LNK3205PSLASHGSLASHD datasheet(2/28 Pages) POWERINT

2 / 28 page

Rev. Q 06/23

LinkSwitch-TN2

www.power.com

Figure 3. Functional Block Diagram. (*Only size 8 P/G Package)

Pin Functional Description

DRAIN (D) Pin:

Power MOSFET drain connection. Provides internal operating current

for both start-up and steady-state operation.

BYPASS (BP/M) Pin:

This pin has multiple functions:

• It is the connection point for an external bypass capacitor for the

internally generated 5.0 V supply.

• It is a mode selector for the current limit value, depending on the

value of the capacitance added. Use of a 0.1 μF capacitor results

in the standard current limit value. Use of a 1 μF capacitor results

in the current limit being reduced, allowing design with lowest cost

surface mount buck chokes.

• It provides a shutdown function. When the current into the BYPASS

pin exceeds I

BPSD for a time equal to 2 to 3 cycles of the internal

oscillator (f

OSC), the device enters auto-restart. This can be used to

provide an output overvoltage protection function with external

circuitry.

FEEDBACK (FB) Pin:

During normal operation, switching of the power MOSFET is con-

trolled by the FEEDBACK pin. MOSFET switching is terminated when

a current greater than I

FB (49 μA) is delivered into this pin. Line

overvoltage protection is detected when a current greater than I

FBSD

(670 μA) is delivered into this pin for 2 consecutive switching cycles.

PI-7842e-030822

D Package (SO-8C)

BP/M

S/G*

BP/M

P Package (DIP-8C)

G Package (SMD-8C)

Figure 4. Pin Configuration. (*G for size LNK3208/9)

PI-7879b-030822

CLOCK

JITTER

OSCILLATOR

5.0 V

4.5 V

SOURCE

(S)

DCMAX

AUTO-RESTART

COUNTER

CLOCK

RESET

BYPASS

(BP/M)

VILIMIT

OVL

LEADING

EDGE

BLANKING

OVP

DETECT

THERMAL

SHUTDOWN

DRAIN

(D)

REGULATOR

5.0 V

BYPASS PIN

CAPACITOR

DETECT

BYPASS PIN

UNDERVOLTAGE

FAULT

PRESENT

CURRENT LIMIT

COMPARATOR

FEEDBACK

(FB)

GROUND

(G)*

5.2 V

2.0 V -VT

IFBSD

IFB

SOURCE (S) Pin:

This pin is the power MOSFET source connection. It is also the

ground reference for the BYPASS and FEEDBACK pins.

GROUND (G) Pin:

Size LNK3208/9 P/G package only.

Ground reference for the BYPASS and FEEDBACK.

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