ZXLD1350ET5 Diodes Inc, ZXLD1350ET5 Datasheet - Page 17

• Manufacturer Part Number: ZXLD1350ET5
• Description: IC, LED DRIVER, BUCK, TSOT-23-5
• Manufacturer: Diodes Inc

Specifications of ZXLD1350ET5

• Led Driver Application: Automotive Lighting, Illuminated Signs
• No. Of Outputs: 1
• Output Current: 350mA
• Output Voltage: 30V
• Input Voltage: 7V To 30V
• Dimming Control Type: PWM / DC
• Topology: Buck
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ZXLD1350
Document number: DS33468 Rev. 8 - 2
Application Information (Continued)
Inductor Selection
Recommended inductor values for the ZXLD1350 are in the range 47µH to 220µH.
Higher values of inductance are recommended at higher supply voltages in order to minimize errors due to switching delays,
which result in increased ripple and lower efficiency. Higher values of inductance also result in a smaller change in output
current over the supply voltage range. (See graphs). The inductor should be mounted as close to the device as possible with
low resistance connections to the LX and V
The chosen coil should have a saturation current higher than the peak output current and a continuous
current rating above the required mean output current.
Suitable coils for use with the ZXLD1350 are listed in the table below:
The inductor value should be chosen to maintain operating duty cycle and switch 'on'/'off' times within the specified limits over
the supply voltage and load current range.
The following equations can be used as a guide, with reference to Figure 1 - Operating waveforms.
LX Switch 'On' time
Note: t
LX Switch 'Off' time
Note: t
Where:
t
t
ON
OFF
NP04SB470M
MSS6132ML
CD104-MC
DO1608C
Part No.
=
=
V
ONnmin
OFFmin
V
L is the coil inductance (H)
r
I
ΔI is the coil peak-peak ripple current (A) {Internally set to 0.3 x I
V
V
R
V
IN
avg
L
LED
IN
LED
LX
D
is the coil resistance (Ω)
−
is the rectifier diode forward voltage at the required load current (V)
is the supply voltage (V)
is the required LED current (A)
V
is the switch resistance (Ω)
+
is the total LED forward voltage (V)
LED
> 200ns
> 200ns
V
D
−
+
L
I
(µH)
avg
I
100
220
Δ
avg
47
47
68
47
L
L
I
Δ
×
×
I
(
R
(
R
S
S
DCR
+
0.64
0.55
0.27
0.38
0.58
0.82
+
(V)
r
r
L
L
+
)
R
LX
)
0.56
0.47
0.39
0.53
0.38
I
(A)
0.5
SAT
IN
pins.
Manufacturer
Taiyo Yuden
CoilCraft
www.diodes.com
Sumida
17 of 22
30V 350mA LED DRIVER with AEC-Q100
avg
}
Diodes Incorporated
A Product Line of
© Diodes Incorporated
ZXLD1350
March 2011