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参数资料
| 型号： | KIT34713EPEVBE |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 17/23页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL BOARD 5A 1MHZ |
| 标准包装： | 1 |
| 系列： | * |
TYPICAL APPLICATIONS
BOOT
C BOOT
In order to find the maximum allowed ESR,
F SW
Gate
Driver
SW
VOUT
R S
L
R O
C O
Ramp
Generator
PWM
Comparitor
Error
Amplifier
INV
COMP
C S
C X
R F
C F
R B
V O = V REF ? ? ? ?
R O
The effects of the ESR is often neglected by the designers
and may present a hidden danger to the ultimate supply
stability. Poor quality capacitors have widely disparate ESR
value, which can make the closed loop response
V REFIN
V DDI
Bandgap
Regulator
Reference
Selection
34713
------- + 1
R B
inconsistent.
Figure 9. Type III Compensation Network
Consider the crossover frequency, F CROSS , of the open loop
Io
gain at one-tenth of the switching frequency, F SW.
Then,
F CROSS = ----------------------------
Io_step
Current
response
10
2 π ? RO CF
?
C F = ---------------------------------------
dt_I_rise
Worst case
assumption
10
2 π ? R O F CROSS
where R O is a user selected resistor. Knowing the LC
frequency, it can be obtained the values of R F and C S :
Figure 8. Transient Parameters
TYPE III COMPENSATION NETWORK
Power supplies are desired to offer accurate and tight
regulation output voltages. To accomplish this requires a high
DC gain. But with high gain comes the possibility of instability.
The purpose of adding compensation to the internal error
amplifier is to counteract some of the gains and phases
contained in the control-to-output transfer function that could
jeopardized the stability of the power supply. The Type III
compensation network used for 34713 comprises two poles
(one integrator and one high frequency pole to cancel the
zero generated from the ESR of the output capacitor) and two
zeros to cancel the two poles generated from the LC filter as
shown in Figure 9 .
This gives as a result,
&
Calculate Rs by placing the Pole 1 at the ESR zero
frequency:
34713
Analog Integrated Circuit Device Data
Freescale Semiconductor
17
相关PDF资料 |
PDF描述 |
|---|---|
| KIT34716EPEVBE | KIT EVAL BOARD 1MHZ DUAL SW-MODE |
| KIT34717EPEVBE | KIT EVAL BOARD 5A 1.0MHZ |
| KS-1787-MG | SHELF SLIDING KEYBOARD ASSEMBLY |
| KS-1788 | SHELF SLIDING KEYBOARD ASSEMBLY |
| KSDKSTM32-PL | KIT IAR KICKSTART STM32 CORTEXM3 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| KIT34716EPEVBE | 功能描述:电源管理IC开发工具 1.0 MHZ DUAL SWITCH-MODE RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| KIT34717EPEVBE | 功能描述:电源管理IC开发工具 5.0 A 1.0MHZ FULLY INTEG RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| KIT34727FCEVBE | 功能描述:电源管理IC开发工具 600MA HIGH EFFICIENCY LO RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| KIT34825EPEVME | 功能描述:界面开发工具 MICRO USB INTERFACE IC RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
| KIT34844AEPEVBE | 功能描述:LED 照明开发工具 IC, 10 CHANNEL LED BACKLIGHT RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
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