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L5986ATR Datasheet(PDF) 11 Page - STMicroelectronics |
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L5986ATR Datasheet(HTML) 11 Page - STMicroelectronics |
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11 / 39 page  L5986 - L5986A Functional description 11/39 5.3 Error amplifier and compensation The error amplifier (E/A) provides the error signal to be compared with the sawtooth to perform the pulse width modulation. Its non-inverting input is internally connected to a 0.6 V voltage reference, while its inverting input (FB) and output (COMP) are externally available for feedback and frequency compensation. In this device the error amplifier is a voltage mode operational amplifier so with high DC gain and low output impedance. The uncompensated error amplifier characteristics are the following: In continuous conduction mode (CCM), the transfer function of the power section has two poles due to the LC filter and one zero due to the ESR of the output capacitor. Different kinds of compensation networks can be used depending on the ESR value of the output capacitor. In case the zero introduced by the output capacitor helps to compensate the double pole of the LC filter a type II compensation network can be used. Otherwise, a type III compensation network has to be used (see Chapter 6.4 for details about the compensation network selection). Anyway the methodology to compensate the loop is to introduce zeros to obtain a safe phase margin. Table 5. Uncompensated error amplifier characteristics Parameter Value Low frequency gain 100 dB GBWP 4.5 MHz Slew rate 7 V/ μs Output voltage swing 0 to 3.3 V Maximum source/sink current 25 mA/40 mA |
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