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参数资料
| 型号： | MAX17480EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 26/48页 |
| 文件大小： | 0K |
| 描述： | EVALUATION KIT FOR MAX17480 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 3，非隔离 |
| 输入电压： | 4 ~ 26 V |
| 稳压器拓扑结构： | 降压 |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX17480 |
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AMD 2-/3-Output Mobile Serial
VID Controller
? I L R SENSE G m ( FBAC ) R FBDC + ? I L R ESR
≤ 33 mV
( 66 mV ? ? I L R ESR ) ( R FBAC + R F B )
R FBDC ≤
V OUT ( MAX ) ( V IN ( MAX ) ? V OUT ( MAX ) )
Transient Phase Repeat
When a transient occurs, the output voltage deviation
depends on the controller’s ability to quickly detect the
transient and slew the inductor current. A fixed-frequency
controller typically responds only when a clock edge
occurs, resulting in a delayed transient response. To
minimize this delay time, the MAX17480 includes
enhanced transient detection and transient phase
repeat capabilities. If the controller detects that the out-
put voltage has dropped by 41mV, the transient detec-
tion comparator immediately retriggers the phase that
completed its on-time last. The controller triggers the
subsequent phases as normal, on the appropriate
oscillator edges. This effectively triggers a phase a full
cycle early, increasing the total inductor-current slew
rate and providing an immediate transient response.
Core SMPS Feedback
Adjustment Amplifiers
The MAX17480 provides an FBAC and FBDC pin for
each SMPS to allow for flexible AC and DC droop set-
tings. FBAC is the output of an internal transconduc-
tance amplifier that outputs a current proportional to the
current-sense signal. FBDC is the feedback input that is
compared against the internal target. Place resistors
and capacitors at the FBAC and FBDC pins as shown
in Figure 5. With this configuration, the DC droop is
always less than or equal to the AC droop.
MAX17480
I FBAC = G m ( FBAC ) V CS
where V CS = V CSP - V CSN is the differential current-sense
voltage, and G m(FBAC) is typically 2mS as defined in the
Electrical Characteristics table. DC droop is typically used
together with the +12.5mV offset feature to keep within the
DC tolerance window of the application. See the Offset
and Address Change for Core SMPSs (OPTION) section.
The ripple voltage on FBDC must be less than the -33mV
(max) transient phase repeat threshold:
R FBAC
R FBAC + R FBDC + R FB
2
R FBAC ? I L R SENSE G m ( FBAC ) ? 66 mV
where ? I L is the inductor ripple current, R ESR is the
effective output ESR at the remote sense point, R SENSE
is the current-sense element, and G m(FBAC) is 2.06mS
(max) as defined in the Electrical Characteristics table.
The worst-case inductor ripple occurs at the maximum
input-voltage and maximum output-voltage conditions:
? I L ( MAX ) =
V IN ( M A X ) f SW L
To make the DC and AC load-lines the same, directly
short FBAC to FBDC.
To disable DC voltage positioning, remove R FB , which
connects FBAC to FBDC.
Core Transient Voltage-Positioning Amplifier
CSP
G m(FBAC)
FBAC
R FBAC
(AC Droop)
Each of the MAX17480 core supply SMPSs includes one
CSN
ERROR
AMP
FBDC
C FB
R FB
R FBDC
100 ?
CORE SENSE_H
transconductance amplifier for voltage positioning. The
amplifiers’ inputs are generated by summing their respec-
tive current-sense inputs, which differentially sense the
4700pF
voltage across either current-sense resistor or the induc-
TARGET
AGND
tor’s DCR.
The voltage-positioning droop amplifier’s output (FBAC)
Figure 5. Core SMPS Feedback Connection
Core Steady-State Voltage Positioning (DC Droop)
connects to the remote-sense point of the output
through an RC network that sets each phase’s AC volt-
age-positioning gain:
FBDC is the feedback input to the error amplifier.
Based on the configuration in Figure 5, the core SMPS
output voltage is given by:
V OUT = V TARGET ?
R FBAC × R FBDC
R FBAC + R FBDC + R FB Z CF B
I FBDC
V OUT = V TARGET ?
R FBDC × R FBAC
R FBAC + R FBDC + R FB
× I FB A C
where the target voltage (V TARGET ) is defined in the
Nominal Output-Voltage Selection section, Z CFB is the
where the target voltage (V TARGET ) is defined in the
Nominal Output-Voltage Selection section, and the
FBAC amplifier’s output current (I FBAC ) is determined
by each phase’s current-sense voltage:
effective impedance of C FB , and the FBAC amplifier’s
output current (I FBAC ) is determined by each phase’s
current-sense voltage:
26
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17480EVKIT+ | 功能描述:电源管理IC开发工具 MAX17480 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 |
| MAX17480GTL+ | 功能描述:显示驱动器和控制器 2-/3-Output Mobile erial VID Ctlr RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX17480GTL+T | 功能描述:显示驱动器和控制器 2-/3-Output Mobile erial VID Ctlr RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX17482GTL+ | 功能描述:电压模式 PWM 控制器 NDA IC RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX17482GTL+T | 功能描述:电压模式 PWM 控制器 NDA IC RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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