APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739

2

EVALUATION KIT

FOR SA01 PIN-OUT

EK01

TYPICAL COMPONENT FUNCTIONS

R1

Provides -IN bias from the Reference voltage.

R2

Sets DC scaling for external feedback such as tachometers, position sensors or current sensors.

R3

With R4 sets DC operating point of +IN, with R13 and R15 sets gain of voltage feedback circuit.

R4

With R3 sets DC operating point of +IN.

R5

Input scaling of the control signal.

R6

With C6 sets the corner frequency of the integrator.

R7

With C3 & C4 forms a low pass filter for the external feedback loop. Often used with tachometers.

R8

With C2 forms a low pass filter for the current limit circuit.

R9

Current sense. Often is a piece of resistance wire.

R10

With R8 divides shutdown signal voltage feeding SHDN/FILTER pin.

R11

With C5 sets corner frequency for external feedback loop.

R12, 13, 15, 16

Provides voltage feedback for a voltage controlled output.

R14

Helps set gain or scale input voltage levels.

R17

With C12 provides low pass filtering of +IN signal.

C1

Power supply bypass.

C2

With R8 form a low pass filter for the current limit circuit, also filters the SHDN signal.

C3, 4

With R7 forms a low pass filter for the external feed back loop. Often used with tachometers.

C5

With R11 sets corner frequency for external feedback loop.

C6

With R6 sets the corner frequency of the integrator.

C7

Power supply bypass, must have very low ESR in MHz range.

C8

Filters reference or feedback voltage at +IN.

C9

Bypass for the reference voltage.

C10, 11

With R15 and R16 provides low pass filtering of voltage feedback.

C12

With R17 provides low pass filtering of +IN signal.

C13

Provides AC coupling of +IN signal.

D1 – D4

Optional flyback diodes.

D5 – D7

Input protection zener diodes.

FIGURE 2. PCB SCHEMATIC.

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