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| 型号： | ADP2114-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 22/40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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ADP2114
Data Sheet
The power good circuitry monitors the output voltage on the
1
2
4
3
ENx
V OUT
SSx
SW
FB1 (FB2) pin and compares it to the rising and falling
thresholds shown in Table 1. If the output voltage, V OUT 1
(V OUT 2), exceeds the typical rising limit of 116% of the target
output voltage, V OUT 1 SET (V OUT 2 SET ), the PGOOD1 (PGOOD2)
pin pulls low. The PGOOD1 (PGOOD2) pin continues to pull
low until the output voltage recovers down to 108% (typical) of
the target value.
If the output voltage drops below 84% of the target output voltage,
the corresponding PGOOD1 (PGOOD2) pin pulls low. The
PGOOD1 (PGOOD2) pin continues to pull low until the output
CH1 5.0V
CH3 5.0V
CH2 1.0V
CH4 2.0V
M1.0ms
A CH1
2.4V
voltage rises to within 92% of the target output voltage. The
PGOOD1 (PGOOD2) pin then releases and signals the return
V REF I
Figure 66. Soft Start
The capacitance value of the soft start capacitor defines the soft
start time, t SS , based on
= SS (1)
t SS C SS
of the output voltage within the power good window.
The power good thresholds are shown in Figure 68. The PGOOD1
and PGOOD2 outputs also sink current if an overtemperature
condition is detected. Use these outputs as logical power good
signals by connecting the pull-up resistors from PGOOD1
(PGOOD2) to VDD. If the power good function is not used, the
where:
V REF is the internal reference voltage, 0.6 V.
I SS is the soft start current, 6 μA.
C SS is the soft start capacitor value.
If the output voltage V OUT1 (V OUT2 ) is precharged prior to enabling
Channel 1 (Channel 2), the control logic prevents inductor
current reversal by holding the power MOSFETs off until the
soft start voltage ramp at SS1 (SS2) reaches the precharged
pins can be left floating.
V OUT RISING
116%
100%
92%
V OUT FALLING
108%
100%
84%
UNDERVOLTAGE
POWER
OVERVOLTAGE
POWER
UNDERVOLTAGE
GOOD
GOOD
1
ENx
PGOOD1
(PGOOD2)
2
4
V OUT
SSx
Figure 68. PGOOD1 and PGOOD2 Thresholds
PULSE SKIP MODE
The ADP2114 has built-in, pulse skip circuitry that turns on
during light loads, switching only as necessary to maintain the
output voltage within regulation. This allows the converter to
3
SW
maintain high efficiency during light load operation by reducing
the switching losses. The pulse skip mode can be selected by
configuring the OPCFG pin according to Table 7. In pulse skip
CH1 5.0V CH2 1.0V M200μs A CH1
CH3 5.0V CH4 500mV
Figure 67. Start with a Precharged Load
POWER GOOD
2.4V
mode, when the output voltage dips below regulation, the
ADP2114 enters PWM mode for a few oscillator cycles to
increase the output voltage back to regulation. During the
wait time between bursts, both power switches are off, and the
The ADP2114 features open-drain, power-good outputs
(PGOOD1 and PGOOD2) that indicate when the converter
output voltage is within regulation. The power good signal
transitions low immediately when the corresponding channel is
disabled.
output capacitor supplies all load current. Because the output
voltage dips and recovers occasionally, the output voltage ripple
in this mode is larger than the ripple in the PWM mode of
operation.
If the converter is configured to operate in forced PWM mode
(by selecting that configuration on the OPCFG pin), the device
operates with a fixed switching frequency, even at light loads.
Rev. B | Page 22 of 40
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相关代理商/技术参数 |
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|---|---|
| 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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