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UC3824 PDF预览

UC3824

更新时间: 2024-11-17 22:39:59
品牌 Logo 应用领域
德州仪器 - TI 控制器
页数 文件大小 规格书
8页 387K
描述
High Speed PWM Controller

UC3824 数据手册

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UC1824  
UC2824  
UC3824  
High Speed PWM Controller  
FEATURES  
DESCRIPTION  
Complementary Outputs  
The UC1824 family of PWM control ICs is optimized for high fre-  
quency switched mode power supply applications. Particular care  
was given to minimizing propagation delays through the comparators  
and logic circuitry while maximizing bandwidth and slew rate of the  
error amplifier. This controller is designed for use in either current-  
mode or voltage mode systems with the capability for input voltage  
feed-forward.  
Practical Operation Switching Frequencies  
to 1MHz  
50ns Propagation Delay to Output  
High Current Dual Totem Pole Outputs  
(1.5A Peak)  
Protection circuitry includes a current limit comparator with a 1V  
threshold, a TTL compatible shutdown port, and a soft start pin which  
will double as a maximum duty cycle clamp. The logic is fully latched  
to provide jitter free operation and prohibit multiple pulses at an out-  
put. An under-voltage lockout section with 800mV of hysteresis as-  
sures low start up current. During under-voltage lockout, the outputs  
are high impedance.  
Wide Bandwidth Error Amplifier  
Fully Latched Logic with Double Pulse  
Suppression  
Pulse-by-Pulse Current Limiting  
Soft Start / Max. Duty Cycle Control  
Under-Voltage Lockout with Hysteresis  
Low Start Up Current (1.1 mA)  
These devices feature totem pole outputs designed to source and  
sink high peak currents from capacitive loads, such as the gate of a  
power MOSFET. The on state is designed as a high level.  
±
Trimmed Bandgap Reference (5.1V 1%)  
BLOCK DIAGRAM  
UDG-92034-1  
3/97  

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