Obsolete

Product(s)

- Obsolete

Product(s)

AN1645 - APPLICATION NOTE

17/22

Figure 20: Demo board Schematic

Table 3: Board Components

PWRGND

FR DRAIN

FW DRAIN

+5V

+5V

Vin

+5V

OFF

R7

R6

C4

R2

U2

STSR2

4

5

2

6

3

Ck

INHIBIT

Vcc

SGLGND

SETANT

R1

C1

JP4

R3

R8

JP3

FR

Q4

FW

Q2

FW

Q3

FR

Q1

C6

D1

D3

JP5

JP6

CON1

CON2

CON3

FW

Q6

JP1

C3

CON5

C2

D4

78L05

3

1

VI

Vo

FR

Q5

D6

Q7

NPN smd

R12

COMP R4

COMP R5

COMP R11

COMP C7

COMP R9

COMP C8

COMP D5

COMP R10

COMP D2

JP2

COMP C5

P

Component

Note

Supply

C4, C6

Vcc bypass capacitors (typ: 100nF)

U1

Standard voltage regulator to provide 5V supply voltage (SOT89). Omit this

component and close jumper JP1 if +5V is available externally.

C2

78L05 input capacitor (typ: 330nF)

C3

78L05 output capacitor (typ: 100nF)

D6

Zener diode 5.6V

JP1

Close this jumper if a +5V is is available externally