www.powerint.com

February 2009

TNY263-268

TinySwitch-II Family

Enhanced, Energy Efficient, Low Power

Off-line Switcher

®

Figure 1.

Typical Standby Application.

Product Highlights

TinySwitch-II Features Reduce System Cost

Fully integrated auto-restart for short circuit and open loop fault

protection – saves external component costs

Built-in circuitry practically eliminates audible noise with ordinary

dip-varnished transformer

Programmable line undervoltage detect feature prevents power

on/off glitches – saves external components

Frequency jittering dramatically reduces EMI (~10 dB)

– minimizes EMI filter component costs

132 kHz operation reduces transformer size – allows use of

EF12.6 or EE13 cores for low cost and small size

Very tight tolerances and negligible temperature variation on key

parameters eases design and lowers cost

Lowest component count switcher solution

Expanded scalable device family for low system cost

Better Cost/Performance over RCC & Linears

Lower system cost than RCC, discrete PWM and other

integrated/hybrid solutions

Cost effective replacement for bulky regulated linears

Simple ON/OFF control – no loop compensation needed

No bias winding – simpler, lower cost transformer

Simple design practically eliminates rework in manufacturing

EcoSmart

No load consumption <50 mW with bias winding and

<250 mW without bias winding at 265 VAC input

Meets California Energy Commission (CEC), Energy Star, and

EU requirements

Ideal for cell-phone charger and PC standby applications

High Performance at Low Cost

High voltage powered – ideal for charger applications

High bandwidth provides fast turn on with no overshoot

Current limit operation rejects line frequency ripple

Built-in current limit and thermal protection improves safety

Description

TinySwitch-II integrates a 700 V power MOSFET, oscillator, high

voltage switched current source, current limit and thermal

shutdown circuitry onto a monolithic device. The start-up and

operating power are derived directly from the voltage on the

DRAIN pin, eliminating the need for a bias winding and

associated circuitry. In addition, the TinySwitch-II devices

incorporate auto-restart, line undervoltage sense, and frequency

jittering. An innovative design minimizes audio frequency

components in the simple ON/OFF control scheme to practically

eliminate audible noise with standard taped/varnished

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PI-2684-021809

Wide-Range

HV DC Input

D

S

EN/UV

BP

+

-

+

-

DC

Output

TinySwitch-II

Optional

UV Resistor

transformer construction. The fully integrated auto-restart circuit

safely limits output power during fault conditions such as output

short circuit or open loop, reducing component count and

secondary feedback circuitry cost. An optional line sense resistor

externally programs a line undervoltage threshold, which

eliminates power down glitches caused by the slow discharge of

input storage capacitors present in applications such as standby

supplies. The operating frequency of 132 kHz is jittered to

significantly reduce both the quasi-peak and average EMI,

minimizing filtering cost.

Output Power Table

230 VAC ± 15%

85-265 VAC

Open

Open

TNY263 P/G

5 W

7.5 W

3.7 W

4.7 W

TNY264 P/G

5.5 W

9 W

4 W

6 W

TNY265 P/G

8.5 W

11 W

5.5 W

7.5 W

TNY266 P/G

10 W

15 W

6 W

9.5 W

TNY267 P/G

13 W

19 W

8 W

12 W

TNY268 P/G

16 W

23 W

10 W

15 W

Table 1.

Output Power Table.

Notes:

1. Minimum continuous power in a typical non-ventilated enclosed adapter

measured at 50 °C ambient.

2. Minimum practical continuous power in an open frame design with adequate

heat sinking, measured at 50 °C ambient (See Key Applications

Considerations).

3. Packages: P: DIP-8B, G: SMD-8B. Please see Part Ordering Information.