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参数资料
| 型号： | ADP1822ARQZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 19/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 24-QSOP |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 720kHz |
| 电源电压： | 3.7 V ~ 5.5 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： | 24-SSOP（0.154"，3.90mm 宽） |
| 包装： | 标准包装 |
| 产品目录页面： | 791 (CN2011-ZH PDF) |
| 配用： | ADP1822-EVAL-ND - BOARD EVALUATION FOR ADP1822 |
| 其它名称： | ADP1822ARQZ-R7DKR |
Data Sheet
or
ADP1822
where D SYNC is the duty cycle of the synchronization waveform.
= ? ln ? 1 ?
?
t SS
100 kΩ ( C SS )
?
?
0 . 6 V ? ?
0 . 8 V ? ?
= 1 . 386
(57)
Make sure that in all combinations of frequency, input, and
output voltages, the SYNC input fall time does not align with
the dc-to-dc converter fall time.
Solving for C SS and combining constants,
SETTING THE OUTPUT VOLTAGE TRACKING
C SS = (7.213 × 10 ?6 ) t SS
(58)
The ADP1822 provides a tracking function that limits the
D SYNC ≠ [ ( 320 ns ) ( f SW ) ] +
V OUT
SYNCHRONIZING THE CONVERTER
The dc-to-dc converter switching can be synchronized to an
external signal. This allows multiple ADP1822 converters to be
operated at the same frequency to prevent frequency beating or
other interactions.
To synchronize the ADP1822 switching to an external signal,
drive the SYNC input with the synchronizing signal. The ADP1822
can only synchronize up to 2× the nominal oscillator frequency.
If the frequency is set to 300 kHz (FREQ connected to GND), it
can synchronize up to 600 kHz. If the frequency is set to 600 kHz
(FREQ connected to VCC), it can synchronize to 1.2 MHz.
The high-side MOSFET turn-on follows the rising edge of
the SYNC input by approximately 320 ns. To prevent erratic
switching frequency, make sure that the falling edge of the
SYNC input signal does not coincide with the falling edge of
the dc-to-dc converter switching, or
(59)
V IN
output voltage to or below an external tracking voltage. This is
useful in systems where multiple dc-to-dc converters are used to
power different sections of a circuit, such as a microcontroller or a
DSP that has separate I/O and core voltages. In similar circuits,
if the nominally lower of the two voltages exceeds the nominally
higher voltage at startup or shutdown, the circuit powered may
experience problems. To prevent this, use the tracking feature of
the ADP1822 to limit the output voltage to or below the tracking
voltage at all times.
To use the tracking feature, connect TRKP to the output voltage
and drive TRKN with the tracking voltage. To ensure that noise
does not cause unstable operation, connect a 1 nF capacitor
between TRKN and TRKP as close to the ADP1822 as possible.
If either the ADP1822 output voltage or the tracking voltage at
any time exceeds the voltage at VCC, use equal voltage dividers
from the output voltage to TRKP and from the tracking voltage
to TRKN to prevent overstress on the TRKP and TRKN inputs.
Rev. D | Page 19 of 24
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP1822-BL1-EVZ | 制造商:Analog Devices 功能描述:Evaluation Board For PWM, Step-Down DC-To-DC Controller With Margining And Tracking 制造商:Analog Devices 功能描述:BLANK ADISIMPOWER EVAL ADP1822 - Boxed Product (Development Kits) |
| ADP1822-BL2-EVZ | 制造商:Analog Devices 功能描述:Evaluation Board For PWM, Step-Down DC-To-DC Controller With Margining And Tracking 制造商:Analog Devices 功能描述:BLANK ADISIMPOWER EVAL ADP1822 - Boxed Product (Development Kits) |
| ADP1822-EVAL | 功能描述:BOARD EVALUATION FOR ADP1822 RoHS:否 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ADP1823 | 制造商:AD 制造商全称:Analog Devices 功能描述:Dual, Interleaved, Step-Down DC-to-DC Controller with Tracking |
| ADP1823ACPZ | 制造商:Analog Devices 功能描述:IC CONTROLLER STEP DOWN DUAL SMD |
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