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OPA2210: 峰值检测电路

Part Number: OPA2210

采用如图的峰值检测电路采样IGBT驱动电阻的峰值开通电压(G1+为信号输出端,G1为地),发现问题:

无论用电阻还是BJT组成泄放回路,运放输出的峰值电压与实际相差较大(实际峰值开通电压约为8V,运放输出仅为4V左右)。

不知道哪位大佬可以解答。