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  • 深圳市巨辉通科技有限公司

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  • 数量2015 
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产品型号YB1508的概述

芯片YB1508的概述 YB1508芯片是一款集成电路,广泛应用于多种电子设备中,其主要功能涉及数据处理和控制。该芯片在设计上注重高性能和低功耗,适用于便携式设备和工业自动化等领域。从1990年代初期问世以来,YB1508逐渐被各大电子制造商所接受,凭借其出色的兼容性和稳定性,在市场上占据一定的份额。 芯片YB1508的详细参数 YB1508的技术参数涵盖了多个方面,包括工作电压、工作频率、功耗、存储器容量等。具体参数如下: - 工作电压:3.3V - 5V - 工作频率:最大可达100MHz - 功耗:静态功耗约为10μA,动态功耗在50mW左右 - 存储器:内置256KB闪存及128KB SRAM - 输入/输出引脚:32个可编程I/O引脚,支持多种接口协议,包括UART、SPI、I2C等 - 温度范围:-40℃至+85℃,适应恶劣环境 - 封装形式:TQFP-32封装,尺寸为7m...

产品型号YB1508的Datasheet PDF文件预览

YB1508  
Step-up DC-DC Converter , White LED Driver  
Description  
Features  
The YB1508 is a step-up DC-DC converter,  
acting as current source to drive up to 8  
white LEDs in series. Series connecting of  
the LEDs provides identical LED currents  
resulting in uniform brightness and  
eliminating the need for ballast resistors.  
The light intensity of these LEDs is  
proportional to the current passing through  
them. Additional features include output over  
voltage protection to prevent device damage  
due to faulty LED or open circuit caused by  
abnormal conditions, and one-pin shutdown  
and multiple methods of dimming control.  
„ 2.7V to 9V input range  
„ Adjustable output voltage up to 40V  
„ Built in internal switch  
„ Inherently matched LED current  
„ Fixed frequency of 1MHz PWM  
operation  
„ Open LED protection  
„ Low profile 5-Lead SOT-23 package  
„ High efficiency: over 80% at 3.6V  
input voltage  
„ Drives up to 8 white LEDs  
Applications  
The YB1508 switches at a fixed frequency of  
1MHz, allowing the use of tiny external  
components and low input noise and ripple.  
To control LED brightness, the LED current  
can be pulsed by applying a PWM (pulse  
width modulated) signal with a frequency  
range of 100Hz to 50KHz to the CTRL pin.  
The YB1508 is available in a low profile 5-lead  
SOT-23 package.  
„ LCD Display Module  
„ OLED panel/sub-panel  
„ White LED Backlighting  
„ Digital Camera  
„ Cellular Phone  
„ Portable Application  
Typical Application Circuit  
Figure 1Typical Application Circuit  
YB1508 MRev1.4  
WWW.YOBON.COM.TW  
1
YB1508  
Step-up DC-DC Converter , White LED Driver  
Pin Description  
Figure 2YB1508 SOT23-5  
Pin Designator  
Table 1 :  
Pin  
Name  
Description  
Switching Pin. This is the collector of the internal NPN power switch. Connect to  
inductor and diode. Minimize the metal trace area connected to this pin to reduce  
EMI.  
1
SW  
Ground Pin. Connect directly to local ground plane.  
2
3
GND  
FB  
Feedback Pin. Reference voltage is 200mV. Connect LEDs and a resistor at this  
pin. LED current is determined by the resistance and CTRL voltage.  
Shutdown Pin and Dimming Control pin.  
A. VCTRL > 1.8V generates full-scale LED current  
B. VCTRL < 0.4V chip is off  
4
5
CTRL  
VIN  
C. Switching from 0.4V to 2.0V, PWM duty cycle controls the LED current  
Input Supply Pin. Bypass this pin with a capacitor as close to the device as  
possible.  
Ordering Information  
Table 2:  
Order Number  
Package Type  
Supplied as  
Package Marking  
Y58  
High Ovp YB1508  
Low Ovp YB1508P  
SOT23-5  
SOT23-5  
3000 units Tape & Reel  
3000 units Tape & Reel  
Y58P  
YB1508 MRev1.4  
WWW.YOBON.COM.TW  
2
YB1508  
Step-up DC-DC Converter , White LED Driver  
Absolute Maximum Ratings  
SW voltage  
All other pins  
40V  
10V  
Maximum Junction Temp,Tj  
Lead Temperature (Soldering 10  
sec)  
150 °C  
300 °C  
195 °C  
Thermal Resistance  
Electricity Characteristics  
Table 3(TA=25°C, Vin=3.3V Cin=1uF Cout=4.7uF unless otherwise noted)  
Function Parameter  
Conditions  
Min  
Typ  
Max  
Units  
Input Voltage Range  
2.7  
9
V
Iout =20mA, Vout = 12.5V  
Circuit of figure 1. (L=22uH  
Cout =4.7uF)  
Feedback Voltage  
180  
2
200  
220  
20  
mV  
Rfb = 10 ohms  
FB Pin Bias current  
Supply current  
10  
3.5  
1
μA  
mA  
μA  
Vfb = 0.3V  
CTRL = 0V  
Switching Frequency  
Maximum Duty Cycle  
Minimum duty cycle  
Switch Vcesat  
0.7  
20  
0.8  
1.3  
93  
35  
MHz  
%
25  
200  
250  
1
%
At Isw = 200mA  
40% duty cycle  
Ctrl = 0.3V  
mV  
mA  
μA  
V
Switch Current Limit  
Switch Leakage Current  
VCTRL for Full LED current  
CTRL Pin Bias Current  
Chip turn off delay  
1.6  
1.7  
20  
1.8  
30  
Ctrl = 2V  
μA  
μS  
YB1508  
36  
21  
Over Voltage Protection  
V
YB1508P  
YB1508 MRev1.4  
WWW.YOBON.COM.TW  
3
YB1508  
Step-up DC-DC Converter , White LED Driver  
Functional Block Diagram  
Figure 3. Block Diagram  
small size and high efficiency are major  
Application Information  
Operation  
concerns, the inductor should have low  
core losses at 1MHz and low DCR  
(copper wire resistance).  
The operation of YB1508 can be  
understood by referring to the block  
Capacitor Selection  
diagram in Figure 3.  
A voltage  
The small size of ceramic capacitors  
m a k e s t h e m i d e a l f o r Y B 1 5 0 8  
applications. X5R and X7R types are  
recommended because they retain their  
capacitance over wider voltage and  
temperature ranges than other types.  
proportional to the switch current is added  
to a ramp output and the resulting sum is  
fed into the positive terminal of the PWM  
comparator. When this voltage exceeds  
the level of the comparator negative input,  
the peak current has been reached, and  
the SR latch is reset and turns off the  
power switch. The voltage at the negative  
input of the comparator comes from the  
output of the error amplifier. The error  
amplifier sets the correct peak current  
level to keep the output in regulation. If  
the error amplifier’s output increases,  
more current is delivered to the output; if it  
decreases, less current is delivered.  
Diode selection  
To maintain high efficiency, the average  
current rating of the schottky diode  
should be larger than the peak inductor  
current, IPK. Schottky diode with a low  
forward drop and fast switching speeds  
are ideal for increasing efficiency in  
portable applications. The reverse  
breakdown voltage of the schottky diode  
must be larger than the output voltage.  
Inductor Selection  
A 22uH inductor is recommended for most  
YB1508 applications. Although  
YB1508 MRev1.4  
WWW.YOBON.COM.TW  
4
YB1508  
Step-up DC-DC Converter , White LED Driver  
Inrush Current  
The maximum switch current is limited to protection circuit. When the LEDs are  
about 300 mA by the chip. Typically, this disconnected from the circuit or fail  
large current will occur for about 40us open, the YB1508 will then shutdown  
during start up. A larger Cout will increase until Vin goes low or CTRL goes lower  
the duration of high current. However, than 0.4V. Different maximum Vout  
when Vin is first connected, an even can be requested from YoBon.  
larger current can flow into Cout. This  
occurs when the SW pin is open circuit  
Board Layout Consideration  
and and the Cout voltage changes from  
To maximize efficiency, rise and fall  
0V to Vin in a few microseconds. Because  
times of switch should be made as  
the duration of this large current is short, it  
short as possible. Proper layout of the  
will usually not cause problems.  
high frequency switching path is  
important to prevent electromagnetic  
LED Current and Dimming Control  
interference (EMI) problems. Place  
The LED current can be reduced by pulse COUT close to the VOUT pin. A  
width modulating the CTRL voltage from ground plane under the switching  
0.4V to 1.8V. Using the PWM mode, the regulator is needed to minimize  
LED current can be controlled from 0% to interplane coupling. In addition, the  
100%.  
feedback resistor Rs should be tied  
directly to the GND Pin without any  
other connection to ensure a clean,  
noise-free connection.  
Open Circuit Protection  
The YB1508 has an internal open-circuit  
Figure 4. Dimming Control Using a DC Voltage  
Figure 5. Dimming Control Using a Filtered PWM  
Signal  
YB1508 MRev1.4  
WWW.YOBON.COM.TW  
5
YB1508  
Step-up DC-DC Converter , White LED Driver  
Figure 6. Li-Ion to Two White LEDs Application Circuit  
Figure 7. Li-Ion to Three White LEDs Application Circuit  
Figure 8. Four White LEDs Application Circuit  
YB1508 MRev1.4  
WWW.YOBON.COM.TW  
6
YB1508  
Step-up DC-DC Converter , White LED Driver  
SOT-25 Package Information  
All the contents in this datasheet are not assuming any responsibility for use of  
any circuitry described, no circuit patent license are implied and Yobon reserves  
the right at any time without notice to change said circuitry and specifications.  
YB1508 MRev1.4  
WWW.YOBON.COM.TW  
7
配单直通车
YB1517ST25产品参数
型号:YB1517ST25
生命周期:Contact Manufacturer
IHS 制造商:YOBON TECHNOLOGIES INC
包装说明:SOT-23, 5 PIN
Reach Compliance Code:unknown
风险等级:5.76
Is Samacsys:N
其他特性:ADJUSTABLE OUTPUT VOLTAGE UP TO 20V
模拟集成电路 - 其他类型:SWITCHING REGULATOR
控制模式:CURRENT-MODE
控制技术:PULSE WIDTH MODULATION
最大输入电压:16 V
最小输入电压:2.7 V
标称输入电压:3.3 V
JESD-30 代码:R-PDSO-G5
长度:2.92 mm
功能数量:1
端子数量:5
最高工作温度:85 °C
最低工作温度:-40 °C
最大输出电流:1 A
封装主体材料:PLASTIC/EPOXY
封装代码:LSSOP
封装形状:RECTANGULAR
封装形式:SMALL OUTLINE, LOW PROFILE, SHRINK PITCH
座面最大高度:1.45 mm
表面贴装:YES
切换器配置:BOOST
最大切换频率:950 kHz
温度等级:INDUSTRIAL
端子形式:GULL WING
端子节距:0.95 mm
端子位置:DUAL
宽度:1.6 mm
Base Number Matches:1
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