Diodes ZXLD1374 - Manual (Page 5)

ZXLD1374
Document number: DS35032 Rev. 3 - 2
5 of 39
www.diodes.com
September 2012
© Diodes Incorporated
ZXLD1374
A Product Line of
Diodes Incorporated
Recommended Operating Conditions
(@T
A
= +25°C, unless otherwise specified.)
Symbol Parameter Performance/Comment Min Max Unit
V
IN
Input Supply Voltage Range
Normal operation 8
60 V
Reduced performance operation (Note 7) 6.3
V
AUX
Auxiliary Supply Voltage Range (Note 8)
Normal operation 8
60 V
Reduced performance operation (Note 7) 6.3
V
SENSE
Differential Input Voltage V
VIN
-V
ISM
, with 0 ≤ V
ADJ
≤ 2.5 0 450 mV
V
LX
Low Side Switch Output Voltage 60 V
I
LX
Low Side Switch Continuous Output Current 1.5 A
V
ADJ
External DC Control Voltage Applied to ADJ Pin to
Adjust Output Current DC brightness control mode
from 10% to 200%
0.125 2.5 V
I
STATUS
Status Pin Output Current 100 µA
I
REF
Reference External Load Current REF sourcing current 1 mA
f
SW
Recommended Switching Frequency Range (Note 9) 300 1000 kHz
V
TADJ
Temperature Adjustment (T
ADJ
) Input Voltage Range 0 V
REF
V
f
PWM
Recommended PWM Dimming Frequency Range
To maintain 1000:1 resolution 100 500 Hz
To maintain 200:1 resolution 100 1000 Hz
t
PWMH/L
PWM Pulse Width in Dimming Mode PWM input high or low 0.005 10 ms
V
PWMH
PWM Pin High Level Input Voltage 2 5.5 V
V
PWML
PWM Pin Low Level Input Voltage 0 0.4 V
T
J
Operating Junction Temperature Range -40 +125 °C
GI Gain Setting Ratio for Boost and Buck-Boost Modes Ratio= V
GI
/V
ADJ
0.20 0.50
Notes: 7. Device is guaranteed to have started up by 6.5V and as such the minimum applied supply voltage has to be above 6.5V (plus any noise margin).
The ZXLD1374 will, however, continue to function when the input voltage is reduced from ≥ 8V down to 6.3V.
When operating with input voltages below 8V the output current and device parameters may deviate from their normal values; and is dependent on
power MOSFET switch, load and ambient temperature conditions. To ensure best operation in Boost and Buck-boost modes with input voltages, V
IN
,
between 6.5 and 12V a suitable boot-strap network on V
AUX
pin is recommended. Performance in Buck mode will be reduced at input voltages (V
IN
,
V
AUX
) below 8V. – A boot-strap network cannot be implemented in buck mode.
8. V
AUX
can be driven from a voltage higher than V
IN
to provide higher efficiency at low V
IN
voltages, but to avoid false operation; a voltage should not
be applied to V
AUX
in the absence of a voltage at V
IN
.
9. The device contains circuitry to control the switching frequency to approximately 400kHz. The maximum and minimum operating frequency is not
tested.