- 您现在的位置：买卖IC网 > Datasheet目录310 > AOZ1083CI (Alpha & Omega Semiconductor Inc)IC LED DRVR BUCK CC 1.2A SOT23-6 Datasheet资料下载
参数资料
| 型号： | AOZ1083CI |
| 厂商： | Alpha & Omega Semiconductor Inc |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR BUCK CC 1.2A SOT23-6 |
| 标准包装： | 3,000 |
| 系列： | * |
AOZ1083
Detailed Description
I LED = -----------
The AOZ1083 is a high efficiency, simple to use, 1.2 A
buck HB LED driver optimized for general lighting
applications. Features include enable control, under
voltage lock-out, internal soft-start, output over-voltage
protection, over-current protection and thermal shut
down.
The AOZ1083 is available in a SOT23-6L package.
Soft Start and PWM Dimming
The AOZ1083 has an internal soft start feature to limit
in-rush current and ensure the output voltage ramps up
smoothly to regulation voltage. A soft start process
begins when the input voltage rises to a voltage higher
than UVLO and the voltage on the Dim pin is HIGH.
In the soft start process, the output voltage is typically
ramped to regulation voltage in 400 μ s. The 400 μ s soft
start time is set internally.
The DIM pin of the AOZ1083 is active high. Connect the
DIM pin to VIN if the enable function is not used. Pulling
DIM to ground will disable the AOZ1083. Do not leave it
open. The voltage on the DIM pin must be above 1.2 V to
enable the AOZ1083. When voltage on the DIM pin falls
below 0.4 V, the AOZ1083 is disabled.
Steady-State Operation
Under steady-state conditions, the converter operates in
fixed frequency and Continuous-Conduction Mode
(CCM).
The AOZ1083 integrates an internal NMOS as the
high-side switch. Inductor current is sensed by amplifying
the voltage drop across the drain to source of the high
side power MOSFET. Output voltage is divided down by
the external voltage divider at the FB pin. The difference
of the FB pin voltage and reference voltage is amplified
by the internal transconductance error amplifier. The
error voltage is compared against the current signal,
which is the sum of inductor current signal and ramp
compensation signal, at the PWM comparator input.
If the current signal is less than the error voltage, the
internal high-side switch is on. The inductor current flows
from the input through the inductor to the output. When
the current signal exceeds the error voltage, the
high-side switch is off. The inductor current is
freewheeling through the external Schottky diode to
output.
Switching Frequency
The AOZ1083 switching frequency is fixed and set by an
internal oscillator. The switching frequency is set
internally 1.5 MHz.
LED Current Programming
LED current can be set by feeding back the output to the
FB pin with the sense resistor R S shown in Figure 1.
The LED current can be programmed as:
0.28
R S
Protection Features
The AOZ1083 has multiple protection features to prevent
system circuit damage under abnormal conditions.
Over Current Protection (OCP)
The sensed inductor current signal is also used for over
current protection.
The cycle-by-cycle current limit threshold is set at 2 A.
When the load current reaches the current limit
threshold, the cycle-by-cycle current limit circuit
immediately turns off the high side switch to terminate the
current duty cycle. The inductor current stops rising. The
cycle-by-cycle current limit protection directly limits
inductor peak current. The average inductor current is
also limited due to the limitation on peak inductor current.
When cycle-by-cycle current limit circuit is triggered, the
output voltage drops as the duty cycle decreases.
The AOZ1083 has an internal short circuit protection to
protect itself from catastrophic failure under output short
circuit conditions. As a result, the converter is shut down
and hiccups. The converter will start up via a soft start
once the short circuit condition is resolved. In short circuit
protection mode, the inductor average current is greatly
reduced.
UVLO
An UVLO circuit monitors the input voltage. When the
input voltage exceeds 2.9 V, the converter starts
operation. When the input voltage falls below 2.3 V, the
converter will stop switching.
Thermal Protection
An internal temperature sensor monitors the junction
temperature. It shuts down the internal control circuit and
high side NMOS if the junction temperature exceeds
150o C. The regulator will restart automatically under the
control of the soft-start circuit when the junction
temperature decreases to 100 °C.
Rev. 1.0 July 2011
www.aosmd.com
Page 6 of 12
相关PDF资料 |
PDF描述 |
|---|---|
| AOZ1935QI | IC LED DRVR WHITE BCKLGT 16QFN |
| AOZ1977AI | IC LED DRVR BCKLGT 16SOIC |
| AP-104-NT | 12V PLUG TRANSFORMER EMPTY CASE |
| AP-120 | PLUG AUTO LOCKING BLACK |
| AP-121 | PLUG AUTO LOCKING BLACK W/LED |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AOZ1084DI | 制造商:Alpha & Omega Semiconductor 功能描述:IC LED DRVR BUCK CC 1.2A 8DFN |
| AOZ1092DI | 功能描述:IC REG BUCK ADJ 3A 8DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:EZBuck™ 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:升压（升压） 输出类型:两者兼有 输出数:1 输出电压:5V，2 V ~ 16.5 V 输入电压:2 V ~ 16.5 V PWM 型:- 频率 - 开关:45kHz 电流 - 输出:50mA 同步整流器:无 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 包装:管件 供应商设备封装:8-PDIP |
| AOZ1094AI | 功能描述:IC REG BUCK ADJ 5A SO-8 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:EZBuck™ 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:升压（升压） 输出类型:两者兼有 输出数:1 输出电压:5V，2 V ~ 16.5 V 输入电压:2 V ~ 16.5 V PWM 型:- 频率 - 开关:45kHz 电流 - 输出:50mA 同步整流器:无 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 包装:管件 供应商设备封装:8-PDIP |
| AOZ1094AIL | 制造商:Alpha & Omega Semiconductor 功能描述: |
| AOZ1094AIL_2 | 功能描述:IC REG BUCK 8SOIC 制造商:alpha & omega semiconductor inc. 系列:EZBuck?? 包装:带卷（TR） 零件状态:停產 功能:降压 输出配置:正 拓扑:降压 输出类型:可调式 输出数:1 电压 - 输入（最小值）:4.5V 电压 - 输入（最大值）:16V 电压 - 输出（最小值/固定）:0.8V 电压 - 输出（最大值）:16V 电流 - 输出:5A 频率 - 开关:500kHz 同步整流器:无 工作温度:-40°C ~ 85°C（TA） 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商器件封装:8-SO 标准包装:3,000 |
发布紧急采购，3分钟左右您将得到回复。