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| 型号： | MAX15002ATL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/29页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 40-TQFNEP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 2.2MHz |
| 电源电压： | 5.5 V ~ 23 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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MAX15002
Dual-Output Buck Controller with
Tracking/Sequencing
Below are equations that define the power modulator:
First, select the passive and active power components
that meet the application’s output ripple, component
VIN
= IN
G MOD ( DC ) =
VRAMP
≈
2 π L × COUT × ? OUT
f LC =
1 1
?
? ROUT + DCR ?
V
2 V
? R + ESR ? 2 π L × COUT
size, and component cost requirements. Second,
choose the small-signal compensation components to
achieve the desired closed-loop frequency response
and phase margin as outlined below.
Closed-Loop Response and Compensation
of Voltage-Mode Regulators
f ESR =
1
2 π × ESR × COUT
The power modulator’s LC lowpass filter exhibits a vari-
ety of responses, depending on the value of the L and
C (and their parasitics).
The switching frequency is programmable between
200kHz and 2.2MHz 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)—should be set at or
below one-tenth the switching frequency (f SW /10) for
stable, closed-loop response.
The MAX15002 provides an internal transconductance
amplifier with its inverting input and its output available
to the user for external frequency compensation. The
flexibility of external compensation for each converter
offers wide selection of output filtering components,
especially the output capacitor. For cost-sensitive appli-
cations, use aluminum electrolytic capacitors and for
space-sensitive applications, use low-ESR tantalum or
multilayer ceramic chip (MLCC) capacitors at the out-
put. The higher switching frequencies of the MAX15002
allow the use of MLCC as the primary filter capacitor(s).
POWER MODULATOR GAIN AND PHASE RESPONSE
WITH LOSSY BULK OUTPUT CAPACITORS
One such response is shown in Figure 5a. In this exam-
ple, the power modulator’s uncompensated crossover
is approximately 1/6 th the desired crossover frequency,
f CO . Note also, the uncompensated roll-off through the
0dB plane follows the double-pole, -40dB/dec slope
and approaches 180° of phase shift, indicative of a
potentially 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.
The desired (compensated) roll-off follows a -20dB/dec
slope (and commensurate 90° of phase shift), and, in
this example, occurs at approximately 6x the uncom-
pensated crossover frequency, f CO . In this example, a
Type II compensator provides for stable closed-loop
operation, leveraging the +20dB/dec slope of the
capacitor’s ESR zero (see Figure 5b).
POWER MODULATOR AND TYPE II COMPENSATOR
GAIN AND PHASE RESPONSE WITH LOSSY BULK
80
180
40
(ALUMINUM ELECTROLYTICS)
MAX15002 fig05a
f LC
90
OUTPUT CAPACITORS (ALUMINUM ELECTROLYTICS)
MAX15002 fig05b
20
45
60
< G E/A
135
0
|G MOD |
ASYMPTOTE
|G MOD |
0
40
20
|G E/A |
f LC
f CO
90
45
-20
< G MOD
f ESR
-45
0
0
-40
-90
-20
< G MOD
f ESR
-45
-40
-90
-60
-80
-135
-180
-60
-80
|G MOD |
-135
-180
10
100
1k
10k
100k
1M
10M
10
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
Figure 5a. Power Modulator Gain and Phase Response (Large,
Bulk COUT)
Maxim Integrated
FREQUENCY (Hz)
Figure 5b. Power Modulator (Large, Bulk COUT) and Type II
Compensator Responses
19
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相关代理商/技术参数 |
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|---|---|
| MAX15003ATM+ | 功能描述:DC/DC 开关控制器 Triple-Out Buck Ctlr w/Track/Sequence 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 |
| MAX15003ATM+T | 功能描述:DC/DC 开关控制器 Triple-Out Buck Ctlr w/Track/Sequence 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 |
| MAX15003EVKIT+ | 功能描述:电源管理IC开发工具 MAX15003 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 |
| MAX15004AAUE/V+ | 功能描述:电流型 PWM 控制器 Flyback/Boost/SEPIC Power-Supply Ctlr RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX15004AAUE/V+T | 功能描述:电流型 PWM 控制器 Flyback/Boost/SEPIC Power-Supply Ctlr RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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