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| 型号： | ADP2114-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 21/40页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION 3.3V/1.8V |
| 设计资源： | Powering AD9268 with ADP2114 for Increased Efficiency (CN0137) |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 2，非隔离 |
| 输出电压： | 可调 |
| 电流 - 输出： | 4A，2A |
| 输入电压： | 2.75 ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 300kHz，600kHz，1.2MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ADP2114 |
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Data Sheet
THEORY OF OPERATION
ADIsimPower DESIGN TOOL
The ADP2114 is supported by ADIsimPower design tool set.
ADIsimPower is a collection of tools that produce complete
power designs optimized for a specific design goal. The tools
enable the user to generate a full schematic, bill of materials,
and calculate performance in minutes. ADIsimPower can
optimize designs for cost, area, efficiency, and parts count while
taking into consideration the operating conditions and
limitations of the IC and all real external components. For
more information about ADIsimPower design tools, refer to
www.analog.com/ADIsimPower. The tool set is available from
this website, and users can also request an unpopulated board
through the tool.
The ADP2114 is a high efficiency, dual, fixed switching frequency,
synchronous step-down, dc-to-dc converter with flex mode
architecture, which is the Analog Devices, Inc., proprietary
version of its peak current mode control architecture. The
device operates over an input voltage range of 2.75 V to 5.5 V.
Each output channel provides an adjustable output down to 0.6 V
and delivers up to 2 A of load current. When both the output
channels are tied together, they operate 180° out of phase to
deliver up to 4 A of load current. The integrated high-side,
P-channel power MOSFET and the low-side, N-channel power
MOSFET yield high efficiency at medium to heavy loads. Pulse
skip mode is available for improved efficiency at light loads. With
its high switching frequency (up to 2 MHz) and its integrated
power switches, the ADP2114 has been optimized to deliver
high performance in a small size for power management solutions.
The ADP2114 also includes undervoltage lockout (UVLO) with
hysteresis, soft start, and power good, as well as protection
features such as output short-circuit protection and thermal
shutdown. The output voltages, current limits, switching
frequency, pulse skip operation, and soft start time are
externally programmable with tiny resistors and capacitors.
CONTROL ARCHITECTURE
The ADP2114 consists of two step-down, dc-to-dc converters
that deliver regulated output voltages, V OUT1 and V OUT2 (see
high-side, P-channel power MOSFET and the low-side, N-channel
power MOSFET are switched on and off. In steady-state operation,
the output voltage, V OUT , is sensed on the feedback pin, FB1 (FB2),
and attenuated in proportion to the selected output voltage on
the V1SET (V2SET) pin.
An error amplifier integrates the error between the feedback
voltage and the reference voltage (V REF = 0.6 V) to generate an
error voltage at the COMP1 (COMP2) pin. The valley inductor
current is sensed by a current-sense amplifier when the low-side,
ADP2114
An internal oscillator turns off the low-side, N-channel
MOSFET and turns on the high-side, P-channel MOSFET at
a fixed switching frequency. When the high-side P-channel
MOSFET is enabled, the valley inductor current information is
added to an emulated ramp signal and compared to the error
voltage by the PWM comparator. The output of the PWM
comparator modulates the duty cycle by adjusting the trailing
edge of the PWM pulse that switches the power devices. Slope
compensation is programmed internally into the emulated ramp
signal and automatically selected, depending on the V IN , V OUT ,
and switching frequency. This prevents subharmonic oscil-
lations on the inductor current for greater than 50% duty-cycle
operation.
Control logic with the antishoot-through circuit monitor and
adjust the low-side and high-side driver outputs to ensure break-
before-make switching. This monitoring and control prevents
crossconduction between the internal high-side, P-channel
power MOSFET and the low-side, N-channel power MOSFET.
UNDERVOLTAGE LOCKOUT (UVLO)
The UVLO threshold is 2.65 V when VDD is increasing and
2.47 V when VDD is decreasing. The 180 mV hysteresis prevents
the converter from turning off and on repeatedly during a slow
voltage transition on VDD close to the 2.75 V minimum
operational level due to changing load conditions.
ENABLE/DISABLE CONTROL
The EN1 and EN2 pins are used to independently enable or
disable Channel 1 and Channel 2, respectively. Drive ENx high
to turn on the corresponding channel of ADP2114. Drive ENx
low to turn off the corresponding channel of ADP2114, reducing
input current below 1 μA. To force a channel to start automatically
when input power is applied, connect the corresponding ENx
to VDD. When shut down, the ADP2114 channels discharge
the soft start capacitor, causing a new soft start cycle every time
the converters are re-enabled.
SOFT START
The ADP2114 soft start feature allows the output voltage to ramp
up in a controlled manner, eliminating output voltage overshoot
during startup. Soft start begins after the undervoltage lockout
threshold is exceeded and the enable pin, EN1 (EN2), is pulled
high above 2.0 V. External capacitors to ground are required on
both the SS1 and SS2 pins. Each regulating channel has its own
soft start circuit. When the converter powers up and is enabled,
the internal 6 μA current source charges the external soft start
capacitor, establishing a voltage ramp slope at the SS1 (SS2) pin,
as shown in Figure 66. The soft start time period ends when the
soft start ramp voltage exceeds the internal reference of 0.6 V.
N-channel MOSFET is on.
Rev. B | Page 21 of 40
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP2114-EVALZ | 制造商:Analog Devices 功能描述:4A Step-Down DC/DC Converter Evaluation 制造商:Analog Devices 功能描述:ADP2114, DC TO DC CONVERTER, STEP DOWN, EVAL BOARD |
| ADP2116 | 制造商:AD 制造商全称:Analog Devices 功能描述:Configurable, Dual 3 A/Single 6 A, Synchronous, Step-Down DC-to-DC Regulator |
| ADP2116ACPZ-R7 | 功能描述:IC REG BUCK SYNC ADJ 32LFCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| ADP2116ACPZ-R7 | 制造商:Analog Devices 功能描述:DC/DC CONVERTER IC |
| ADP2116-BL1-EVZ | 功能描述:EVAL BOARD FOR ADP2116 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 标准包装:1 系列:- 主要目的:DC/DC，步降 输出及类型:1，非隔离 功率 - 输出:- 输出电压:3.3V 电流 - 输出:3A 输入电压:4.5 V ~ 28 V 稳压器拓扑结构:降压 频率 - 开关:250kHz 板类型:完全填充 已供物品:板 已用 IC / 零件:L7981 其它名称:497-12113STEVAL-ISA094V1-ND |
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