六.电路原理图
七,功能概述
As seen in Functional Block Diagram, the JTM4523 is a peak current mode pulse width modulation
(PWM) converter with CC and CV control. The converter operates as follows: A switching cycle
starts when the rising edge of the Oscillator clock output causes the High-Side Power Switch to turn
on and the Low-Side Power Switch to turn off. With the SW side of the inductor now connected to IN,
the inductor current ramps up to store energy in the magnetic field. The inductor current level is
measured by the Current Sense Amplifier and added to the Oscillator ramp signal. If the resulting
summation is higher than the COMP voltage, the output of the PWM Comparator goes high. When
this happens or when Oscillator clock output goes low, the High-Side Power Switch turns off. At this
point, the SW side of the inductor swings to a diode voltage below ground, causing the inductor current
to decrease and magnetic energy to be transferred to output. This state continues until the cycle starts
again. The High-Side Power Switch is driven by logic using HBS as the positive rail. This pin is
charged to VSW + 5V when the Low-Side Power Switch turns on. The COMP voltage is the
integration of the error between FB input and the nternal 0.8V reference voltage. If FB is lower than
the reference voltage, COMP tends to go higher to increase current to the output. Output current will
increase until it reaches the CC limit set by the ISET resistor. At this point, the device will transition
from regulating output voltage to regulating output current, and the output voltage will drop with
increasing load. The Oscillator normally switches at 225-KHz. However, if FB voltage is less than 0.6V,
then the switching frequency decreases until it reaches a typical value of 30kHz at VFB = 0.15V.
八,相关产品
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DC-DC降压IC |
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型号 |
输入耐压 |
输出电压 |
输出电流 |
反馈电压 |
工作频率 |
效率 |
静态 |
待机电流 |
封装 |
直接替换 |
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工作电流 |
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LM2596 |
45V |
5.0V/可调输出 |
3A |
1.23V |
150K |
90% |
10mA |
80uA |
TO-263-5L |
LM2596/AP1501 |
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/3.3/12V |
(Max) |
TO-220-5L |
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LM2576 |
45V |
5.0V/可调输出 |
3A |
1.23V |
50K |
90% |
10mA |
80uA |
TO-263-5L |
LM2576 |
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/3.3/12V |
(Max) |
TO-220-5L |
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JTM1507 |
45V |
5.0V/可调输出 |
3A |
1.23V |
380K |
73% |
2mA |
0.2uA |
TO-252-5L |
AP1507 |
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MP1410 |
27V |
可调输出 |
2A |
1.22V |
420K |
95% |
1mA |
25uA |
SOP8 |
MP1410/ACT4060 |
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MP9141/RT826 |
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AP1534 |
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JTM1509 |
45V |
5.0V/可调输出 |
2A |
1.23V |
150K |
82% |
2mA |
80uA |
SOP8 |
AP1509 |
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3.3V/12V |
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JTM1513 |
20V |
可调输出 |
2A |
0.8V |
150K |
89% |
2mA |
1uA |
SOP-8 |
AP1513 |
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JTM1530 |
20V |
可调输出 |
3A |
0.8V |
380K |
88% |
3mA |
1uA |
SOP-8 |
AP1510 |
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JTM1583 |
28V |
可调输出 |
3A |
1.22V |
380K |
89% |
3mA |
1uA |
SOP-8 |
MP1583 |
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JTM3111 |
42V |
可调输出 |
3A |
0.8V |
50-500K |
91% |
3mA |
150uA |
ESOP8 |
AX3111 |
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JTM3112 |
40V |
可调输出/ |
2A |
1.18V |
110K |
93% |
10mA |
2mA |
SOP8 |
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带CC/CV模式 |
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JTM3113B |
40V |
可调输出/ |
2.5A |
1.0V |
250K |
91% |
10mA |
2mA |
ESOP8 |
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带CC/CV模式 |
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JTM3101 |
45V |
可调输出/ |
2A |
1.235V |
150K |
83% |
2.0mA |
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ESOP8 |
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带CC模式 |
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JTM3102 |
45V |
可调输出/ |
3A |
1.25V |
150K |
89% |
2.0mA |
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ESOP8 |
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带CC模式 |
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JTM3109 |
40V |
可调输出/ |
3A |
1.25V |
180K |
89% |
2.1mA |
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SOP8 |
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带CC/CV模式 |
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JTM3108 |
40V |
可调输出/ |
3.5A |
1.25V |
180K |
87% |
2.1mA |
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ESOP8 |
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带CC/CV模式 |
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JTM4523 |
40V |
可调输出/ |
3A |
0.8V |
225K |
92% |
2.84mA |
75uA |
ESOP8 |
AC4523/F5335 |
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带CC/CV模式 |
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JTM3501 |
50V |
5V固定输出 |
1.8A |
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150K |
90% |
4.7mA |
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SOP-8 |
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JTM3511 |
50V |
5V固定输出 |
2.1A |
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150K |
90% |
4.7mA |
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SOP-8 |
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JTM3512 |
50V |
5V固定输出 |
2.4A |
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150K |
89% |
4.7mA |
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SOP-8 |
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JTM3513 |
50V |
5V固定输出 |
3.2A |
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150K |
87% |
4.7mA |
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TO-252-5L |
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大电流DC-DC降压IC |
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型号 |
输入耐压 |
输出电压 |
输出电流 |
反馈电压 |
工作频率 |
效率 |
静态工作电流 |
待机电流 |
封装 |
直接替换 |
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JTM3103 |
40V |
可调输出 |
4A |
1.25V |
180K |
94% |
2.1mA |
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TO-252-5L |
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JTM3104 |
36V |
可调输出 |
5A |
1.22V |
240K |
95% |
3.6mA |
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TO-263-5L |
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JTM3105 |
40V |
可调输出 |
5A |
1.25V |
180K |
96% |
2.1mA |
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TO-263-5L |
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JTM3115 |
40V |
可调输出 |
5A |
1.25V |
150K |
86% |
2mA |
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TO-263-5L |
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带CC/CV模式 |
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耐高压DC-DC降压IC |
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型号 |
输入耐压 |
输出电压 |
输出电流 |
反馈电压 |
工作频率 |
效率 |
静态工作电流 |
待机电流 |
封装 |
直接替换 |
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JTM3107 |
75V |
可调输出 |
1.2A |
1.25V |
180K |
92% |
3mA |
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SOP8 |
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JTM3107B |
85V |
可调输出 |
0.4A |
1.25V |
150K |
85% |
2.5mA |
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SOP8 |
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JTM3110 |
93V |
可调输出 |
1A |
1.25V |
150K |
83% |
4.5mA |
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TO252-5L |
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JTM3110B |
85V |
可调输出 |
0.8A |
1.25V |
150K |
85% |
2.5mA |
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TO252-5L |
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我司的LM2596有如下优点： |
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1.最大可达3.5A-4A驱动电流 |
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2.耐压可达45V. |
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3.和市场低端的那种只有1A电流的不同。 |
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我司的LM2576有如下优点： |
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1.最大可达3A驱动电流 |
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2.耐压可达45V. |
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3.和市场低端的那种只有1A电流的不同。 |
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(责任编辑：oumao18) |
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