Multifunctional Input Voltage Pin Reduces Power Converter IC Pins
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Solution Overview
Problem
The power converter industry faces challenges in reducing the number of pins in power converter controller ICs without compromising efficiency or increasing manufacturing costs, as each pin is typically associated with a single function, making it difficult to minimize pins without sacrificing performance.
Innovation Solution
A power converter controller IC that utilizes an input voltage pin with multiple functions, including charging an external capacitor and programming a programmable resistor, to reduce the number of pins required, thereby lowering manufacturing costs while maintaining performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each pin is associated with a single function in conventional power converter controller ICs, then the IC can reliably perform all required functions, but the number of pins increases leading to higher manufacturing costs
Solution Approach 1:
The VIN pin is designed to perform multiple functions: it serves as the input voltage pin for the power converter, charges the external startup capacitor through internal charging circuitry, and receives test signals for programming the programmable resistor in the input voltage scale down circuitry. This multi-functional design reduces the total pin count without compromising the reliability of any individual function.
2Ease of manufacture
If the number of pins in the power converter controller IC is reduced, then manufacturing costs decrease, but the number of parameters that can be input or output is limited
Solution Approach 1:
The VIN pin accepts different types of signals for different purposes: normal operating voltage for power conversion, test signals for programming the programmable resistor, and signals for charging the startup capacitor. This allows the IC to maintain adaptability for multiple parameters while using fewer pins.
Solution Approach 2:
The functionality of the VIN pin is dynamically switched based on operational mode. During startup, it charges the external capacitor; during normal operation, it provides input voltage; during testing, it receives programming signals. This dynamic multi-functionality enables the IC to handle various parameters at different times without requiring dedicated pins for each function.
3Device complexity
If the VIN pin is used for multiple functions including charging external capacitor and programming resistor, then the number of pins is reduced, but the pin must handle complex signal processing
Solution Approach 1:
The complex signal processing at the VIN pin is segmented into separate functional circuits within the IC: charging circuitry for capacitor charging, scale down circuitry with programmable resistor for voltage scaling, and test signal processing circuitry for programming. Each circuit handles a specific aspect of the multi-functional requirements, making the overall system more manageable despite the pin's multiple roles.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The use of a multifunctional input voltage pin allows for a reduction in the number of pins, leading to lower manufacturing costs without sacrificing the performance of the power converter, as it integrates charging and scaling functions within a smaller pin configuration.
Implementation Method 1
charging circuitry coupled internally to the input voltage pin of the controller IC for charging a capacitor coupled externally to a supply voltage pin of the controller IC
Implementation Method 2
scale down circuitry for scaling down the input voltage received at the input voltage pin to a voltage level compatible with the device characteristics of the controller IC
Data Source
AI summary
A controller integrated circuit (IC) for controlling a power converter uses its input voltage pin with a plurality of functions, including receiving an input voltage to the power converter, charging an external startup capacitor through charging circuitry coupled internally to the input voltage pin, and also receiving a test signal for programming a programmable resistance in an input voltage scale down circuitry coupled to the input voltage pin. Use of the input voltage pin with a plurality of functions reduces the number of pins required in the controller IC, thereby reducing the cost of manufacturing the controller IC.