- 您现在的位置：买卖IC网 > Datasheet目录307 > ADD5203ACPZ-RL (Analog Devices Inc)IC LED DRVR WHITE BCKLGT 28LFCSP Datasheet资料下载
参数资料
| 型号： | ADD5203ACPZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/24页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 28LFCSP |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 8 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 350kHz ~ 1MHz |
| 电源电压： | 6 V ~ 21 V |
| 输出电压： | 45V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 28-LFCSP-WQ（4x4） |
| 包装： | 标准包装 |
| 工作温度： | -25°C ~ 85°C |
| 其它名称： | ADD5203ACPZ-RLDKR |
ADD5203
THEORY OF OPERATION
CURRENT-MODE, STEP-UP SWITCHING REGULATOR
Table 8. R FPWM and C FPWM Recommendation
OPERATION
The ADD5203 uses a current-mode PWM boost regulator to
provide the minimal voltage needed to enable the LED string at
the programmed LED current. The current-mode regulation
system allows fast transient response while maintaining a stable
output voltage. By selecting the proper resistor-capacitor network
Dimming Freq (f PWM )
200 Hz
500 Hz
1 kHz
5 kHz
10 kHz
R FPWM (kΩ)
110
75
50
18
13
C FPWM (pF)
390
200
150
47
20
from COMP to GND, the regulator response can be optimized for
a wide range of input voltages, output voltages, and load conditions.
The ADD5203 can provide a 45 V maximum output voltage and
drive up to 13 LEDs (3.4 V/30 mA type of LEDs) for each channel.
INTERNAL 3.3 V REGULATOR
The ADD5203 contains a 3.3 V linear regulator. The regulator is
used for biasing internal circuitry. The internal regulator requires
a 1 μF bypass capacitor. Place this bypass capacitor between
VDDIO (Pin 4) and GND, as close as possible to Pin VDDIO.
BOOST CONVERTER SWITCHING FREQUENCY
The ADD5203 boost converter switching frequency is user
adjustable, between 350 kHz to 1 MHz, by using an external
resistor, R F . A frequency of 350 kHz is recommended to optimize
the regulator for high efficiency, and a frequency of 1 MHz is
recommended for small external components.
See Figure 14 for considerations when selecting a switching
frequency and an adjustment resistor (R F ).
1100
1000
900
800
CURRENT SOURCE
The ADD5203 contains eight current sources to provide accurate
current sinking for each LED string. String-to-string tolerance is
kept within ±1.5% at 20 mA. Each LED string current is adjusted
up to 30 mA by an external resistor.
The ADD5203 contains an LED open and short fault protection
circuit for each channel. If the headroom voltage of the current
source remains below 200 mV while the boost converter output
reaches the OVP level, the ADD5203 recognizes that the current
source has an open load fault for the current source, and the current
source is disabled. If the headroom voltage of the current source
goes above 7.2 V, the current source is disabled for short protection.
If an application requires four LED strings, each LED string
should be connected using FB1 to FB4. Tie the unused FB pins
(FB5 to FB8) to GND.
The ADD5203 contains hysteresis to prevent the LED current
change that is caused by a ±0.195% jitter of the PWM input.
Programming the LED Current
As shown in Figure 2, the ADD5203 has an LED current set pin
(I SET ). A resistor (R SET ) from this pin to ground adjusts the LED
current up to 30 mA. LED current level can be set with the
following equation:
700
600
I LED =
2831
R SET
( A )
500
400
DIMMING CONTROL INTERFACE
The ADD5203 dimming control interface method is selectable
between the SMBus serial input and/or the external PWM input.
300
120
170
220
270
320
R F (k ? )
370
420
470
The LED dimming modes supported by ADD5203 can be
controlled externally through these dimming control interfaces.
Figure 14. Switching Frequency vs. R F
DIMMING FREQUENCY (f PWM )
The SEL1 and SEL2 pins should be set based on the application
conditions (see Table 9).
The ADD5203 contains an internal oscillator to generate the
PWM dimming signal for LED brightness control. The LED
dimming frequency (f PWM ) is adjustable, in the f PWM range of 200 Hz
to 10 kHz, by using an external resistor (R FPWM ) and capacitor
Table 9. Brightness Control Mode Selection
SEL1 SEL2 Dimming Mode
High High Fixed delay PWM
Low No delay PWM
Interface
SMBus
SMBus
(C FPWM ). The R FPWM should be in the range of 13 kΩ to 110 kΩ,
Open
High
Fixed delay PWM
PWM
and the C FPWM should be in the range of 20 pF to 390 pF.
Low
Low
High
Open
Low
No delay PWM
DC current
DC current
Direct PWM
PWM
SMBus
PWM
PWM
Rev. 0 | Page 11 of 24
相关PDF资料 |
PDF描述 |
|---|---|
| ADD5205ACPZ-RL | IC LED DVR WHITE BCKLGT 12LFCSP |
| ADE5566ASTZF62-RL | IC ENERGY METERING 1PHASE 64LQFP |
| ADE7156ASTZF16 | IC ENERGY METER 64-LQFP |
| ADE7156ASTZF8-RL | IC ENERGY METER 64-LQFP |
| ADE7518ASTZF8-RL | IC ENERGY METER MCU 8K 64LQFP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADD5205 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Four-String White LED Driver |
| ADD5205ACPZ-RL | 功能描述:IC LED DVR WHITE BCKLGT 12LFCSP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:60 系列:- 恒定电流:- 恒定电压:- 拓扑:线性（LDO），PWM，升压（升压） 输出数:8 内部驱动器:是 类型 - 主要:背光 类型 - 次要:RGB，白色 LED 频率:500kHz ~ 1.5MHz 电源电压:4.75 V ~ 26 V 输出电压:45V 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* 工作温度:-40°C ~ 85°C |
| ADD5207 | 制造商:AD 制造商全称:Analog Devices 功能描述:Four-String, White LED Driver |
| ADD52070001CPZR | 功能描述:IC LED DRIVER REGULATOR DIM 制造商:analog devices inc. 系列:* 零件状态:上次购买时间 标准包装:1 |
| ADD5207ACPZ | 制造商:Analog Devices 功能描述:DRIVER LED 1MHZ 36V 14LFCSP 制造商:Analog Devices 功能描述:DRIVER, LED, 1MHZ, 36V, 14LFCSP 制造商:Analog Devices 功能描述:DRIVER, LED, 1MHZ, 36V, 14LFCSP, Topology:Boost (Step Up), No. of Outputs:1, Out 制造商:Analog Devices 功能描述:DRIVER, LED, 1MHZ, 36V, 14LFCSP, Topology:Boost (Step Up), No. of Outputs:1, Output Voltage:36V, Driver Case Style:LFCSP, Input Voltage Min:6V, Input Voltage Max:21V, Dimming Control Type:PWM, Switching Frequency:1MHz, Operating , RoHS Compliant: Yes |
发布紧急采购，3分钟左右您将得到回复。