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| 型号： | LT8582IDKD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 27/36页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG ADJ 3A 24DFN |
| 标准包装： | 2,500 |
| 类型： | 升压（升压），反相，回扫，Sepic |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 最高 42V |
| 输入电压： | 2.5 V ~ 22 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz ~ 2.5MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 24-DFN（7x4） |
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LT8582
APPENDIX
Table 7 shows a list of several discrete PMOS manufactur-
ers. Consult the manufacturers for detailed information
on their entire selection of PMOSs.
Table 7. Discrete PMOS Manufacturers
V OUT
AC-COUPLED
500mV/DIV
I L
Vishay
ON Semiconductor
www.vishay.com
www.onsemi.com
1A/DIV
I LOAD
Fairchild Semiconductor
www.fairchildsemi.com
400mA/DIV
100μs/DIV
8582 F14b
Diodes Incorporated
www.diodes.com
Figure 14b. Transient Response Is Better
COMPENSATION – ADJUSTMENT
To compensate the feedback loop of the LT8582, a series
resistor capacitor network in parallel with an optional
single capacitor should be connected from the V C pin to
GND. For most applications, choose a series capacitor in
the range of 1nF to 10nF with 2.2nF being a good start-
ing value. The optional parallel capacitor should range in
V OUT
AC-COUPLED
500mV/DIV
I L
1A/DIV
value from 22pF to 220pF with 47pF being a good starting
value. The compensation resistor, R C , is usually in the
range of 5k to 50k with 10k being a good starting value.
I LOAD
400mA/DIV
100μs/DIV
8582 F14c
A good technique to compensate a new application is to
use a 100k potentiometer in place of the series resistor
R C . With the series and parallel capacitors at 4.7nF and
47pF respectively, adjust the potentiometer while observ-
ing the transient response and the optimum value for R C
can be found. Figures 14a to Figure 14c illustrate this
process for the circuit of Figure 17 with a load current
stepped between 300mA and 800mA. Figure 14a shows
the transient response with R C equal to 1k. The phase
margin is poor as evidenced by the excessive ringing in
the output voltage and inductor current. In Figure 14b, the
value of R C is increased to 3.15k, which results in a more
damped response. Figure 14c shows the results when R C is
increased further to 6.49k. The transient response is nicely
damped and the compensation procedure is complete.
V OUT1
AC-COUPLED
500mV/DIV
I L1
1A/DIV
Figure 14c. Transient Response Is Well Damped
Compensation – Theory
Like all other current mode switching regulators, the
LT8582 needs to be compensated for stable and efficient
operation. Two feedback loops are used in the LT8582: a
fast current loop which does not require compensation
and a slower voltage loop which does. Standard bode plot
analysis can be used to understand and adjust the voltage
feedback loop.
As with any feedback loop, identifying the gain and phase
contribution of the various elements in the loop is critical.
Figure 15 shows the key equivalent elements of a boost
converter. Because of the fast current control loop, the
power stage of the chip, inductor and diode have been
replaced by a combination of the equivalent transcon-
ductance amplifier g mp and the current controlled current
source (which converts I VIN to ( η V IN /V OUT ) ? I VIN ). g mp
acts as a current source where the peak input current,
I VIN , is proportional to the V C voltage. η is the efficiency
I LOAD
400mA/DIV
100μs/DIV
8582 F14a
of the switching regulator and is typically about 88% at
higher currents.
Figure 14a. Transient Response Shows Excessive Ringing
8582f
27
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT8584IFE#PBF | 制造商:Linear Technology 功能描述:IC BATT CELL BALANCE 16TSSOP 制造商:Linear Technology 功能描述:BATTERY BALANCER, 2.5V-5.3V, TSSOP-16, Supply Voltage Min:2.5V, Supply Voltage M |
| LT8610 | 制造商:LINER 制造商全称:Linear Technology 功能描述:42V, 2.5A Synchronous Step-Down Regulator |
| LT8610ABEMSE#PBF | 制造商:Linear Technology 功能描述:SWITCHING REG, BUCK, ADJ, 2.2MHZ, MSOP16, Primary Input Voltage:42V, No. of Outp |
| LT8610AEMSE#PBF | 制造商:Linear Technology 功能描述:IC REG BUCK SYNC ADJ 2.5A 16MSOP 制造商:Linear Technology 功能描述:SWITCHING REG, BUCK, ADJ, 2.2MHZ, MSOP16, Primary Input Voltage:42V, No. of Outp |
| LT8610AHMSE#PBF | 制造商:Linear Technology 功能描述:IC REG BUCK SYNC ADJ 2.5A 16MSOP 制造商:Linear Technology 功能描述:SWITCHING REG, BUCK, ADJ, 2.2MHZ, MSOP16 制造商:Linear Technology 功能描述:SWITCHING REG, BUCK, ADJ, 2.2MHZ, MSOP16, Primary Input Voltage:42V, No. of Outp |
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