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UC3548QTR PDF预览

UC3548QTR

更新时间： 2024-11-11 20:28:43
品牌 Logo 应用领域
德州仪器 - TI 开关
页数 文件大小 规格书
10页 362K
描述
2.2A SWITCHING CONTROLLER, 1000kHz SWITCHING FREQ-MAX, PQCC20, PLASTIC, LCC-20

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UC3548QTR 技术参数

是否Rohs认证： 不符合生命周期：Obsolete
零件包装代码：QLCC包装说明：PLASTIC, LCC-20
针数：20Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.91Is Samacsys：N
模拟集成电路 - 其他类型：SWITCHING CONTROLLER控制模式：CURRENT-MODE
控制技术：PULSE WIDTH MODULATION最大输入电压：20 V
最小输入电压：11 V标称输入电压：12 V
JESD-30 代码：S-PQCC-J20长度：8.965 mm
功能数量：1端子数量：20
最高工作温度：70 °C最低工作温度：
最大输出电流：2.2 A封装主体材料：PLASTIC/EPOXY
封装代码：QCCJ封装等效代码：LDCC20,.4SQ
封装形状：SQUARE封装形式：CHIP CARRIER
峰值回流温度（摄氏度）：NOT SPECIFIED认证状态：Not Qualified
座面最大高度：4.57 mm子类别：Switching Regulator or Controllers
表面贴装：YES切换器配置：SINGLE
最大切换频率：1000 kHz技术：BIPOLAR
温度等级：COMMERCIAL端子形式：J BEND
端子节距：1.27 mm端子位置：QUAD
处于峰值回流温度下的最长时间：NOT SPECIFIED宽度：8.965 mm
Base Number Matches：1

UC3548QTR 数据手册

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UC1548  
UC2548  
UC3548  
Primary Side PWM Controller  
FEATURES  
BLOCK DIAGRAM  
•
Primary Side Voltage Feed-  
forward Control of Isolated Power  
Supplies  
•
Accurate DC Control of  
Secondary Side Short Circuit  
Current using Primary Side  
Average Current Mode Control  
•
•
Accurate Programmable  
Maximum Duty Cycle Clamp  
Maximum Volt-Second Product  
Clamp to Prevent Core Saturation  
•
•
Practical Operation Up to 1MHz  
High Current (2A Pk) Totem Pole  
Output Driver  
•
•
Wide Bandwidth (8MHz) Current  
Error Amplifier  
Undervoltage Lockout Monitors  
VCC, VIN and VREF  
•
•
Output Active Low During UVLO  
Low Startup Current (500µA)  
UDG-95037  
Pin numbers refer to 16-pin DIL and SOIC packages only.  
DESCRIPTION  
The UC3548 family of PWM control ICs uses voltage feed- driver. The current error amplifier easily interfaces with an  
forward control to regulate the output voltage of isolated optoisolator from a secondary side voltage sensing circuit.  
power supplies. The UC3548 resides on the primary side  
A full featured undervoltage lockout (UVLO) circuit is con-  
and has the necessary features to accurately control sec-  
tained in the UC3548. UVLO monitors the supply voltage  
ondary side short circuit current with average current  
to the controller (VCC), the reference voltage (VREF), and  
mode control techniques. The UC3548 can be used to  
the input line voltage (VIN). All three must be good before  
control a wide variety of converter topologies.  
soft start commences. If either VCC or VIN is low, the sup-  
In addition to the basic functions required for pulse width  
modulation, the UC3548 implements a patented technique  
of sensing secondary current from the primary side in an  
isolated buck derived converter. A current waveform syn-  
thesizer monitors switch current and simulates the inductor  
current downslope so that the complete current waveform  
can be constructed on the primary side without actual sec-  
ondary side measurement. This information on the primary  
side is used by an average current mode control circuit to  
accurately limit maximum output current.  
ply current required by the chip is only 500µA and the  
output is actively held low.  
Two on board protection features set controlled limits to  
prevent transformer core saturation. Input voltage is moni-  
tored and pulse width is constrained to limit the maximum  
volt-second product applied to the transformer. A unique  
patented technique limits maximum duty cycle within 3%  
of a user programmed value.  
These two features allow for more optimal use of trans-  
formers and switches, resulting in reduced system size  
and cost.  
The UC3548 circuitry includes a precision reference, a  
wide bandwidth error amplifier for average current control,  
an oscillator to generate the system clock, latching PWM  
comparator and logic circuits, and a high current output  
Both patents embodied in the UC3548 belong to Lambda  
Electronics Incorporated and are licensed for use in appli-  
cations employing these devices.  
4/97  
1234567...10

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