXY
封装代码：TSSOP封装形状：RECTANGULAR
封装形式：SMALL OUTLINE认证状态：Not Qualified
座面最大高度：1.1 mm表面贴装：YES
切换器配置：PUSH-PULL最大切换频率：1000 kHz
技术：BICMOS温度等级：INDUSTRIAL
端子形式：GULL WING端子节距：0.65 mm
端子位置：DUAL宽度：3 mm
Base Number Matches：1

IMP38C42EMA/T 数据手册

 浏览型号IMP38C42EMA/T的Datasheet PDF文件第3页浏览型号IMP38C42EMA/T的Datasheet PDF文件第4页浏览型号IMP38C42EMA/T的Datasheet PDF文件第5页浏览型号IMP38C42EMA/T的Datasheet PDF文件第7页浏览型号IMP38C42EMA/T的Datasheet PDF文件第8页浏览型号IMP38C42EMA/T的Datasheet PDF文件第9页 
IMP38C/HC/42/3/4/5  
Application Information  
The IMP38C and IMP38HC devices are compatible with generic  
384x PWM devices. The following discussion highlights the dif-  
ferences and advantages of the IMP ‘C’ and ‘HC’ designs.  
Transient Protection  
Good high-frequency layout practices should be followed. Avoid  
long printed-circuit traces and component leads. Locate oscillator  
and compensation components near the IC. Avoid capacitive and  
inductive coupling of the switching waveform into the  
high-impedance inputs of the error amplifier, oscillator, and  
current-sense amplifier. VREF and VCC stability will be aided by  
using high-frequency decoupling capacitors.  
Start-up Current  
IMP’s BiCMOS process allows for substantial reduction in the  
start-up current. Typical start-up current is 95µA, with a maxi-  
mum limit of 120µA. Low start-up current allows high resistance,  
lower-wattage, start-up resistors to supply controller start-up  
power.  
Undervoltage Lockout  
Several different thresholds are available.  
Operating Current  
Undervoltage Lockout Thresholds  
Operating current has been reduced to 1.5mA maximum.  
Compared to the 11mA needed for a typical bipolar controller and  
6mA for competitive BiCMOS controllers, IMP's low operating  
current allows the controller to run cooler and with better effi-  
ciency. In addition, the VCC hold-up capacitance (used during  
start-up) can be reduced.  
Start-up at 8.4V  
Operating Minimum = 7.6V  
Start-up at 14.5V  
Operating Minimum = 9.0V  
IMP38C43/HC43  
IMP38C45/HC45  
IMP38C42/HC42  
IMP38C44/HC44  
38C/HC_t04.eps  
Under-voltage lockout (UVL) performance has been improved.  
When the power supply voltage is below the startup voltage,  
internal circuitry puts the output into a low impedance state and  
sets the output to zero. The output will sink up to 20mA in this  
controlled state and remain below 1.3V, well below the turn-on  
threshold voltage of the external MOSFET.  
Output Driver  
The IMP38HC4x/38C4x CMOS output stage drives external  
power MOSFETs to the full supply voltage. Low ON-resistance  
and high peak current drive combine to give greater than 1000pF  
gate capacitance drive capability. Rise and fall time requirements  
may dictate the appropriate value of output capacitance. Within  
the restrictions of output capacity and controller power dissipa-  
tion, switching frequencies can exceed 1MHz.  
With the IMP38C/HC4x output stage design, leakage current  
from the external power MOSFETs will not force the PWM output  
to rise and turn the external MOSFET on.  
The CMOS output stage “break-before-make” action is guaran-  
teed by design and insures that no cross-conduction current will  
flow. This minimizes heat dissipation, increases efficiency and  
enhances reliability.  
Even when VDD drops to zero volts, the OUT pin will not rise  
above approximately 1.3V because the UVLO circuit is powered  
through the OUT pin.  
The IMP output stage performance in UVL mode, while sinking  
20mA, is shown in Figure 2.  
Oscillator Operation  
Two external components, RT and CT, set the switching frequency.  
With VCC = 14V, RT = 10k and CT = 3.3nF, nominal switching  
frequency is 50kHz.  
VOUT While Sinking 20mA  
2.0  
IMP38C/HC4x  
VREF  
1.5  
1.0  
0.5  
0
IMP38C4x  
RT  
IMP38HC4x  
RT/CT  
1.73  
frequency Hz =  
[
]
RT Ω × CT F  
[
]
[ ]  
CT  
GND  
38C/HC_07.eps  
0
1
2
3
4
5
6
7
8
9
VDD (V)  
38C/HC_05b.eps  
Figure 1. Oscillator Component Selection  
Figure 2. Output Stage Performance in UVL Mode  
!S  
6
408-432-9100/www.impweb.com  
© 2000 IMP, Inc.  
1...345678910

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