L4075

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

4 of 5

www.unisonic.com.tw

QW-R125-030.a

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Input Voltage

6

40

V

Quiescent Supply Current with Output Off

ADJ Pin Grounded

40

60

80

μA

Quiescent Supply Current with Output

Switching

ADJ Pin Floating

450

600

μA

Mean Current Sense Threshold Voltage

113

mV

Sense Threshold Hysteresis

±15

%

8

10

μA

Internal Reference Voltage

Measured on ADJ Pin with

Pin Floating

1.2

V

External Control Voltage Range On ADJ Pin

for DC Brightness Control

0.3

1.2

V

DC Voltage On ADJ Pin to Switch Chip from

Active (On) State to Quiescent (Off) State

0.15

0.2

0.25

V

DC Voltage On ADJ Pin to Switch Chip from

Quiescent (Off) State to Active (On) State

0.2

0.25

0.3

V

500

KΩ

Continuous LX Switch Current

0.35

A

LX Switch Leakage Current

1

μA

LX Switch “On” Resistance

0.9

1.5

Ω

Minimum Switch “ON” Time

LX Switch “ON”

200

ns

Minimum Switch “OFF” Time

LX Switch “OFF”

200

ns

Brightness Control Range at Low Frequency

PWM Signal

PWM Frequency=100Hz,

PWM Amplitude=5V,

L=27μH

1200:1

Brightness Control Range at Low Frequency

PWM Signal

PWM Frequency=10KHz,

PWM Amplitude=5V,

L=27μH

13:1

Operating Frequency

ADJ Pin Floating L=100Μh

154

KHz

Recommended Maximum Operating

Frequency

1

MHz

Recommended Duty Cycle Range of Output

0.3

0.7

0.9

Internal Comparator Propagation Delay

50

ns

Thermal Shutdown Temperature

140

°C

Thermal Shutdown Hysteresis

20

°C

Note: Production testing of the chip is performed at 25°C. Functional operation of the chip and parameters specified

are guaranteed by design, characterization and process control in other temperature.