UCC38C41D

Frequency - Switching:	--
Base Part Number:	UCC38C41
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Operating Temperature:	0°C ~ 70°C (TA)
Control Features:	Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	49%
Series:	--
Voltage - Supply (Vcc/Vdd):	6.6 V ~ 18 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck, Boost, Flyback, Forward Converter
Output Configuration:	Positive
Function:	Step-Up, Step-Down, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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UCC38C41D Application Field and Working Principle
The UCC38C41D is a high performance pulse width modulation (PWM) current-mode controller engineered to drive a power MOSFET or IGBT in constant frequency current-mode switching power supply applications. It offers the low power efficiency, low cost and optimal transient characteristics that eliminate the need for external loop compensation, providing an ideal replacement for multiple dedicated analog components. This device is designed to drive a power MOSFET or IGBT in a synchronous buck and forward converter for high frequency power supplies.

A DC-DC switching controller is an integrated circuit used to regulate, monitor and manage the power of an electrical device operating on DC power supplies. It essentially converts the desired voltage from one level to the desired target level, allowing the power of an electrical device to be increased or decreased. There are several types of DC-DC switching controllers, with each possessing different characteristics.
UCC38C41D Features
The UCC38C41D is especially functional in many applications due to several features it includes:

• Constant frequency current mode operation
• Internal driver for gate drive transistor
• Cyclically adaptive pulse-by-pulse current limit
• Internal soft-start
• Thermal shut-down protection
• Logic high-enable
• Programmable oscillator frequency

Integrated Components
The UCC38C41D is constructed with several functional integrated components. It contains a Fast start-up power FET, a driver and an oscillator circuit. This integrated package further simplifies the power supply design due to its single-chip integration.
Working Principle
The UCC38C41D operates in the Constant Frequency Current Mode (CFCM) control scheme which is the most economical control scheme among the PWM control schemes. In this scheme, the current mode control algorithm takes into account all the adaptive functions such as soft-start, current limit, and cycle-by-cycle leading edge blanking (LEB). The voltage-mode control algorithm is used to regulate the output voltage and maintain the accuracy of the output voltage. The CFCM operations of the UCC38C41D takes into account the voltage at the control node that corresponds to the top MOSFET and the lower MOSFET.
The pulse-width modulation (PWM) control scheme used by the UCC38C41D is a pure current-mode control scheme. This scheme operates using the premise that an output current is constant and directly proportional to the difference between the inputs. In current-mode control, a small current is injected into the error amplifier to control the voltage ratio. The reference voltage determines the average current delivered from the error amplifier, and this is then used to control the top and the lower MOSFETs.
The UCC38C41D applies pulse-width modulation to ensure best operation for the load. To maintain the output voltage, the controller builds in a gain of 1/X, where X is the fixed frequency in kHz. The gain is used to adjust the amount of voltage feedback and the PWM duty cycle. As the output voltage changes, the voltage difference between the lower MOSFET and the top MOSFET will change, and the duty cycle will be adjusted accordingly. The UCC38C41D can also be set to a fixed-frequency setting, which is common for applications below 200kHz. If higher frequencies are needed, the user can set the UCC38C41D for switched frequency operation.
Applications
Due to its high performance, UCC38C41D is used in a wide range of applications, such as:

• Desktop computer power supplies
• Auxiliary power supplies
• Notebook computer power supplies
• Cellular phone power supplies
• High efficiency lighting systems
• Small motor drives

The UCC38C41D is easily integrated into many applications due to its small size, low power consumption, and its ability to provide accurate voltage regulation. It is suitable for power supplies utilizing non-isolated dc-dc converters for medium to high current applications. It provides low noise operation with many integrated voltage protection circuits, to increase system reliability and safety.

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