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参数资料
| 型号： | MAX15049ETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 22/31页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM STP-DN TRIPL 32WQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 应用： | 电源控制器，序列发生器 |
| 电源电压： | 4.7 V ~ 23 V |
| 电流 - 电源： | 6mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 管件 |
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MAX15048/MAX15049
Triple-Output Buck Controllers
with Tracking/Sequencing
Below are equations that define the power modulator:
especially the output capacitor. For cost-sensitive appli-
G MOD(DC) =
V IN
V RAMP
cations, use aluminum electrolytic capacitors; for space-
sensitive applications, use low ESR tantalum or multilayer
ceramic chip (MLCC) capacitors at the output. The higher
switching frequencies of the MAX15048/MAX15049 allow
f LC =
1
2 π × L × C OUT
the use of MLCC as the primary filter capacitor(s).
First, select the passive and active power compo-
nents that meet the application’s output ripple, compo-
nent size, and component cost requirements. Second,
f ZERO, ESR =
1
2 π × ESR × C OUT
choose the small-signal compensation components to
achieve the desired closed-loop frequency response
and phase margin as outlined below.
f ZERO, ESL =
ESR
2 π × ESL
Closed-Loop Response and Compensation
of Voltage-Mode Regulators
The power modulator’s LC lowpass filter exhibits a vari-
ety of responses, depending on the value of L and C
The switching frequency is programmable between
200kHz and 1.2MHz using an external resistor at RT.
Typically, the crossover frequency (f CO ), which is the
frequency when the system’s closed-loop gain is equal
to unity, crosses the 0dB axis, and should be set at or
below 1/10 the switching frequency (f SW /10) for stable,
closed-loop response.
The MAX15048/MAX15049 provide an internal transcon-
ductance amplifier with its inverting input and its output
available to the user for external frequency compensation.
The flexibility of external compensation for each con-
verter offers wide selection of output-filtering components,
40
f LC
20
(and their parasitics).
One such response is shown in Figure 4a. In this exam-
ple, the power modulator’s uncompensated crossover
is approximately 1/6 the desired crossover frequency,
f CO . Note also, the uncompensated rolloff through 0dB
plane follows the double-pole, -40dB/decade slope and
approaches 180° of phase shift, indicative of a poten-
tially unstable system. Together with the inherent 180° of
phase delay in the negative feedback system, this can
lead to near 360°, or “positive” feedback—an unstable
system.
90
45
0
-20
-40
|G MOD | ASYMPTOTE
< G MOD
f ZERO, ESR
|G MOD |
0
-45
-90
f ZERO, ESL
-60
-80
FREQUENCY (Hz)
Figure 4a. Power Modulator Gain and Phase Response (Large, Bulk C OUT )
22
-135
-180
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15049ETJ+ | 功能描述:DC/DC 开关控制器 1.2MHz Triple Buck w/Tracking RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX15049ETJ+ | 制造商:Maxim Integrated Products 功能描述:IC BUCK CNTRL TRIPLE 32WQFN 制造商:Maxim Integrated Products 功能描述:IC, BUCK, CNTRL, TRIPLE, 32WQFN |
| MAX15049ETJ+ | 制造商:Maxim Integrated Products 功能描述:IC PWM STEP-DOWN DC/DC CONVER |
| MAX15049ETJ+T | 功能描述:DC/DC 开关控制器 1.2MHz Triple Buck w/Tracking RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX15049EVKIT+ | 功能描述:电源管理IC开发工具 MAX15049 Eval Kit 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 |
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