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HEAT oven to 350°F.
BEAT reduced-fat cream cheese and 1/2 cup sugar in large bowl with mixer until blended. Add egg whites and zest; mix well. Combine 1 cup flour and baking soda. Add to cream cheese mixture alternately with sour cream, beating well after each addition. (Do not overmix.) Spread onto bottom and 1 inch up side of 9-inch springform pan sprayed with cooking spray.
TOSS 2 cups berries with remaining sugar and flour; spoon over cream cheese mixture to within 1/2 inch of edge.
BAKE 40 to 45 min. or until toothpick inserted in center comes out clean. Run knife around rim of pan to loosen cake; cool before removing rim. Spoon remaining berries over cake. Serve topped with COOL WHIP.