ZXLD1374(2010) 查看數據表（PDF） - Diodes Incorporated.

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ZXLD1374
(Rev.:2010)

60V HIGH ACCURACY 1.5A BUCK/BOOST/BUCK-BOOST LED DRIVER CONVERTER

Diodes Incorporated. 

A Product Line of

Diodes Incorporated

ZXLD1374

Electrical Characteristics (Test conditions: VIN = VAUX = 12V, TA = 25°C, unless otherwise specified.)

Symbol

Parameter

Conditions

Min Typ Max Units

Output Parameters

VFLAGL FLAG pin low level output voltage

Output sinking 1mA

0.5

V

IFLAGOFF FLAG pin open-drain leakage current VFLAG=40V

1

µA

Normal operation

4.2 4.5 4.8

Out of regulation (VSHP out of range)

(Note 7)

3.3

3.6

3.9

VIN under-voltage (VIN < 5.6V)

3.3 3.6 3.9

VSTATUS

STATUS Flag no-load output voltage

(Note 6)

Switch stalled (tON or tOFF> 100µs)

LX over-voltage state (VLX >60V)

3.3 3.6 3.9

2.4 2.7 3.0

V

Over-temperature (TJ > 125°C)

1.5 1.8 2.1

Excess sense resistor current

(VSENSE > 0.375V)

0.6 0.9 1.2

Excessive switch current (ISW>1.5A) 0.6 0.9 1.2

RSTATUS Output impedance of STATUS output Normal operation

10

kΩ

Low side switch output (LX pins tied together)

ILX-LG Low side switch leakage current

Output stage off, VLX = 60V (Note 8)

60

µA

RDS(ON) LX pin MOSFET on resistance

ILX = 1.5A (tON < 100µs)

0.5 0.8

Ω

tPDHL Propagation delay high-low

86

ns

tPDLH Propagation delay low-high

VSENSE = 225mV ± 30%, CL = 680pF,

131

ns

tLXR LX output rise time

RL = 120Ω

208

ns

tLXF LX output fall time

12

ns

tSTALL

Time to assert ‘STALL’ flag and

warning on STATUS output

(Note 9)

LX low or high

100 170 µs

LED Thermal control circuit (TADJ) parameters

VTADJH

VTADJL

ITADJ

Upper threshold voltage

Lower threshold voltage

TADJ pin Input current

Onset of output current reduction

(VTADJ falling)

Output current reduced to <10% of

set value (VTADJ falling)

VTADJ = 1.25V

560 625 690 mV

380 440 500 mV

1

µA

Notes: 6. In the event of more than one fault/warning condition occurring, the higher priority condition will take precedence. E.g.

‘Excessive coil current’ and ‘Out of regulation’ occurring together will produce an output of 0.9V on the STATUS pin. The

voltage levels on the STATUS output assume the Internal regulator to be in regulation and VADJ<=VREF. A reduction of the

voltage on the STATUS pin will occur when the voltage on VIN is near the minimum value of 6V.

7. Flag is asserted if VSHP<2.5V or VSHP>3.5V

8. With the device still in switching mode the LX pin has an over-voltage detection circuit connected to it with a resistance of

approximately 1MΩ.

9. If tON exceeds tSTALL, LX turns off and then an initiate a restart cycle occurs. During this phase, ADJ is grounded internally and

the SHP pin is switched to its nominal operating voltage, before operation is allowed to resume. Restart cycles will be repeated

automatically until the operating conditions are such that normal operation can be sustained. If tOFF exceeds tSTALL, the switch

will remain off until normal operation is possible.

ZXLD1374

Document number: DS35032 Rev. 1 - 2

Page 5 of 35

www.diodes.com

October 2010

© Diodes Incorporated

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