ZXLD1356 Datasheet, PDF (2/32 Pages) Diodes Incorporated – High accuracy 550mA, 60V LED driver with internal switch

ZXLD1356
Absolute maximum ratings (voltages to GND unless otherwise stated)
Input voltage (V_IN)
I_SENSE voltage (V_SENSE)
LX output voltage (V_LX)
Adjust pin input voltage (V_ADJ)
Switch output current (I_LX)
Power dissipation (P_tot)
(Refer to package thermal de-rating curve on page 26)
-0.3V to +60V (65V for 0.5 sec)
+0.3V to -5V (measured with respect to V_IN)
-0.3V to +60V (65V for 0.5 sec)
-0.3V to +6V
0.65A
SOT23-5; 1W : DFN; 1.8W
Operating temperature (T_OP)
-40 to 125°C
Storage temperature (T_ST)
-55 to 150°C
Junction temperature (T_{j MAX})
150°C
These are stress ratings only. Operation outside the absolute maximum ratings may cause device failure. Operation
at the absolute maximum ratings, for extended periods, may reduce device reliability.
Thermal resistance
TSOT23-5
DFN
Junction to ambient (R_⍜JA)
Junction to board (R_ΨJB)
Junction to case (R_⍜JC)
82°C/W
33°C/W
-
44°C/W
-
14°C/W
Electrical characteristics (test conditions: V_IN=24V, T_amb=25°C unless otherwise stated)^(a)
Symbol Parameter
Conditions
Min. Typ. Max. Unit
V_IN
V_SU
V_SD
I_INQoff
Input voltage
See note^(b)
Internal regulator start-up threshold
Internal regulator shutdown threshold
Quiescent supply current
with output off
ADJ pin grounded
6
60
V
4.85 5.2
V
4.4 4.75
V
65 108 ␮A
I_INQon
Quiescent supply current
with output switching^(c)
ADJ pin floating,
L=68␮H, 3 LEDs,
f = 360kHz
1.6
mA
V_SENSE Mean current sense threshold voltage Measured on I_SENSE pin 195 200 205 mV
(Defines LED current setting accuracy) _{with respect to VIN}
V_ADJ = 1.25V; V_IN=18V
V_SENSEHYS Sense threshold hysteresis
±15
%
I_SENSE
I_SENSE pin input current
V_SENSE = V_IN -0.2
4
10 ␮A
V_REF
Internal reference voltage
Measured on ADJ pin
1.25
V
with pin floating
⌬V_REF /⌬T Temperature coefficient of V_REF
50
ppm/°C
V_ADJ
External control voltage range on ADJ
pin for DC brightness control^(d)
0.3
2.5
V
V_ADJoff
DC voltage on ADJ pin to switch
device from active (on) state to
quiescent (off) state
V_ADJ falling
0.15 0.2 0.27 V
NOTES:
(a) Production testing of the device is performed at 25°C. Functional operation of the device and parameters specified over
a -40°C to +105°C temperature range, are guaranteed by design, characterization and process control.
(b) V_IN > 16V to fully enhance output transistor. Otherwise out current must be derated - see graphs. Operation at low
supply may cause excessive heating due to increased on-resistance. Tested at 7V guaranteed for 6V by design.
(c) Static current of device is approximately 700 ␮A, see Graph, Page 17
(d) 100% brightness corresponds to V_ADJ = V_ADJ(nom) = V_REF. Driving the ADJ pin above V_REF will increase the V_SENSE.
threshold and output current proportionally.
Issue 2 - September 2008
2
© Diodes Incorporated 2008
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