March 4 (Reuters) - CSR Ltd CSR.AX :
* Says will commence an on-market share buy-back of its ordinary shares of up to $150 million
* Says share buy-back represents a return of surplus cash expected to be generated by the company
* Says buy-back period is expected to begin on 21 March 2016 and will continue over the financial years ending 31 March 2017 and 2018
* Timing of buy-back and number of shares to be purchased will depend on share price levels, cash flow generation and capital requirements
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