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| 型号： | MAX1802EHJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 25/28页 |
| 文件大小： | 0K |
| 描述： | IC PWR SPLY STEP DOWN 32-TQFP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 360 |
| 应用： | 控制器，数字式相机 |
| 输入电压： | 2.5 V ~ 11 V |
| 输出数： | 5 |
| 输出电压： | 1.25 V ~ 5.5 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-TQFP |
| 供应商设备封装： | 32-TQFP（5x5） |
| 包装： | 托盘 |
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Digital Camera Step-Down
Power Supply
4) Since response is 2nd order (-40dB per decade)
40
A VDC
30
P C
PHASE
GAIN
180 °
between the complex pole pair and the ESR zero,
determine the desired amplitude at the complex
pole pair to force the crossover frequency equal to
the ESR zero frequency. Thus:
A ( P O ) = ( Z O O ) =
C OUT ESR V OUT 2
GAIN
(dB)
20
Z C = P O
90 °
PHASE
/ P
2
L V IN 2
2
10
PHASE
5) Determine the desired compensation pole. Since
0
MARGIN
Z 0
GAIN
MARGIN
0 °
the response between the compensation pole and
the complex pole pair is 1st order (-20dB per
-10
Z RHP
FREQUENCY
decade), the ratio of the frequencies is equal to the
ratio of the amplitudes at those frequencies. Thus:
Figure 8. Continuous-Current, Voltage-Mode, Step-Up
Converter Bode Plot
P O
P C
=
A DC
A ( P O )
The frequency (in Hz) of the zero due to the ESR of the
Solving this equation for C C :
V OUT ( C OUT )
E SR 2
20 M ? V IN ( L )
output capacitor is:
Z O =
1
2 π C OUT E SR
C C =
3 / 2
1 / 2
and the right-half-plane zero frequency (in Hz) is:
6) Determine R C for the compensation zero frequency
as equal to the complex pole-pair frequency:
Z RHP =
( 1-D ) 2 R LOAD
2 π L
Z C = P O .
Solving for R C :
Figure 8 shows the Bode plot of the loop gain of this
control circuit.
R C =
V IN LC OUT
V OUT C C
( 1-D ) 2 R LOAD
2 π L
To configure the compensation network for a stable
control loop, set the crossover frequency at that of the
zero due to the output capacitor ESR. Use the following
procedure:
1) Determine the frequency of the right-half-plane
zero:
Z RHP =
2) Find the DC loop gain:
Applications Information
Using the MAX1801 with the MAX1802
Step-Down Master
The MAX1801 is a slave DC-DC controller that can be
used with the MAX1802 to generate additional output
voltages. The MAX1801 does not generate its own ref-
erence or oscillator. Instead it uses the reference and
oscillator from the MAX1802 step-down master convert-
er controller (Figure 1). MAX1801 controller operation
A VDC =
2000V OUT
V IN
and design is similar to that of the MAX1802 auxiliary
controllers. For more details, refer to the MAX1801 data
sheet.
3) Determine the frequency of the complex pole pair
due to the inductor and output capacitor:
Using an Auxiliary Controller in an
SEPIC Configuration
f O =
V OUT
2 π V IN LC OUT
Where the battery voltage may be above or below the
required output voltage, neither a step-up nor a step-
down converter is suitable; instead, use a step-up/step-
down converter. One type of step-up/step-down
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相关代理商/技术参数 |
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|---|---|
| MAX1802EHJ+ | 功能描述:直流/直流开关转换器 Step-Up Slave DC/DC Controller RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1802EHJ+T | 功能描述:直流/直流开关转换器 Step-Up Slave DC/DC Controller RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1802EHJ-T | 功能描述:直流/直流开关转换器 Step-Up Slave DC/DC Controller RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1804EUB | 功能描述:电流和电力监控器、调节器 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX1804EUB+ | 功能描述:电流和电力监控器、调节器 Feedback Integrator for Power Supply RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
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