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MAX16814 Evaluation Kit

Evaluates: MAX16814

General Description

The MAX16814 evaluation kit (EV kit) demonstrates

the MAX16814 high-brightness LED (HB LED) driver,

integrating a step-up DC-DC preregulator followed by 4

channels of linear current sinks. The step-up preregula-

tor switches at 350kHz and operates as a current-mode-

controlled regulator capable of providing up to 600mA

for the linear circuits. Each of the 4 linear channels can

operate up to 40V and provide up to 150mA per channel.

The 4 channels are configurable for 100mA or 150mA

HB LED output current. The IC is a 20-pin TSSOP pack-

age with an exposed pad for enhanced thermal power

dissipation.

The EV kit operates from a DC supply voltage of 6.5V

up to the HB LED string forward voltage. The EV kit can

withstand a 40V load-dump condition. The EV kit also

demonstrates the IC features such as adaptive voltage

optimization, undervoltage lockout (UVLO), overvoltage

protection (OVP), cycle-by-cycle current limit, thermal

shutdown, and digital PWM dimming operation using a

digital PWM input signal to control the brightness of the

HB LEDs. The EV kit also demonstrates a reference IC

design for automotive applications.

Features

S Input Voltage from 6.5V Up to HB LED Forward

Voltage

S Demonstrates OVP (33V)

S HB LED String Output Currents Configurable for

100mA or 150mA

S Demonstrates UVLO (5V)

S Demonstrates Open and Short LED Fault

Protection and Detection

S Demonstrates Cycle-by-Cycle Current Limit and

Thermal-Shutdown Features

S Demonstrates Adaptive Voltage Optimization

S Proven PCB and Thermal Design

S Fully Assembled and Tested

Component List

19-4947; Rev 1; 5/10

Ordering Information

+Denotes lead(Pb)-free and RoHS compliant.

PART TYPE

MAX16814EVKIT+ EV Kit

DESIGNATION QTY DESCRIPTION

C1 1

10FF, 50V electrolytic capacitor

(6.3mm x 6mm case)

SANYO 50CE10KX

C2 1

47FF, 50V electrolytic capacitor

(6.3mm x 7.7mm case)

SANYO 50CE47KX

C3, C4, C7,

C12

1FF Q10%, 50V X7R ceramic

capacitors (0805)

Murata GRM21BR71H105K

C5 1

33FF, 50V electrolytic capacitor

(6.3mm x 7.7mm case)

SANYO 50CE33KX

C6 0

Not installed, electrolytic capaci-

tor (6.3mm x 7.7mm case)

C8, C13–C16 0

Not installed, ceramic capacitors

(0603)

C9 1

1000pF Q5%, 25V C0G ceramic

capacitor (0603)

Murata GRM1885C1E102J

DESIGNATION QTY DESCRIPTION

C10 1

0.022FF Q5%, 50V X7R ceramic

capacitor (0603)

Murata GRM188R71H223K

C11 1

0.1FF Q10%, 50V X7R ceramic

capacitor (0805)

Murata GRM21BR71H104K

C17 1

47pF Q5%, 50V C0G ceramic

capacitor (0603)

Murata GRM1885C1H470J

C18–C21 4

2200pF Q5%, 50V C0G ceramic

capacitors (0603)

Murata GRM1885C1H222J

D1 1

60V, 1A Schottky diode (SMB)

Diodes, Inc. B160B-13-F

D2 1

75V, 250mA high-speed diode

(SOT23)

Central Semi CMPD914E

(Top Mark: C5DE)

Summary of content (12 pages)

PAGE 1
9-4947; Rev 1; 5/10 MAX16814 Evaluation Kit The MAX16814 evaluation kit (EV kit) demonstrates the MAX16814 high-brightness LED (HB LED) driver, integrating a step-up DC-DC preregulator followed by 4 channels of linear current sinks. The step-up preregulator switches at 350kHz and operates as a current-modecontrolled regulator capable of providing up to 600mA for the linear circuits. Each of the 4 linear channels can operate up to 40V and provide up to 150mA per channel.
PAGE 2
Evaluates: MAX16814 MAX16814 Evaluation Kit Component List (continued) DESIGNATION QTY DESIGNATION QTY JU1, JU3–JU11 10 2-pin headers R8, R9 2 10kI Q5% resistors (0805) JU2 1 3-pin header R10, R16 2 30.1kI Q1% resistors (0805) 1 20kI Q1% resistor (0805) L1 L2 N1 DESCRIPTION DESCRIPTION 1 10FH Q20%, 3A inductor Coilcraft MSS1048-103ML R11 R12 1 200I Q1% resistor (0603) 1 22FH Q20%, 5A inductor Coilcraft MSS1260-223Ml R13 1 21kI Q1% resistor (0603) R14 1 4.
PAGE 3
MAX16814 Evaluation Kit Detailed Description of Hardware Required Equipment The MAX16814 EV kit demonstrates the MAX16814 HB LED driver with an integrated step-up DC-DC preregulator followed by 4 channels of linear current sinks. The preregulator switches at 350kHz and operates as a current-mode-controlled regulator providing up to 600mA for the linear circuit while providing OVP. Cycle-by-cycle current limit is set by resistor R4 and resistors R6 and R7 set the OVP voltage to 33V.
PAGE 4
Evaluates: MAX16814 MAX16814 Evaluation Kit using the SYNC PCB pad and an external AC clock signal. Test points are provided for easy access to IC’s VCC and SGND. Enable and UVLO The EV kit features two jumpers to enable/disable U1 and configure the UVLO. Jumper JU1 enables the EV kit when a shunt is installed and a shunt is also installed on pins 1-2 of jumper JU2. Removing jumper JU1 disables the EV kit.
PAGE 5
MAX16814 Evaluation Kit HB LED Digital-Dimming Control The EV kit features a DIM PCB input pad for connecting an external digital PWM signal. The DIM PCB pad is pulled up to VCC by resistor R8. Apply a digital PWM signal with a 0.8V logic-low (or less) and a 2.1V logichigh (or greater) level, and frequencies from 100Hz to 20kHz. To adjust the HB LED brightness, vary the signal duty cycle from 0 to 100% and maintain a minimum pulse width of 1Fs. Apply the digital PWM signal to the DIM and SGND PCB pads.
PAGE 6
Evaluates: MAX16814 MAX16814 Evaluation Kit Figure 1.
PAGE 7
MAX16814 Evaluation Kit Evaluates: MAX16814 1.0” Figure 2.
PAGE 8
Evaluates: MAX16814 MAX16814 Evaluation Kit 1.0” Figure 3.
PAGE 9
MAX16814 Evaluation Kit Evaluates: MAX16814 1.0” Figure 4.
PAGE 10
Evaluates: MAX16814 MAX16814 Evaluation Kit 1.0” Figure 5.
PAGE 11
MAX16814 Evaluation Kit Evaluates: MAX16814 1.0” Figure 6.
PAGE 12
MAX16814 Evaluation Kit Evaluates: MAX16814 Revision History REVISION_ NUMBER REVISION_ DATE 0 9/09 Initial release 1 5/10 Updated R12 in Component List and Figure 1 DESCRIPTION PAGES_ CHANGED — 2, 6 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.