TOP242-249 datasheet(5/48 Pages) POWERINT

Part #	TOP242-249

Description	Family Extended Power, Design Flexible,Integrated Off-line Switcher

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Manufacturer	POWERINT [Power Integrations, Inc.]

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TOP242-249

5

August 8, 2000

E

7/01

TOPSwitch-GX Family Functional Description

Like TOPSwitch, TOPSwitch-GX is an integrated switched

mode power supply chip that converts a current at the control

input to a duty cycle at the open drain output of a high voltage

power MOSFET. During normal operation the duty cycle of the

power MOSFET decreases linearly with increasing CONTROL

pin current as shown in Figure 7.

In addition to the three terminal TOPSwitch features, such as the

high voltage start-up, the cycle-by-cycle current limiting, loop

compensation circuitry, auto-restart, thermal shutdown, the

TOPSwitch-GX incorporates many additional functions that

reduce system cost, increase power supply performance and

design flexibility. A patented high voltage CMOS technology

allows both the high voltage power MOSFET and all the low

voltage control circuitry to be cost effectively integrated onto a

single monolithic chip.

Three terminals, FREQUENCY, LINE-SENSE, and

EXTERNAL CURRENT LIMIT (available in Y or R package)

or one terminal MULTI-FUNCTION (available in P or G

Package) have been added to implement some of the new

functions. These terminals can be connected to the SOURCE

pin to operate the TOPSwitch-GX in a TOPSwitch-like three

terminal mode. However, even in this three terminal mode, the

TOPSwitch-GX offers many new transparent features that do

not require any external components:

1. A fully integrated 10 ms soft-start limits peak currents and

voltages during start-up and dramatically reduces or

eliminates output overshoot in most applications.

2. DC

MAX of 78% allows smaller input storage capacitor, lower

input voltage requirement and/or higher power capability.

3. Frequency reduction at light loads lowers the switching

losses and maintains good cross regulation in multiple

output supplies.

4. Higher switching frequency of 132 kHz reduces the

transformer size with no noticeable impact on EMI.

5. Frequency jittering reduces EMI.

6. Hysteretic over-temperature shutdown ensures automatic

recovery from thermal fault. Large hysteresis prevents circuit

board overheating.

7. Packages with omitted pins and lead forming provide large

drain creepage distance.

8. Tighter absolute tolerances and smaller temperature vari-

ations on switching frequency, current limit and PWM gain.

The LINE-SENSE (L) pin is usually used for line sensing by

connecting a resistor from this pin to the rectified DC high

voltage bus to implement line overvoltage (OV), under-voltage

(UV) and line feed forward with DC

MAX reduction.

In this

mode, the value of the resistor determines the OV/UV thresholds

and the DC

MAX is reduced linearly starting from a line voltage

above the under-voltage threshold. See Table 2 and Figure 11.

The pin can also be used as a remote ON/OFF and a

synchronization input.

The EXTERNAL CURRENT LIMIT (X) pin is usually used to

reduce the current limit externally to a value close to the operating

peak current, by connecting the pin to SOURCE through a

resistor. This pin can also be used as a remote ON/OFF and a

synchronization input in both modes. See Table 2 and Figure 11.

For the P or G packages the LINE-SENSE and EXTERNAL

CURRENT LIMIT pin functions are combined on one MULTI-

FUNCTION (M) pin. However, some of the functions become

mutually exclusive as shown in Table 3.

The FREQUENCY (F) pin in the Y or R package sets the

switching frequency to the default value of 132 kHz when

connected to SOURCE pin. A half frequency option of 66 kHz

can be chosen by connecting this pin to CONTROL pin instead.

Leaving this pin open is not recommended.

PI-2633-060500

I

C (mA)

TOP242/5 1.6 2.0

TOP246/9 2.2 2.6

5.2

6.0

5.8

6.6

I

CD1

I

B

Auto-restart

I

L

= 125

µA

I

L

< I

L(DC)

I

L

= 190

µA

78

10

38

I

C (mA)

30

I

CD1

I

B

Auto-restart

132

Note: For P and G packages I

L is replaced with IM.

I

L

< I

L(DC)

I

L

= 125

µA

Slope = PWM Gain

I

L

= 190

µA

Figure 7. Relationship of Duty Cycle and Frequency to CONTROL

Pin Current.

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