Datasheet > CAT32TDI-T3

CAT32TDI-T3

更新时间： 2024-01-21 09:21:00

品牌	Logo	应用领域
安森美 - ONSEMI		驱动器
页数	文件大小	规格书
11页	180K
描述
CMOS White LED Driver

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技术参数
数据手册

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CAT32TDI-T3 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	TSSOP
包装说明：	VSSOP, TSOP6,.11,37	针数：	6
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.24
接口集成电路类型：	LED DISPLAY DRIVER	JESD-30 代码：	R-PDSO-G6
JESD-609代码：	e3	长度：	2.9 mm
复用显示功能：	NO	功能数量：	1
区段数：	4	端子数量：	6
最高工作温度：	85 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	VSSOP
封装等效代码：	TSOP6,.11,37	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, VERY THIN PROFILE, SHRINK PITCH	峰值回流温度（摄氏度）：	NOT SPECIFIED
电源：	2/7 V	认证状态：	Not Qualified
座面最大高度：	1 mm	子类别：	Display Drivers
最大供电电压：	7 V	最小供电电压：	2 V
标称供电电压：	3 V	表面贴装：	YES
技术：	CMOS	温度等级：	INDUSTRIAL
端子面层：	Tin (Sn)	端子形式：	GULL WING
端子节距：	0.95 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	1.6 mm
最小 fmax：	1.6 MHz	Base Number Matches：	1

CAT32TDI-T3 数据手册

CAT32

In addition to providing the widest dimming range, PWM

Table 8. R_SETRESISTOR VALUES

brightness control also ensures the “purest” white LED color

over the entire dimming range. The true color of a white

LED changes with operating current, and is the “purest”

white at a specific forward current, usually 15 mA or

20 mA. If the LED current is less than or more than this

value, the emitted light becomes more blue. Applications

involving color LCDs can find the blue tint objectionable.

When a PWM control signal is used to drive the SHDN pin

of the CAT32, the LEDs are turned off and on at the PWM

frequency. The current through them alternates between full

current and zero current, so the average current changes with

duty cycle. This ensures that when the LEDs are on, they can

be driven at the appropriate current to give the purest white

light. LED brightness varies linearly with the PWM duty

cycle.

(mA)

SET

LED

562 W

750 W

909 W

1.13 kW

1.50 kW

2.26 kW

4.53 kW

For other LED current values, use the following equation

to choose R

SET

0.1 V

I_LED

_SET+ 255

Most white LEDs are driven at maximum currents of

15 mA to 20 mA. Some higher power designs will use two

parallel strings of LEDs for greater light output, resulting in

30 mA to 40 mA (two strings of 15 mA to 20 mA) flowing

into the LED pin.

LED Dimming with a Logic Signal

For applications that need to adjust the LED brightness in

discrete steps, a logic signal can be used. RMIN sets the

minimum LED current value (when the NMOS is OFF):

0.1 V

I_LED(MIN)

_MIN+ 255

LED Dimming with PWM Signal

PWM brightness control provides the widest dimming

range (greater than 20:1). By turning the LEDs ON and OFF

using the control signal the LEDs operate at either zero or

full current, but their average current changes with the PWM

signal duty cycle. Typically, a 5 kHz to 40 kHz PWM signal

is used. PWM dimming with the CAT32 can be

accomplished two different ways.

determines how much LED current increases when

INCR

the external NMOS switch is turned ON.

0.1 V

_INCR+ 255

I_{LED(Increase)}

LED Dimming with a DC Voltage

The SHDN pin can be driven directly or a resistor can be

added to drive the RSET pin. If the SHDN pin is used,

increasing the duty cycle will increase the LED brightness.

Using this method, the LEDs can be dimmed and turned off

completely using the same control signal. A 0% duty cycle

signal will turn off the CAT32, reducing the total quiescent

current to near zero.

If the RSET pin is used, increasing the duty cycle will

decrease the brightness. Using this method, the LEDs are

dimmed using RSET and turned off completely using

SHDN. If the RSET pin is used to provide PWM dimming,

_MAX* 0.1 V

_ADJ+ 225

_LED(MAX)* I_LEAD(MIN)

PCB Layout Guidelines

The CAT32 is a high−frequency switching regulator and

therefore proper PCB board layout and component

placement can minimize noise and radiation and increase

efficiency. To maximize efficiency, the CAT32 design has

fast switch rise and fall times. To prevent radiation and high

frequency resonance problems minimize the length and area

of all traces connected to the SW pin and use a ground plane

under the switching regulator.

The switch, schottky output diode and output capacitor

signal path should be kept as short as possible. The ground

resistor should be tied directly to the

GND pin and not be shared with other components.

the approximate value of R

should be calculated (where

PWM

MAX

is the “HIGH” value of the PWM signal):

V_MAX

0.15 V

ǒ Ǔ

_PWM+ R_SET

* 1

connection for the R

SET

CAT32

RSET

SHDN

RSET

PWM

ADJ

10 kW

PWM

Logic

Signal

INCR

SET

MIN

SET

0.1 mF

Figure 15. LED Dimming Circuits

http://onsemi.com

1...5 6 789 10 11

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