ZXLD1100 데이터 시트보기 (PDF) - Diodes Incorporated.

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ZXLD1100

ADJUSTABLE LED DRIVER WITH INTERNAL SWITCH AND OPEN CIRCUIT PROTECTION IN SC70-6

Diodes Incorporated. 

ZXLD1100

ELECTRICAL CHARACTERISTICS (at VIN = 3V, Tamb = 25°C unless otherwise stated(1))

SYMBOL PARAMETER

CONDITIONS

MIN. TYP. MAX. UNIT

VIN

Input voltage

IIN

Supply current

Quiescent

2.5

5.5 V

VEN = VIN, ILX = 0,

Output not switching

60 100 ␮A

VFB

IFB

fLX

TOFF

TON

ILXpk

RLX

ILX(leak)

VOUT

Shutdown

FB pin control voltage

FB pin input current

Operating frequency

LX output 'OFF' time

LX output 'ON' time (2)

Switch peak current limit

Switch 'On' resistance

Switch leakage current

Controller output voltage

VEN = 0V

L=10␮H, VOUT =10V,

IOUT=20mA

L=10␮H, VOUT =10V,

IOUT=20mA

VLX =20V

Normal operation

VSENSE pin

open-circuit or

grounded

500 nA

90.5

109.5 mV

100 nA

0.35 1 MHz

350 500

ns

5

µs

320

mA

1.5

⍀

1

µA

28

V

VOUT(MAX)

Controller output voltage with output

open circuit (3)

VSENSE connected to

Vout

25

30

V

VENH

VENL

IENL

IENH

TEN(hold)

EN pin High level Input voltage

EN pin Low level Input voltage

EN pin Low level input current

EN pin High level input current

EN pin turn off delay (4)

Device active

Device in shutdown

VEN =0V

VEN =VIN

VEN switched from

high to low

1.5

VIN

V

0.4 V

-100 nA

1

␮A

120

µs

∆T/T

fLPF

PWM duty cycle range at ‘EN’ input for

filtered PWM control (5)

Internal PWM low pass filter cut-off

frequency

10kHz < f < 100kHz,

VENH =VIN

20

100 %

4

kHz

ALPF

Filter attenuation

f=30kHz

52.5

dB

NOTES:

(1) Production testing of the device is performed at 25°C. Functional operation of the device over a -40°C to +85°C temperature range is

guaranteed by design, characterization and process control.

(2) Nominal 'on' time (TONnom) is defined by the input voltage (VIN), coil inductance (L) and peak current (ILXpkdc) according to the expression:

TONnom = {ILX(pkdc) x L/VIN} +200ns.

(3) When using the open circuit protection feature, the maximum output voltage under normal operation should be maintained below the

minimum value specified, in order to prevent possible disturbance of the current control loop.

(4) This is the time for which the device remains active after the EN pin has been asserted low. This delay is necessary to allow the output to be

maintained during dc PWM mode operation.

(5) The minimum PWM signal frequency during this mode of operation is to ensure that the device remains active during PWM control. This

provides a continuous dc output current. For lower frequencies, the device will be gated 'on' and 'off' during PWM control.

(6) The maximum PWM signal frequency during this mode of operation should be kept as low as possible to minimize errors due to the turn-off

delay of the device (see Enable pin turn-off delay).

ISSUE 4 - JULY 2004

3

SEMICONDUCTORS

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