Datasheet > UC3578DPTRG4

UC3578DPTRG4

更新时间： 2024-01-01 10:51:54

品牌	Logo	应用领域
德州仪器 - TI		光电二极管
页数	文件大小	规格书
8页	145K
描述
IC,SMPS CONTROLLER,VOLTAGE-MODE,BIPOLAR,SOP,16PIN,PLASTIC

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技术参数
数据手册

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UC3578DPTRG4 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
包装说明：	SOP, SOP16,.25	Reach Compliance Code：	unknown
风险等级：	5.84	控制模式：	VOLTAGE-MODE
JESD-30 代码：	R-PDSO-G16	端子数量：	16
最高工作温度：	70 °C	最低工作温度：
最大输出电流：	0.2 A	封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装等效代码：	SOP16,.25
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
认证状态：	Not Qualified	子类别：	Switching Regulator or Controllers
表面贴装：	YES	最大切换频率：	120 kHz
技术：	BIPOLAR	温度等级：	COMMERCIAL
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	Base Number Matches：	1

UC3578DPTRG4 数据手册

UC2578

UC3578

APPLICATION INFORMATION (cont.)

(3) j-a of the package by improving the PCB mounting

method. It is recommended that the four GND pins (4, 5,

12 and 13) be connected to a ground plane to provide a

Pd = Qg • 100kHz +19mA • V ,

(

)

where Qg is the total MOSFET gate charge and 19mA is

the maximum quiescent current for the UC3578 (I

low resistance thermal path. If a ground plane is not

available, a heat spreader on a double sided PC board is

recommended.

) from the data sheet. The switching frequency of the

buck converter is 100kHz.

Note: Thermal impedance number is based on device

mounted to 5 square inch FR4 PC board with one ounce

copper. From Unitrode 95-96 data book Table 1, page

9-8, when resistance range is given, lower thermal im-

pedance values are for 5 square inch aluminum PC

board.

The gate charge can be determined from the MOSFET

data sheet. As an example, for a IRFZ34 which has a to-

tal gate charge of 46nC, substituting for Pd in equation 3:

(

)

0.95W = 46nC • 100kHz +19mA • V_IN, and

0.95W

)

= 40V.

(

IN max

0.0236A

ADDITIONAL INFORMATION

Therefore, at 70°C using a IRFZ34 MOSFET the maxi-

mum input voltage is limited to 40V to maintain a maxi-

mum junction temperature of 125°C in the 16 pin DP

package.

Please refer to the following Unitrode topic for additional

application information.

[1] Application Note U-167, Design and Evaluation of a

48V to 5V Telecom Buck Converter using the UC3578

Control IC by Mark Dennis.

Higher input voltages can be achieved by choosing a

MOSFET with a lower total gate charge or by a reduced

ambient operating temperature or by reducing the theta

-55°C

-25°C

25°C

125°C

85°C

VCC (V)

Figure 3. I vs. VCC vs. temperature.

UNITRODE CORPORATION

7 CONTINENTAL BLVD. • MERRIMACK, NH 03054

TEL. (603) 424-2410 FAX (603) 424-3460

1...3 4 567 8

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