Datasheet > WhiteLED> RT9301

RT9301

更新时间： 2024-02-27 13:00:49

品牌	Logo	应用领域
立锜 - RICHTEK		驱动器白色LED灯
页数	文件大小	规格书
9页	251K
描述
3-Channel Low Dropout RGB LED Driver

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技术参数
数据手册

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RT9301 技术参数

Status：	Active	Vin (min) (V)：	2.8
Vin (max) (V)：	5.5	SW Freq (typ) (kHz)：
Number of LEDs (max) (pcs)：	3	Iout (max)/channel (mA)：	20
Iq (typ) (mA)：	0.5	Dimming Control：	PWM
Topology：		Features：	Enable Input
Package Type：	TSOT-28;WDFN3x3-8

RT9301 数据手册

RT9301

Applications Information

The LED current of each channel can be controlled from

2mA to 50mA. It is easy to obtain a multi-color output

by changing the current of ISET1, ISET2, and ISET3

respectively.

The RT9301 is a 3-Channel current source driver for RGB

LED or white LEDs. The output current can be controlled

from 2mA to 50mA by adjusting the setting current from

external. It is easy to support a multi-color RGB LED.

Input UVLO

R_SET= 51k

R_SET= 36k

R_SET= 75k

The input operating voltage range of the RT9301 is 2.8V to

5.5V. An input capacitor at the VINpin could reduce ripple

voltage. It is recommended to use a ceramic 1uF or larger

capacitance as the input capacitor. This IC provides an

under voltage lockout (UVLO) function to prevent it from

unstable issue when startup. The UVLO threshold of input

falling voltage is set at 2.1V typically with a hysteresis

0.1V.

R_SET= 160k

R_SET= 360k

Output Current Setting

1.5

2.5

3.5

4.5

5.5

The LED current is setting by the current of ISET pin. The

LED current of the three channels (LED1, LED2, LED3)

could be set from the ISET (ISET1, ISET2, ISET3) pins

individually. The typical application circuit shows as

Figure 1.

V_SET(V)

Figure 2. LED Current Setting

Figure 2 shows the characteristics of I_LEDvs. V_SET. If the

R_SETis selected, the LED current could be controlled from

V_SET. The voltage of VSET must be higher than 1.3V to

enable the LED. For low LED current application, it is

recommended to use a higher resistance on RSET (for

example: R_SET= 360kΩ).

BAT

1uF

VIN LED1 LED2 LED3

SET1

ISET1

ISET2

ISET3

To disable the LED current, the ISET pin should be

connected to ground or floating. For one LED or two LEDs

application, the unused ISET pin should be connected to

GND. In addition, don’ t short V_SETxto ISETx pin.

SET1

SET2

SET3

SET2

RT9301

SET3

GND

Figure 1. Typical Application Circuit

BAT

1uF

The LEDcurrent can be controlled from an external voltage

(V_SET) and a resistor (R_SET) between VSET and ISET pin.

The voltage range of V_SETis from 1.3V to 5.5V. The internal

reference voltage at ISET pin is 0.9V typically. LEDcurrent

is set as 800 times the current flowing into ISET pin.

Therefore, the LED current can be calculated as the

following equation.

VIN LED1 LED2 LED3

SET1

ISET1

ISET2

ISET3

SET1

SET2

RT9301

SET2

GND

V^{SET1 ~ 3}- 0.9V

I^{LED1 ~ 3}= 800 x I^{SET1 ~ 3}= 800 x

RSET1 ~ 3

Figure 3. Application Circuit for Two LEDs

For example, R_SET1= 45kΩ and V_SET1= 1.8V, the current

of LED1 is equal to 16mA.

www.richtek.com

DS9301-02 March 2007

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