The article introduces a compact APD bias solution with adjustable current limit and adjustable VAPD, which can greatly reduce the size of the system and improve performance.
The document introduces the LT3571 as a complete APD bias solution in a 60mm² package with an on-the-fly adjustable current. It combines a current mode step-up DC/DC converter with a high-side fixed voltage drop APD current monitor and an integrated 75V power switch.
The device includes an integrated power switch rated for a maximum of 75V.
The integrated high side current monitor provides an accuracy of 8%.
The LT3571's APD current monitor achieves a transient response of less than 100ns.