Diodes ZXLD1374 - Manual (Page 6)

ZXLD1374
Document number: DS35032 Rev. 3 - 2
6 of 39
www.diodes.com
September 2012
© Diodes Incorporated
ZXLD1374
A Product Line of
Diodes Incorporated
Electrical Characteristics
(V
IN
= V
AUX
= 12V, @T
A
= +25°C, unless otherwise specified.)
Symbol Parameter Conditions Min Typ Max Units
Supply and Reference Parameters
V
UV-
Under-Voltage Detection Threshold
Normal Operation to Switch Disabled
V
IN
or V
AUX
falling (Note 10) 5.2 5.6 6.3
V
V
UV+
Under-Voltage Detection Threshold
Switch Disabled to Normal Operation
V
IN
or V
AUX
rising (Note 10) 5.5 6 6.5
V
I
Q-IN
Quiescent Current into V
IN PWM pin floating.
Output not switching 1.5 3 mA
I
Q-AUX
Quiescent Current into V
AUX
150 300 µA
I
SB-IN
Standby Current into V
IN
.
PWM pin grounded for more than 15ms
90 150 µA
I
SB-AUX
Standby Current into V
AUX
. 0.7 10 µA
V
REF
Internal Reference Voltage No load 1.237 1.25 1.263 V
ΔV
REF
Change in Reference Voltage with Output
Current Sourcing 1mA -5
mV
Sinking 25µA 5
V
REF_LINE
Reference Voltage Line Regulation V
IN
= V
AUX
, 6.5V < V
IN
= <60V -60 -90 dB
V
REF-TC
Reference Temperature Coefficient +/-50 ppm/°C
DC-DC Converter Parameters
V
ADJ
External DC Control Voltage Applied to ADJ Pin
to Adjust Output Current (Note 11) DC brightness control mode
10% to 200%
0.125 1.25 2.5 V
I
ADJ
ADJ Input Current (Note 11)
V
ADJ
≤ 2.5V
V
ADJ
= 5.0V
100
5
nA
µA
V
GI
GI Voltage Threshold for Boost and Buck-Boost
Modes Selection (Note 11)
V
ADJ
= 1.25V 0.8 V
I
GI
GI Input Current (Note 11)
V
GI
≤ 2.5V
V
GI
= 5.0V
100
5
nA
µA
I
PWM
PWM Input Current V
PWM
= 5.5V 36 100 µA
t
PWMoff
PWM Pulse Width
(to enter shutdown state)
PWM input low 10 15 25 ms
T
SDH
Thermal Shutdown Upper Threshold
(LX output inhibited)
Temperature rising 150 °C
T
SDL
Thermal Shutdown Lower Threshold
(LX output re-enabled)
Temperature falling 125 °C
High-Side Current Monitor (Pin ISM)
I
ISM
Input Current Measured into ISM pin and V
ISM
= V
IN
11 20 µA
V
SENSE_acc
Accuracy of Nominal V
SENSE
Threshold Voltage
V
ADJ
= 1.25V
±0.25 ±2 %
V
SENSE-OC
Over-Current Sense Threshold Voltage 300 350 375 mV
Notes: 10. UVLO levels are such that all ZXLD1374 will function above 6.5V for rising supply voltages and function down to 6.3V for falling supply voltages.
11. The ADJ and GI pins have an internal clamp that limits the internal node to less than 3V. This limits the switch current should those pins get
overdriven.