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ML4435IP Datasheet(PDF) 10 Page - Micro Linear Corporation |
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ML4435IP Datasheet(HTML) 10 Page - Micro Linear Corporation |
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10 / 14 page  PRELIMINARY DATASHEET May, 2000 10 PRELIMINARY ML4435 COAST When CVCO (pin 20) is pulled below 1.5V the output drivers LA, LB, LC and HA, HB, and HC are turned off. The COAST function shuts all power off from the motor allowing it to coast to a stop. The COAST function in (pin 20) is configured as shown in Figure 13 and can be driven by a switch to ground or open collector to ground also shown in Figure 13. Figure 14a. ML4435 Typical Application UNDER VOLTAGE PROTECTION Undervoltage protection is used to protect the 3 phase bridge power stage from a low VCC condition. Undervolt- age is triggered at VCC of 9.2V or under. Undervoltage also turns off all output drivers LA, LB, LC, HA, HB, and HC. The comparator that triggers undervoltage protection has 500mV of hystersis. INTERFACING THE OUTPUT DRIVERS TO THE 3 PHASE BRIDGE POWER STAGE The most flexible configuration is to use high side drivers to control N-Channel MOSFETs (or IGBTs) allowing appli- cations from less than 12V up to 170V. Figure 14a shows the ML4435 and all the support circuitry in a typical application. Figure 14b shows a power stage using the IR2118 high side drivers from International Rectifier and high voltage MOSFETs. FUNCTIONAL DESCRIPTION 2 3 4 5 6 9 0 2 3 4 5 6 9 0 2 3 4 5 6 9 20 2 22 23 24 25 26 20 9 6 5 4 3 2 C2 2V 0. F C 4F C5 0.33 F C4 0F C .033 F C .F R5 0k R6 TP 2 S FB 200k C9 .0 F C0 TP 5 LIMIT RUN N.C. SW SW4PDT COAST N.C. N.C. IDC 26 P N.C. N.C. N.C. 2V N.C. N.C. N.C. 00 F R 0 k R 2 k R9 k R k R 90.9k R k TP SPEED SET TP 3 TACH TP 0 ISENSE R2 00k R6 0k R4 20k C3 2200 F R3 k ML4435 ISENSE TACH S COMP RVCO S SET RT HA HB HC VCC CVCO I LIMIT S FB ND FB C FB B FB A LC LB LA .5V 3. 5V 2V + – COMP CVCO COAST 20 Figure 13. Coast Control |
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