TNY263-268 Ver la hoja de datos (PDF) - Power Integrations, Inc

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TNY263-268

TinySwitch-II Family Enhanced, Energy Efficient, Low Power Off-line Switcher

Power Integrations, Inc 

TNY263-268

BYPASS

(BP)

240 µA

50 µA

LINE UNDER-VOLTAGE

AUTO-

RESTART

COUNTER

FAULT

PRESENT

6.3 V

RESET

ENABLE

1.0 V + VT

ENABLE/

UNDER-

VOLTAGE

(EN/UV)

1.0 V

JITTER

CLOCK

DCMAX

OSCILLATOR

Figure 2. Functional Block Diagram.

Pin Functional Description

DRAIN (D) Pin:

Power MOSFET drain connection. Provides internal operating

current for both start-up and steady-state operation.

BYPASS (BP) Pin:

Connection point for a 0.1 µF external bypass capacitor for the

internally generated 5.8 V supply.

ENABLE/UNDER-VOLTAGE (EN/UV) Pin:

This pin has dual functions: enable input and line under-voltage

sense. During normal operation, switching of the power

MOSFET is controlled by this pin. MOSFET switching is

terminated when a current greater than 240 µA is drawn from

this pin. This pin also senses line under-voltage conditions

through an external resistor connected to the DC line

voltage. If there is no external resistor connected to this pin,

TinySwitch-II detects its absence and disables the line under-

voltage function.

2

G

4/05

REGULATOR

5.8 V

CURRENT

LIMIT STATE

MACHINE

+

-

5.8 V

4.8 V

BYPASS PIN

UNDER-VOLTAGE

VILIMIT

CURRENT LIMIT

COMPARATOR

DRAIN

(D)

THERMAL

SHUTDOWN

S

Q

R

Q

LEADING

EDGE

BLANKING

SOURCE

(S)

PI-2643-030701

P Package (DIP-8B)

G Package (SMD-8B)

BP 1

S2

S3

EN/UV 4

8 S (HV RTN)

7 S (HV RTN)

5D

Figure 3. Pin Configuration.

PI-2685-101600

SOURCE (S) Pin:

Control circuit common, internally connected to output

MOSFET source.

SOURCE (HV RTN) Pin:

Output MOSFET source connection for high voltage return.

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