Diodes ZXLD1370 - Manual (Page 6)

ZXLD1370
Document number: DS32165 Rev. 5 - 2
6 of 39
www.diodes.com
September 2012
© Diodes Incorporated
ZXLD1370
A Product Line of
Diodes Incorporated
Electrical Characteristics
(Note 5) (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 5.2 5.6 6.3 V
V
UV+
Under-Voltage detection threshold
Switch disabled to normal operation
V
IN
or V
AUX
rising 5.5 6.0 6.5 V
I
Q-IN
Quiescent current into V
IN PWM pin floating.
Output not switching 1.5 3.0 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 10.0 µA
V
REF
Internal reference voltage No load 1.237 1.250 1.263 V
ΔV
REF
Change in reference voltage with output
current Sourcing 1mA -5
mV
Sinking 100µA 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 8) DC brightness control mode
10% to 200%
0.125 1.25 2.50 V
I
ADJ
ADJ input current (Note 10)
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 8)
V
ADJ
= 1.25V 0.8 V
I
GI
GI input current (Note 10)
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
(GATE output forced low)
Temperature rising. 150 °C
T
SDL
Thermal shutdown lower threshold
(GATE output re-enabled)
Temperature falling. 125 °C
High-Side Current Monitor (Pin ISM)
I
ISM
Input Current @ V
ISM
= 12V 11 20 µA
V
SENSE
Current measurement sinse voltage
Buck
V
ADJ
= 1.25V
218
mV Boost (Note 11) 225
Buck-Boost (Note 11)
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. The ADJ and GI pins have an internal clamp that limits the internal node to less than 3V. This provides some failsafe should those pins get overdriven.
11. Initial sense voltage in Boost and Buck-Boost modes at maximum duty cycle.