ZXLD1321 Ver la hoja de datos (PDF) - Zetex => Diodes

Número de pieza

componentes Descripción

Fabricante

ZXLD1321

Boost mode DC-DC converter for LED driving with 1A output and current control

Zetex => Diodes 

ZXLD1321

Electrical characteristics (Test conditions: VIN = 3V, TAMB= 25°C unless otherwise stated(a))

DC-DC converter supply parameters

Symbol Parameter

Conditions

Min Typ Max Units

VIN

Supply voltage

Normal operation 2.0

12

V

VIN(Start) Supply voltage for start-up(b)

Start-up mode

1.2

2.4 V

VUV-

Under-voltage detection threshold VIN falling

Normal operation to start-up mode

1.8

V

VUV+

Under-voltage detection threshold VIN rising

Start-up mode to normal operation

2.2

V

Iq

Quiescent current

Measured into VIN

1.5

mA

ADJ pin floating.

(Excluding switch

base current).

ISTBY

Standby current

Measured into VIN.

ADJ pin grounded

12 20 µA

VREF

Internal reference voltage

ADJ pin floating

2.0V<VIN<18V

480 500 520 mV

TCO(REF) Internal reference temperature

coefficient.

50

ppm

/K

NOTES:

(a) Production testing of the device is performed at 25°C. Functional operation of the device and parameters specified from -40°C to

+125°C are guaranteed by design, characterisation and process control.

(b) Between 1.2V and 2.2V the device will run in the Low Voltage Startup Mode (for details refer to section "Low Voltage Operation")

DC-DC converter input parameters

Symbol

VSENSE

VSENSE

(SU)

Parameter

Peak switch current sense

voltage

Peak switch current sense

voltage in start-up mode

ISENSE

Sense input current

CFB

Control loop compensation

capacitor

VADJ

External dc control voltage

applied to ADJ pin to adjust

output current

VADJ(th)

Switching threshold of ADJ

pin

TCO(VADJ) Temperature coefficient of

VADJ(th)

RADJ

Internal resistor between

VREF and ADJ

VADJ(clmp) Clamp voltage on ADJ pin

Conditions

Min

Measured on ISENSE 45

pin CFB pin at 0V

Measured on ISENSE

pin.

Start-up mode

VIN=1.2V

Measured into

-15

ISENSE with pin at

0V. CFB pin at 0V

DC brightness

50

control mode

Standby state to

26

normal operation

VADJ<500mV

100µA injected into

ADJ pin

Typ Max Units

55 65 mV

10.5

mV

-7 -1 µA

10

nF

500 mV

28 30 mV

+0.3

%/K

100

kΩ

575

mV

Issue 1 - January 2008

5

© Zetex Semiconductors plc 2008

www.zetex.com

Share Link: