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The value of the collateral locked in the CDP needs to maintain a certain percentage of the stablecoin minted, usually around a 150% collateralized ratio (i.e. over-collateralized). For example, if you deposited $150 worth of ETH for collateral, you can mint 100 USC.
This over-collateralization is important to prevent the CDP from being under-backed during periods of volatility, which may cause the stablecoin to be depegged.