TIL5942, TIL5942A

CURRENT-MODE-PWM CONTROLLER

WITH OPTOISOLATED VOLTAGE REFERENCE AND ERROR AMPLIFIER

SOES040 – OCTOBER 1997

5

POST OFFICE BOX 655303

voltage reference/error amplifier

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

V f

Reference voltage

TA = 25°C,

VO(COMP) = VI(FB)

TIL5942

2.48

2.5

2.52

V

Vref

Reference voltage

O(COMP)

I(FB)

II(LED) = 10 mA,

See Figure 2

TIL5942A

2.49

2.5

2.51

V

Vref(dev)

Deviation of reference voltage over

temperature

TA = 25°C to 100°C,

VO(COMP) = VI(FB)

II(LED) = 10 mA,

See Figure 2

25

mV

Ratio of reference voltage change to

change in input light-emitting-diode voltage

∆VI(LED) = 4 V to 37 V,

II(LED) = 10 mA

1.1

2

mV/V

II(FB)

Feedback input current

II(LED) = 10 mA,

See Figure 4

R3 = 10 k

Ω

1.5

3

µA

Iref(dev)

Deviation of reference input current over

full temperature range

II(LED) = 10 mA,

TA = 25°C to 100°C

R3 = 10 k

Ω,

See Figure 4

0.5

µA

IDRV(min)

Minimum drive current

TA = 25°C,

VO(COMP) = VI(FB)

0.4

1

mA

II(off)

Off-state input light-emitting diode current

VI(LED) = 37 V,

See Figure 5

VI(FB) = 0

0.18

0.5

µA

Zka†

Regulator output impedance

VO(COMP) = VI(FB)

IO(COMP) = 1 mA to 50 mA

f

≤ 1 kHz

0.1

† This symbol is not currently listed within EIA or JEDEC standards for semiconductor symbology.

LED

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VF

Forward voltage

TA = 25°C, VO(COMP) = VI(FB), II(LED) = 10 mA,

See Figure 2

1.2

1.4

V

IR

LED reverse current

VO = 6 V

10

µA

PWM Section

voltage reference

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Vref

Reference voltage

IO = 1 mA,

TJ = 25°C

4.95

5

5.05

V

Vref(line reg)

Reference line regulation

VCC = 11 V to 30 V

50

mV

Vref(load reg)

Reference load regulation

IO = 0 mA to 20 mA

25

mV

V f(t

)

Reference temperature regulation

TA = 25°C to 100°C

–4

mV

Vref(temp reg) Reference temperature regulation

TA = 25°C to –40°C

–4

mV

oscillator

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

fosc

Frequency

R = 3.9 k

Ω,

C = 1 nF

225

250

275

kHz

t(off)

Dead time, (minimum off time)

100

148

200

ns

Minimum timing ramp voltage

0.5

V

Peak timing ramp voltage

3.2

V

DV

ref

DV

I(LED)