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参数资料
| 型号： | ADD5203ACPZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 12/24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
PWM DIMMING MODE
The ADD5203 supports an 8-bit resolution to control brightness;
therefore, the LED dimming duty is generated with 256 steps through
the PWM input duty value in the range of 0% to 100%. In addition,
if the PWM input duty cycle is 0% longer than 10 ms, the
ADD5203 is disabled.
Note that the ADD5203 has immunity when the PWM input
duty cycle is converted to 256 steps. Even the PWM input has
±0.195% jitter.
Direct PWM Dimming
Direct PWM mode is selected when SEL1 is low and SEL2 is low
for a PWM application. In this mode, the PWM input controls
the ADD5203 LED dimming logic. It turns the current sources on
and off without any duty extraction. In addition, each current
source has no phase delay in this mode. The LED brightness is
changed by the PWM input duty ratio.
DUTY = 60%
PWMI
Fixed Delay PWM Dimming
Fixed delay PWM mode is selected when SEL1 is open and SEL2 is
high for a PWM application, or when SEL1 is high and SEL2 is high
for an SMBus application. In this mode, each current source has a
fixed turn-on time delay between adjacent strings. The fixed delay
time is set by the FPWM frequency. Each channel delay time is set by
the following equation:
I LED 1
I LED 2
I LED 3
I LED 8
DUTY = 60%
t D =
2 × t FPWM
256
Figure 17. Direct PWM Dimming Timing
DC Current Dimming
where t FPWM = 1/f PWM , and f PWM is the LED dimming frequency.
DUTY = 60%
DC current mode is selected when SEL1 is low and SEL2 is open
for a PWM application, or when SEL1 is low and SEL2 is high for
PWMI
t FPWM
(DUTY = 60%)
an SMBus application. In this mode, the maximum LED current
is set by the value of R SET . Once the maximum LED current is set,
f PWM
t ON
t OFF
the LED current can be changed with 256 steps through PWM
input or SMBus.
I LED 1
DUTY = 80%
DUTY = 60%
DUTY = 40%
DUTY = 20%
t D
PWMI
I LED 2
I LED 8
7 × t D
I LED MAX
I LED
0.8 × I LED MAX
0.6 × I LED MAX
0.4 × I LED MAX
Figure 15. Fixed-Delay PWM Dimming Timing
0.2 × I LED MAX
No Delay PWM Dimming
No-delay PWM mode is selected when SEL1 is open and SEL2 is low
0A
Figure 18. DC Current Dimming Timing
for a PWM application or when SEL1 is high and SEL2 is low for an
SMBus application. In this mode, each current source turns on and
off at the same time without any phase delay.
DUTY = 60%
SAFETY FEATURES
The ADD5203 contains several safety features to provide stable
operation.
Soft Start
PWMI
DUTY = 60%
The ADD5203 contains an internal soft start function to reduce
f PWM
I LED 1
I LED 2
t ON
t OFF
inrush current at startup. The soft start time is typically 1.5 ms.
Overvoltage Protection (OVP)
The ADD5203 contains OVP circuits to prevent boost converter
damage if the output voltage becomes excessive for any reason. To
keep a safe output level, the integrated OVP circuit monitors the
I LED 8
Figure 16. No Delay PWM Dimming Timing
output voltage. When the OVP pin voltage is reached by the OVP
rising threshold, the boost converter stops switching, causing the
output voltage to drop. When the OVP pin voltage goes lower than
the OVP falling threshold, the boot converter begins switching,
causing the output to rise. There is about 7.5% hysteresis between
the rising and falling thresholds. The OVP level can be calculated
with the following equation:
Rev. 0 | Page 12 of 24
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