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| 型号： | ADP1864-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION ADP1864 |
| 产品培训模块： | Power Line Monitoring |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 3.3V |
| 电流 - 输出： | 3A |
| 输入电压： | 9 ~ 12V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 580kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ADP1864 |
| 产品目录页面： | 791 (CN2011-ZH PDF) |
| 相关产品： | ADP1864AUJZ-R7DKR-ND - IC REG CTRLR BUCK PWM TSOT23-6 ADP1864AUJZ-R7CT-ND - IC REG CTRLR BUCK PWM TSOT23-6 ADP1864AUJZ-R7TR-ND - IC REG CTRLR BUCK PWM TSOT23-6 |
ADP1864
THEORY OF OPERATION
The ADP1864 is a constant frequency (580 kHz), current-mode
buck controller. PGATE drives the gate of the external P-channel
FET. The duty cycle of the external FET dictates the output
voltage and the current supplied to the load.
The peak inductor current is measured across the external sense
resistor, while the system output voltage is fed back through an
external resistor divider to the FB pin.
At the start of every oscillator cycle, PGATE turns on the
external FET, causing the inductor current, and therefore the
current sense amplifier voltage, to increase. The inductor
current increases until the current amplifier voltage equals
the voltage at the COMP pin. This resets the internal flip-flop,
causing PGATE to go high and turning off the external FET.
The inductor current decreases until the beginning of the next
oscillator period.
The voltage at the COMP node is the output of the internal
error amplifier. The negative input of the error amplifier is the
output voltage scaled by an external resistive divider, and the
V IN = 3.15V TO 14V
Data Sheet
positive input to the error amplifier is driven by a 0.8 V band
gap reference. An increase in the load current causes a small
drop in the feedback voltage, in turn causing an increase in the
COMP voltage and, therefore, the duty cycle. The resulting
increase in the on time of the FET provides the additional
current required by the load.
LOOP STARTUP
Pulling the COMP pin to GND disables the ADP1864. When
the COMP pin is released from GND, an internal 0.6 μA current
source charges the external compensation capacitor on the
COMP node. Once the COMP voltage has charged to 0.67 V,
the internal control blocks are enabled and COMP is pulled up
to its minimum normal operating voltage (0.9 V). As the voltage at
COMP continues to increase, the on time of the external FET
increases to supply the required inductor current. The loop
stabilizes completely once the COMP voltage is sufficiently high
to support the load current. The regulation voltage at FB is 0.8 V.
IN
5
4
CS
VREF
UVLO
VREF
0.8V
OSC
15mV
SLOPE
COMP
ICMP
RSI
R
Q
S
UVLO,
SWITCHING
LOGIC AND
BLANKING
CIRCUIT
V IN
6
G
PGATE
S
D
2.5V
2A
GND
2
V IN
FREQUENCY
FOLDBACK
SHORT-CIRCUIT
DETECT
0.35V
OVP
VREF
+
80mV
EAMP
VREF
0.6μA
0.8V
3
FB
V IN
0.3V
COMP
1
0.3V SHDN
CMP
SHDN
UV
UVLO
0.8V
ADP1864
Figure 12. Functional Block Diagram
Rev. C | Page 8 of 16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP1870 | 制造商:AD 制造商全称:Analog Devices 功能描述:Synchronous Buck Controller with Constant On-Time and Valley Current Mode |
| ADP1870-0.3-EVALZ | 功能描述:BOARD EVAL FOR ADP1870-0.3 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 |
| ADP1870-0.6-EVALZ | 功能描述:BOARD EVAL FOR ADP1870-0.6 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 |
| ADP1870-1.0-EVALZ | 功能描述:BOARD EVAL FOR ADP1870-1.0 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 |
| ADP1870ACPZ-0.3-R7 | 功能描述:IC REG CTRLR BUCK PWM CM 10LFCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
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