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MIC2199 Datasheet(PDF) 7 Page - Micrel Semiconductor |
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MIC2199 Datasheet(HTML) 7 Page - Micrel Semiconductor |
7 / 15 page November 2004 7 MIC2199 MIC2199 Micrel A ramp is added to the amplified current-sense signal to provide slope compensation, which is required to prevent unstable operation at duty cycles greater than 50%. A transconductance amplifier is used for the error amplifier, which compares an attenuated sample of the output voltage with a reference voltage. The output of the error amplifier is the COMP (compensation) pin, which is compared to the current-sense waveform in the PWM block. When the current signal becomes greater than the error signal, the comparator turns off the high-side drive. The COMP pin (pin 1) provides access to the output of the error amplifier and allows the use of external components to stabilize the voltage loop. Current Sense Amp Error Amp VIN VDD CORRECTIVE RAMP PWM COMPARATOR RESET Oscillator 7 10 6 12 11 8 9 4 5 3 1 COMP 100k MIC2199 FB R2 R1 VOUT CSH VDD BST CIN VIN HSD Q2 Q1 D1 D2 CBST COUT VIN VOUT L1 VSW LSD PGND CCOMP RCOMP 4.7µF S R Q CONTROL LOGIC AND PULSE-WIDTH MODULATOR RCS Gm = 0.2×10 -3 AV = 2 V 0.8V R1 R2 OUT =+ 1 Reference ⎞ ⎠ ⎛ ⎝ Figure 2. PWM Operation VDD 0V 0V 0V 0V 0A VDD VIN + VDD VIN VSW Reset Pulse VHSD VLSD ILOAD IL1 Figure 3. PWM-Mode Timing |
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