STR-F6600_SERIES.PDF

Series STR-F6600

INTERIM DATA SHEET

(Subject to change without notice)

February 22, 2000

OFF-LINE QUASI-RESONANT

FLYBACK SWITCHING REGULATORS

The Series STR-F6600 is specifically designed to satisfy the require-

ments for increased integration and reliability in off-line quasi-resonant

flyback converters. The series incorporates a primary control and drive

circuit with discrete avalanche-rated power MOSFETs.

FDBK

OSC.

LATCH

Covering the power range from below 25 watts up to 300 watts for

100/115/230 VAC inputs, and up to 150 watts for 85 to 265 VAC

universal input, these devices can be used in a range of applications,

from battery chargers and set top boxes, to televisions, monitors, and

industrial power supply units.

UVLO

OVP

TSD

Cycle-by-cycle current limiting, under-voltage lockout with hyster-

esis, over-voltage protection, and thermal shutdown protects the power

supply during the normal overload and fault conditions. Over-voltage

protection and thermal shutdown are latched after a short delay. The

latch may be reset by cycling the input supply. Low-current startup and

a low-power standby mode selected from the secondary circuit completes

a comprehensive suite of features. The series is provided in a five-pin

overmolded TO-3P style package, affording dielectric isolation without

compromising thermal characteristics.

Dwg. PK-011-1

Control Supply Voltage, V IN . . . . . . . . 35 V

Drain-Source Voltage, V DS

Series STR-F6620. . . . . . . . . . . . 450 V

Series STR-F6630. . . . . . . . . . . . 500 V

Series STR-F6650. . . . . . . . . . . . 650 V

Series STR-F6670. . . . . . . . . . . . 900 V

Drain Switching Current, I D . . . See Table

Peak Drain Current, I DM . . . . . . See Table

Avalanche Energy, E AS . . . . . . . See Table

OCP/FB Voltage Range,

V OCP . . . . . . . . . . . . . . . -0.3 V to +6 V

Package Power Dissipation, P D

control (V IN x I IN(ON) ) . . . . . . . . . 0.8 W

total . . . . . . . . . . . . . . . . . . . See Graph

FET Channel Temperature, T J . . . +150

FEATURES

Flyback Operation with Quasi-Resonant Soft Switching

for Low Power Dissipation and EMI

Rugged Avalanche-Rated MOSFET

Choice of MOSFET Voltage and r DS(on)

Full Over-Current Protection (no blanking)

Under-Voltage Lockout with Hysteresis

Over-Voltage Protection

Direct Voltage Feedback

Low Start-up Current (<400

Low-Frequency, Low-Power Standby Operation

Overmolded 5-Pin Package

Internal Frame Temperature, T F . . +125

Operating Temperature Range,

T A . . . . . . . . . . . . . . . -20

C to +125

Storage Temperature Range,

T S . . . . . . . . . . . . . . . . -40

C to +125

Always order by complete part number, e.g., STR-F6652 .

™

ABSOLUTE MAXIMUM RATINGS

at T A = +25

Series STR-F6600

OFF-LINE

QUASI-RESONANT FLYBACK

SWITCHING REGULATORS

FUNCTIONAL BLOCK DIAGRAM

V IN

DRIVE

REG.

UVLO

DRAIN

OVER-VOLT.

PROTECT

FAULT

LATCH

SOURCE

REF.

TSD

OSC

–

r SS

1.45 V

c SS

FEEDBACK &

OVER-CURRENT

PROTECTION

–

0.73 V

GROUND

Dwg. FK-002-6

1.0

0.8

0.6

Allowable package power dissipation curves

are shown on page 10.

0.4

0.2

100

STARTING CHANNEL TEMPERATURE in °

125

Dwg.

™

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

Series STR-F6600

OFF-LINE

QUASI-RESONANT FLYBACK

SWITCHING REGULATORS

OUTPUT MAXIMUM RATINGS at T A = +25

Part Number V DSS (V) r DS(on) (

)E AS (mJ)* I D (A)† I DM (A)

P OUT (W) at V IN (V rms)

STR-F6624 450 0.92 204 16 19 98 100

130 120

STR-F6626 450 0.58 327 16 26 145 100

190 120

STR-F6628 450 0.35 647 22 36 225 100

290 120

STR-F6632 500 2.54 7.4 9.0 11.2 36 100

50 120

STR-F6652 650 2.8 126 7.9 10 40 85-265

86 220

STR-F6653 650 1.95 260 5.6 14 58 85-265

120 220

STR-F6654 650 1.15 399 9.7 18 92 85-265

190 220

STR-F6656 650 0.71 521 16 25 150 85-265

300 220

STR-F6672 900 7.7 163 4.6 6.4 25 (no heatsink) 220

50 (with heat sink) 220

STR-F6674 900 4.49 242 6.0 9.2

85-265

220

STR-F6676 900 2.81 275 7.8 12

85-265

115

220

* Derate per graph, page 2

† Derate per graph, page 12

Series STR-F6600

OFF-LINE

QUASI-RESONANT FLYBACK

SWITCHING REGULATORS

ELECTRICAL CHARACTERISTICS at T A = +25

C, V IN = 18 V (unless otherwise specified).

Limits

Characteristic

Symbol Test Conditions

Min. Typ. Max. Units

On-State Voltage

V INT

Turn-on, increasing V IN

14.4 16 17.6 V

Under-Voltage Lockout

V INQ

Turn-off, decreasing V IN

9.0 10 11 V

Over-Voltage Threshold

V OVP(th)

Turn-off, increasing V IN

20.5 22.5 24.5 V

Drain-Source Breakdown Voltage V BR(DSS)

I D = 300

V DS max – – V

Drain Leakage Current

I DSS

At V DS max

– – 300

On-State Resistance

r DS(ON)

V S = 10 V, I D = 0.9 A, T J = +25

C– – see table

Maximum Off Time

t off

Drain waveform high

45 – 55

Minimum Pulse Duration for Input of

Quasi-Resonant Signals

t w(th)

Drain waveform high 1

– – 1.0

Minimum Off Time

t off

Drain waveform high 1

– – 1.5

Feedback Threshold Voltage

V FDBK

Drain waveform low to high 1

0.68 0.73 0.78 V

Oscillation synchronized 2

1.3 1.45 1.6 V

Over-Current Protection/Feedback

Sink Current

I OCP/FB

V OCP/FB = 1.0 V

1.2 1.35 1.5 mA

Latch Holding Current

I IN(OVP)

V IN reduced from 24.5 V to 8.5 V – – 400

Latch Release Voltage

V IN

I IN

A, V IN reduced from 24.5 V 6.6 – 8.4 V

Switching Time

t f

V DD = 200 V, I D = 0.9 A

– – 250 ns

Supply Current

I IN(ON)

Operating 3

– – 30 A

I IN(OFF)

Increasing V IN prior to oscillation – – 100

Insulation RMS Voltage

V WM(RMS)

All terminals simultaneous refer- 2000 – – V

ence to a metal plate against

the backside

Thermal Resistance

θ JM

Output channel to mounting frame – – 1.75

C/W

Thermal Shutdown

T J

140 – –

2. For quasi-resonant operation, the input signal must be longer than t w(th) and greater than V FDBK .

3. Feedback is square wave, V IM = 2.2 V, t h = 4

s, t l = 35

s, t l = 1

™

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

Notes: Typical Data is for design information only.

1. Feedback is square wave, V IM = 2.2 V, t h = 1

Series STR-F6600

OFF-LINE

QUASI-RESONANT FLYBACK

SWITCHING REGULATORS

Functional Description and Operation

The voltage on the V IN terminal (pin 4) controls startup

and shutdown of the Series STR-F6600 devices.

Figure 1 shows a typical start up circuit. The V IN

terminal voltage during startup is shown in figure 2.

At startup, C2 is charged through the startup resistor R S .

When the V IN terminal voltage reaches 16 V (typ.), the

control circuit enables regulator operation. Once the

regulator starts, it draws up to 30 mA from C2 causing the

voltage on C2 to fall momentarily. Once the regulator

output voltage is established, the drive winding D starts to

charge C2 via D2. The voltage on C2 thus recovers to the

nominal drive voltage (18 V).

As shown in figure 3, the input current is below 100

A (max.). To ensure latch

operation, the current in R S at the lowest ac input voltage

should be at least 500

I IN

I IN(ON)

30 mA

(MAX.)

Figure 1 – Start-Up Circuit

V IN

(MAX.)

I IN(OFF)

ON-STATE VOLTAGE (V INT )

16 V

(TYP.)

11 V

(MAX.)

14.4 V

(MIN.)

V IN

Figure 3 – Supply Terminal Current, I IN

11 V

(MAX.)

UNDER-VOLTAGE LOCKOUT (V INQ )

The value of R S thus determines the charge time of C2

and thus the startup delay. R S is typicaly 68 k

for wide

operation (90 V ac to 265 V ac) and 100 k

for 220 volt

DRIVE WINDING

VOLTAGE

ac operation.

The choice of C2 is a compromise between an accept-

able startup delay (in conjunction with R S ) and a hold-up

time sufficient to keep pin 4 above its under-voltage

shutdown threshold of 11 V. Typically C2 is in the range

of 47

STARTUP

DELAY

TIME

Figure 2 – Waveform of V IN Terminal Voltage

at Startup

F to 100

continued, next page...

(at T M = 25

C) prior to control circuit turn on. The latch

circuit holding current is 400

100

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