ZXLD1370EST16TC Diodes Zetex, ZXLD1370EST16TC Datasheet - Page 18

• Manufacturer Part Number: ZXLD1370EST16TC
• Description: IC LED DRVR HIGH BRIGHT TSSOP-16
• Manufacturer: Diodes Zetex
• Type: HBLED Driverr

Specifications of ZXLD1370EST16TC

• Constant Current: *
• Constant Voltage: *
• Topology: *
• Number Of Outputs: *
• Internal Driver: *
• Type - Primary: *
• Type - Secondary: *
• Frequency: *
• Voltage - Supply: *
• Voltage - Output: *
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP Exposed Pad, 16-eTSSOP, 16-HTSSOP
• Operating Temperature: *
• Current - Output / Channel: *
• Internal Switch(s): No
• Efficiency: 95%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ZXLD1370EST16TCTR

ZXLD1370
Document number: DS32165 Rev. 4 - 2
Applications Information
For example, in a Buck-bust configuration (VIN =10-18V and 4 LEDs), with a load current of 350mA; if the target frequency
is around 400kHz, the Ideal inductor size is L= 33uH. The same size of inductor can be used if the target frequency is higher
than 500kHz driving 6LEDs with a current of 350mA from a VIN =12-24V.
In the case of the Boost topology, the following graphs guide the designer to select the inductor for a target frequency of
400kHz (figure 25) or higher than 500kHz (figure 26).
15
13
11
9
7
5
3
1
Figure 24. 350mA Buck-Boost mode inductor selection for target frequency > 500kHz
15
13
11
0
9
7
5
3
1
0
Figure 25. 350mA Boost mode inductor selection for target frequency 400kHz
L=22µH
L=22µH
10
10
(Continued)
ZXLD1370 Buck-Boost Mode 350mA Minimum Recommended Inductor
ZXLD1370 Boost Mode 350mA Minimum Recommended Inductor
L=33µH
L=33µH
20
20
Target Switching Frequency - 400kHz
Target Switching Frequency > 500kHz
L=47µH
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Supply Voltage (V)
Supply Voltage (V)
18 of 36
L=47µH
30
30
40
40
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A Product Line of
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50
60
© Diodes Incorporated
ZXLD1370
60
March 2011