UC1826 datasheet(3/11 Pages) TI

Part #	UC1826

Description	Secondary Side Average Current Mode Controller

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Manufacturer	TI [Texas Instruments]

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3

PARAMETER

TEST CONDITION

MIN

TYP

MAX

UNITS

Voltage Error Amplifier (cont.)

GBW (Note 2)

f

= 200kHz

7

MHz

Vol

IO

= 175mA, Volts above VEE

0.6

V

Voh

ILIM

= 3V

2.85

3

3.15

V

Voh-ILIM

Tested ILIM

= 0.5V, 1.0V, 2.0V

−100

100

mV

2X Amplifier and Share Amplifier

V offset (b; y = mx + b)

20

mV

GAIN (m; y = mx + b)

Slope with AVOUT

= 1V and 2V

1.98

2.02

V

GBW (Note 2)

100

kHZ

RSHARE

VCC

= 0, VSHARE/ISHARE

200

k

Ω

Total Offset

Negative supply is VEE, GND Open,VAO = GND

−75

0

75

mV

Vol

VAO = Voltage Amp Vol, Volts above VEE

0.2

0.45

0.6

V

Voh

IO

= 0mA, ILIM = 3V, VAO = Voltage Amp Voh

5.7

6

6.3

V

IO

=

−1mA, ILIM = 3V, VAO = Voltage Amp Voh

5.7

6

6.3

V

Adjust Amplifier

Vio

40

60

80

mV

gm

IO =

−2µA to 2µA, CADJ = 0.1µF

−0.1

−0.3

mS

Vol

IOUT

= 0

0.9

1

1.1

V

IOUT

= 2µA

0.85

1

1.15

V

Voh

IOUT

= 0, VSHARE = 6.5V

5.7

6

6.3

V

IOUT

=−2µA, VSHARE = 6.5V

5.7

6

6.3

V

Oscillator

Frequency

450

500

550

kHz

Max Duty Cycle

72

76

80

%

OSC Ramp Amplitude

2

2.2

2.4

V

Ramp Saturation

IO

= 10mA, OSC = 0V

0.44

0.8

V

Clock Driver/SYNC (CLKSYN)

Vol

0.02

0.2

V

Voh

3.6

V

RCLKSYN = 200

Ω

3.5

V

ISOURCE

25

mA

RCLKSYN

VCC = 0, VCLKSYN/ICLKSYN

10

k

VTH

1.5

V

VREF Comparator

Turn-on Threshold

4.65

V

Hysteresis

0.4

V

VCC Comparator

Turn-on Threshold

7.9

8.4

8.9

V

Hysteresis

0.4

V

PWR Sense Comparator

Voltage Threshold

1.25

V

Vol

IO

= 1mA

0.3

0.4

V

Voh

IO

=−100µA4

V

KILL Comparator

Voltage Threshold

3V

UC1826

UC2826

UC3826

ELECTRICAL CHARACTERISTICS (cont.) Unless otherwise stated these specifications apply for TA

=

−55°Cto

+125°C for UC1826; −40°C to +85°C for UC2826; and 0°C to +70°C for UC3826;VCC = 12V, VEE = GND, Output no load, CT =

345pF, RT

= 4kΩ, RDEAD = 1000Ω, CRAMP = 345pF, RRAMP = 35.2kΩ, RCLKSYN = 1k, TA = TJ.

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