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MC34844
FUNCTIONAL DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
A0/SEN
Address select, device select pin, or Hardware Over-
voltage Protection (OVP) Control.
CURRENT SET (ISET)
Each LED string can drive up to 50 mA. The maximum
current can be set by using a resistor from this pin to GND.
POSITIVE CURRENT SCALING (PIN)
Positive current scaling factor for the external analog
current control. Applying 0 V to this pin, scales the current to
near 0%, and in the same way, applying 2.048 V (Vset), the
scale factor is 100%. By applying a voltage higher than 2.2 V,
the scaling factor is disabled, and the internal pull-ups are
activated.
If PIN pin and NIN pin are used at the same time then by
applying 0 V to the PIN pin and 2.048 V to NIN pin, scales the
current to near 0%, and in the same way, applying 2.048 V to
the PIN pin and 0 V to NIN pin, scales the current to 100%.
By applying a voltage higher than 2.2 V, the scaling factor is
disabled and the internal pull-ups are activated in both pins.
NEGATIVE CURRENT SCALING (NIN)
Negative current scaling factor for the external analog
current control. Setting 0 V to this pin scales the current to
100%, in the same way, setting 2.048 V (Vset) the scale
factor is near 0%. By applying a voltage higher than 2.2 V, the
scaling factor is disabled and the internal pull-ups are
activated.
If PIN pin and NIN pin are used at the same time then by
applying 0 V to the PIN pin and 2.048 V to NIN pin, scales the
current near 0%, and in the same way, applying 2.048 V to
the PIN pin and 0 V to NIN pin, scales the current to 100%.
By applying a voltage higher than 2.2 V, the scaling factor is
disabled and the internal pull-ups are activated in both pins.
GROUND (GND)
Ground Reference for all internal circuits other than the
Boost FET.
The Exposed Pad (EP) should be used for thermal heat
dissipation.
I0-I9
Current LED driver, each line has the capability of driving
up to 50 mA.
FAULT DETECTION PIN (FAIL)
When a fault situation is detected, this pin goes into high
impedance.
BOOST SLOPE COMPENSATION SETTING
RESISTOR (SLOPE)
Use an external resistor of about 68 k Ω to configure the
Boost compensation slope.
POWER GROUND PINS (PGNDA, PGNDB)
Ground pin for the internal Boost FET.
OUTPUT VOLTAGE SENSE PIN (VOUT)
Input pin to monitor the output voltage. It also supplies the
input voltage for the internal regulator 2 (VDC2).
SWITCHING NODE PINS (SWA, SWB)
Switching node of boost converter.
34844
Analog Integrated Circuit Device Data
15
Freescale Semiconductor
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MC34845 制造商:SPC Multicomp 功能描述:RECEPTACLE FREE 16WAY 制造商:SPC Multicomp 功能描述:RECEPTACLE, FREE, 16WAY
MC34845AEP 功能描述:LED照明驱动器 6-Ch LED Backlt Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
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MC34845BEP 功能描述:USB 接口集成电路 6-Ch LED Backlt Driver RoHS:否 制造商:Cypress Semiconductor 产品:USB 2.0 数据速率: 接口类型:SPI 工作电源电压:3.15 V to 3.45 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:WLCSP-20
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MC34845CEP 功能描述:LED照明驱动器 6-Ch LED Backlt Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
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