MCP1012 1W Demonstration Board User’s Guide
DS50002932A-page 28
2020 Microchip Technology Inc.
8. Check on the oscilloscope screen the signals V_PULSE, V_GATE and V_C/S as
they are presented in
FIGURE 6-1:
V_PULSE, V_GATE and V_CS when COMP1 Reference Is Not
Reached.
When a valid PWM signal in the 20–65 kHz frequency range is applied the MCP1012’s
gate driver is driven by the signal at the PULSE pin and not by the internal signal. The
COMP1 Reference threshold during external command switches from 125 mV to
252 mV typical.
9. Disconnect the DC power supplies.
10. Disconnect the load at J4.
6.2
SETUP 4B
INTRODUCTION
This setup will show the functioning of the MCP1012 in Normal Run mode when an
external command is applied at PULSE pin and the C/S pin voltage reaches the
COMP1 Reference (252 mV).
STEPS
1. Connect/disconnect the jumpers and the switch SW1 according to
2. Connect at the jumper J4 an external load consisting of a 10
, min 3W resistor.
3. Connect at the jumper J6 the output of the signal generator with the next setup:
square waveform, minimum voltage 0V, maximum v5.0V, frequency
20 kHz, duty cycle 30%.
4. Connect three oscilloscope probes at TP4 (PULSE input), TP6 (GATE output),
and TP8 (C/S input). Connect the ground probes on the primary side, at the TP14
or TP15 Test Points.
5. Connect a DC power supply 15V at the TB2 connector:
TABLE 6-2:
THE STATE OF THE JUMPERS AND SWITCH - SETUP 4B
J1
J2
J3
J4
J5
J6
J7
JP1
SW1.1
SW1.2
SW1.3
SW1.4
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
