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TK75020

ZVS RESONANT CONTROLLER

Toko America Inc  

TK75020

TK75020 ELECTRICAL CHARACTERISTICS (CONT.)

Test conditions: VCC = 12 V, VEN = 2.4 V, CT = 360 pF, ITON / SS = ITOFF(MAX) = 50 µA, DRV is Open, TA = Full Operating

Temperature Range, Typical numbers apply at TA = 25 °C, unless otherwise specified.

SYMBOL

PARAMETER

TEST CONDITIONS

MAXIMUM OFF-TIME SETTING SECTION (TOFF(MAX) PIN)

IT(OFF, MAX)

Short Circuit Current

VT(OFF, MAX) = 0 V

VT(OFF, MAX)

Pin Voltage

IT(OFF, MAX) = 0 mA

TIMING SECTION (CT PIN)

VCT(LOW)

Low Threshold Voltage

VCT(HIGH)

High Threshold Voltage

f

Oscillator Frequency

CTRTON

Current Transfer Ratio to CT Pin,

On-time Setting

VCT = 4 V

CTRTOFF(MAX)

Current Transfer Ratio to CT Pin,

Max Off-time Setting

VCT = 0 V

ZERO VOLTAGE DETECTOR SECTION (ZVD PIN)

VZVD(TH)

Detector Low Threshold

TA = 25 ° C

IZVD

Input Current

VZVD = 2 V

tZVD(DRV)

Delay to DRV

VZVD Steps From 5 to 0 V,

CDRV = 1 nF

OVERDISSIPATION DETECTOR SECTION (ODP PIN)

VODP(TH)

Detection Threshold Volage

IODP(AVG)

Average Current

f = 100 kHz, TOVERLAP = 200 ns

OVERVOLTAGE DETECTOR SECTION (OVP PIN)

VOVP(TH)

tOVP(D)

Detection Threshold Volage

Dealy to DRV

MIN

1.8

0.9

2.7

115

-6.2

4.75

1.8

-50

0.45

3.6

TYP

2.5

2.0

1.0

3.0

140

-5.5

5.25

2.0

170

0.70

0.6

4.0

350

MAX UNITS

mA

2.2

V

1.1

V

3.3

V

165 kHz

-4.8

5.75

2.2

V

0

µA

300

ns

0.95

V

µA

4.3

V

800

ns

Page 4

January 1999 TOKO, Inc.

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