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参数资料
| 型号： | ADD5203ACPZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/24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
V OVP =
1 . 2 V
R1
× ( R1 + R2 )
Thermal Overload Protection
Thermal overload protection prevents excessive power dissipation
In general, the suitable OVP level is 5 V higher than the nominal
boost switching regulator output. Large resistors, up to 1 MΩ, can
be used for R2 to minimize power loss. In addition, some applications
require C1 to prevent noise interference at the OVP pin in the
range of 10 pF to 30 pF.
V OVP
R2
from overheating the ADD5203. When the junction temperature
(T J ) exceeds 160°C, a thermal sensor immediately activates the
fault protection, which shuts down the device, allowing the IC to
cool. The device self-starts when the junction temperature (T J ) of
the die falls below 130°C.
SMBUS INTERFACE
SMBus mode can be selected using the SEL1 and SEL2 mode
OVP
DETECTION
OVP
COMP
22
R1
C1
selection pins. When in SMBus mode, the ADD5203 can be
controlled with an SMBus serial interface.
Read Byte
OVP
REF
Figure 19. Overvoltage Protection Circuit
Open Load Protection (OLP)
The ADD5203 contains a headroom control circuit to minimize
power loss at each current source. Therefore, the minimum
feedback voltage is achieved by regulating the output voltage of
the boost converter. If any LED string is opened during normal
operation, the current source headroom voltage (V HR ) is pulled to
GND. In this condition, open load protection (OLP) is activated if
V HR is less than 200 mV until the boost converter output voltage
rises up to the OVP level.
Short-Circuit Protection (SCP)
The ADD5203 contains the short circuit protection (SCP). If a
few LEDs at any strings are shorted during normal operation, the
current source headroom voltage (V HR ) is increasing. In this
condition, SCP is activated if V HR is higher than 7.2 V; therefore,
the string that includes short LEDs is disabled.
Undervoltage Lockout (UVLO)
As shown in Figure 21, the read byte protocol is four bytes long and
starts with the slave address followed by the command code, which
translates to the register index. Then, the bus direction turns around
with the rebroadcast of the slave address, with Bit 0 indicating a read
cycle. The fourth byte contains the data being returned by the
backlight controller. The byte value in the data byte should reflect the
value of the register being queried at the command code index. Note
the bus directions, which are shaded in Figure 21 and are used on
cycles where the slaved backlight controller drives the data line. All
other cycles are driven by the host master.
Write Byte
The write byte protocol is only three bytes long. The first byte
starts with the slave address followed by the command code,
which translates to the register index being written. The third
byte contains the data byte that must be written into the register
selected by the command code. Note the bus directions, which
are shaded in Figure 22 and are used on cycles where the slaved
backlight controller drives the data line. All other cycles are driven
by the host master.
An undervoltage lockout circuit is included with built-in hysteresis.
The ADD5203 turns on when VIN rises above 5 V (typical) and
shuts down when VIN falls below 4.6 V (typical).
Rev. 0 | Page 13 of 24
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