Shown below is the internal block diagram of a switched mode battery charger IC (LT1510). The LT1510 is a current mode, PWM (pulse-width modulated), positive buck switcher that operates in one of two states: constant current or constant voltage.
Iam having difficulty understanding the operation and internal block diagram of IC (especially the highlighted sections). Kindly excuse my beginner level knowledge on current mode control and op-amp compensation.
- Can somebody explain how 'constant voltage- constant current' mode happens here?
- The current mode control employed is peak current mode control. In peak current mode control inductor current is sensed ( along with slope compensation) and compared with a control voltage derived from the voltage control loop. What is the purpose of current amplifiers CA1 and CA2 here?