参数资料
| 型号： | MAX1801EKA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR DC-DC SOT23-8 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 控制器，数字式相机 |
| 输入电压： | 2.7 V ~ 5.5 V |
| 输出数： | 1 |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-8 |
| 供应商设备封装： | SOT-23-8 |
| 包装： | 带卷 (TR) |
Digital Camera Step-Up Slave
DC-DC Controller
(P O / P C ) = (A DC / A(P O ))
Solving this equation for C C :
PC
180 °
C C = V OUT (C OUT )3/2 ESR2 / (20M ? V IN (L) 1/2 )
A VDC
PHASE
GAIN
6) Determine that the compensation resistor, R C for
the compensation zero frequency, is equal to the
complex pole-pair frequency:
GAIN
(dB)
Z C =P O
PHASE
90 °
PHASE
Z C = P O
solving for R C :
R C = (V IN / V OUT ) ((L C OUT ) 1/2 / C C )
O dB
MARGIN
Z 0
GAIN
MARGIN
0 °
Applications Information
Z rRHP
FREQUENCY
Figure 5. MAX1801 Continuous-Current, Voltage-Mode,
Step-Up Converter Bode Plot
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:
Using the MAX1801 with the MAX1800
Step-Up Master DC-DC Converter
The MAX1801 does not generate its own reference or
oscillator. Instead it uses the reference and the oscillator
from a master DC-DC converter such as the MAX1800
step-up master converter. The MAX1800 has circuitry to
generate a 1.25V reference and a 100kHz to 1MHz oscil-
lator signal. The MAX1800 operates from a 1.5V to 5.5V
input voltage, which makes it suitable for applications
with 2- or 3-cell alkaline, NiCd, or NiMH batteries, or 1-cell
lithium primary or lithium-ion (Li+) batteries. Apart from
the reference and the oscillator, the MAX1800 has a sin-
gle-internal-switch synchronous-rectified step-up DC-DC
converter, three auxiliary step-up DC-DC converter con-
trollers, and a linear regulator controller. For more details,
(1- D) R LOAD
Z RHP =
2
2 π L
refer to the MAX1800 data sheet
Using the MAX1801 with the MAX1802
Step-Down Master DC-DC Converter
2) Find the DC loop gain:
A VDC = 2000 V OUT V IN
3) Determine the frequency of the complex pole pair
due to the inductor and output capacitor:
f O = (V OUT / V IN ) / (2 π (L C OUT )1/2)
4) Since response is 2nd order (-40dB per decade)
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 / P O )2 = L V IN 2 / (C OUT ESR2 V OUT 2)
5) Determine the desired compensation pole. Since
the response between the compensation pole and
the complex pole pair is 1st order (-20dB per
decade), the ratio of the frequencies is equal to the
ratio of the amplitudes at those frequencies. Thus:
The MAX1801 does not generate its own reference or
oscillator. Instead, it uses the reference and the oscilla-
tor from a master DC-DC converter such as the
MAX1802 step-down master DC-DC converter. The
MAX1802 has circuitry to generate a 1.25V reference
and a 100kHz to 1MHz oscillator signal. The MAX1802
operates from a 2.7V to 11V input voltage, making it
suitable for 4-series alkaline, NiCd, or NiMH cells, or 2-
series lithium primary or (Li+) batteries. The MAX1802
has a synchronous-rectified step-down DC-DC convert-
er controller, an internal-switch synchronous-rectified
step-down DC-DC converter, and three auxiliary step-
up DC-DC converter controllers. For more details, refer
to the MAX1802 data sheet.
______________________________________________________________________________________
13
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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+ | 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 |
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