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ML4423IP Datasheet(PDF) 5 Page - Micro Linear Corporation |
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ML4423IP Datasheet(HTML) 5 Page - Micro Linear Corporation |
5 / 10 page ML4423 5 FUNCTIONAL DESCRIPTION The ML4423 generates 2 reference sinewaves separated by 90º or 60º in a closed loop feedback system. These sinewaves can be varied in amplitude and frequency by the speed input. Signals across the motor windings are fed back and the ML4423 drives the external power output stage with the PWM sinewave signal necessary to cause the measured (feedback) output waveform to match the internal reference sinewaves. The ML4423 provides fixed period, variable duty cycle current limit protection, and a programmable dead time circuit to prevent cross conduction in the power output stage. An undervoltage lockout circuit turns off the external power transistors if VDD falls below 9V. CIRCUIT BLOCKS AND COMPONENT SELECTION RREF RREF should be set to 200kW. This current along with CPWM set the PWM frequency. Speed Control The voltage on VSPEED (pin 5) controls the sinewave frequency and amplitude. A 160k W resistor to ground on RSPEED (pin 6) converts the voltage on VSPEED to a current which is used to control the frequency of the output PWM sinewaves. The amplitude of the sinewaves increases linearly with VSPEED until it reahces 4.4V. Above this voltage the amplitude remains constant and only the frequency changes as shown in Figures 1 and 2. SINEA and SINEB Generators The capacitor to ground on C0 sets the frequency of the sinewave according to the following relationship. C0 should be a low temperature coefficient capacitor for stable output frequency. f V R CV SINE SPEED SPEED = × 4 0 170 0 . (1) For RSPEED = 160kW f V C SINE SPEED = × 108 800 0 , (2) With VSPEED = 3V and C0 = 0.47mF, fSINE = 58.7Hz and can be observed at test points SINEA (pin 10) and SINEB (pin 11). PWM Generator A triangular PWM frequency will be generated on a capacitor to ground on CPWM (pin 13). The frequency is set by the following equation: f C PWM PWM = × 1 200 000 , (3) For CPWM = 220pF, fPWM = 22.7kHz. It is recommended 150 120 90 60 30 02 4 6 8 VSPEED (V) RSPEED = 160 C0 = 0.47µF 1.25 1.00 0.75 0.50 0.25 0 24 4.4V 68 VSPEED (V) Figure 1. Frequency vs VSPEED Figure 2. Normalized Output Voltage vs VSPEED |
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