ZXLD1374

ZXLD1374

Document number: DS35032 Rev. 1 - 2

Page 5 of 35

www.diodes.com

October 2010

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Symbol

Parameter

Conditions

Min

Typ

Max

Units

Output Parameters

FLAG pin low level output voltage

Output sinking 1mA

0.5

V

FLAG pin open-drain leakage current

1

µA

STATUS Flag no-load output voltage

(Note 6)

Normal operation

4.2

4.5

4.8

V

(Note 7)

3.3

3.6

3.9

3.3

3.6

3.9

3.3

3.6

3.9

2.4

2.7

3.0

1.5

1.8

2.1

Excess sense resistor current

0.6

0.9

1.2

0.6

0.9

1.2

Output impedance of STATUS output

Normal operation

10

k

Ω

Low side switch output (LX pins tied together)

Low side switch leakage current

60

µA

LX pin MOSFET on resistance

0.5

0.8

Ω

Propagation delay high-low

86

ns

Propagation delay low-high

131

ns

LX output rise time

208

ns

LX output fall time

12

ns

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

Upper threshold voltage

Onset of output current reduction

560

625

690

mV

Lower threshold voltage

Output current reduced to <10% of

380

440

500

mV

TADJ pin Input current

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

7.

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 1M

Ω.

9.

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

will remain off until normal operation is possible.