ZXLD1322 Ver la hoja de datos (PDF) - Zetex => Diodes

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Fabricante

ZXLD1322

Buck/boost mode DC-DC converter for LED driving with 700mA output and current control

Zetex => Diodes 

ZXLD1322

Electrical characteristics (Test conditions: VIN = 4V, TAMB= 25°C unless otherwise stated(a))

DC-DC converter supply parameters

Symbol Parameter

Conditions

Min Typ Max Units

VIN

Supply voltage

Normal operation 2.5

15

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

Internalreference voltage

ADJ pin floating

2.5V<VIN<15V

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 Parameter

Conditions

Min Typ Max Units

VSENSE

Peak switch current sense

voltage

Measured on ISENSE 45 55 65 mV

pin CFB pin at 0V

VSENSE

Peak switch current sense

Measured on ISENSE

10.5

mV

(SU)

voltage in start-up mode

pin.

Start-up mode

VIN=1.2V

ISENSE

Sense input current

Measured into

ISENSE with pin at

0V.CFB pin at 0V

-15 -7

-1 µA

CFB

Control loop compensation

capacitor

10

nF

VADJ

External dc control voltage

DC brightness

50

applied to ADJ pin to adjust control mode

output current

500 mV

VADJ(th)

Switching threshold of ADJ pin Standby state to

Normal operation

26 28 30 mV

TCO(VADJ) Temperature coefficient of

VADJ(th)

+0.3

%/K

RADJ

Internal resistor between VREF VADJ<500mV

and ADJ

100

kΩ

VADJ(clmp) Clamp voltage on ADJ pin

100µA injected into

ADJ pin

575

mV

Issue 1 - January 2008

5

© Zetex Semiconductors plc 2008

www.zetex.com

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