MIC2196YM LED EV Micrel, MIC2196YM LED EV Datasheet

MIC2196YM LED EV

Manufacturer Part Number

MIC2196YM LED EV

Description

Power Management IC Development Tools SO-8 3V Boost Contoller (Lead Free) - Evaluation Board

Manufacturer

Micrel

Type

PWM Controllersr

Datasheet

1.MIC2196YM_LED_EV.pdf (6 pages)

Specifications of MIC2196YM LED EV

Product

Evaluation Boards

Tool Is For Evaluation Of

MIC2196

Input Voltage

10 V to 16 V

Output Voltage

17 V to 30 V

Description/function

Evaluation Board

Maximum Operating Temperature

+ 125 C

Minimum Operating Temperature

- 40 C

Output Current

1 A

For Use With

MIC2196

Current page: 1 of 6
Download datasheet (143Kb)

General Description

The MIC2196 current mode boost controller is used to

implement a LED Driver with PWM DIM control (Figure 1).

The LED series string is pulsed on and off by the PWM

DIM input signal to provide true PWM dimming. When

pulsed on the LED, current is regulated by the high

frequency current mode boost converter. The converter is

designed as a constant current not a constant voltage

output boost converter. The under voltage lockout is used

to prevent operation below about 9.5V. The input of the

converter is 12V nominal and the output can be from 17V

to 30Vdc. The LED current can be set by selecting the

value of R3 (Table 2). The maximum input voltage to the

MIC2196 is 16V. Table 1 provides a summary of the

specifications. The evaluation board schematic is shown in

Figure 1 and the parts list is shown in the Bill of Materials

table.

Specifications

Requirements

1. Voltage source at 3A

2. Pulse generator: TTL output, 100-300 HZ variable duty

3. Load: LED string (series), a resistive or a electronic

Precautions

The evaluation board does not have input reverse polarity

protection. Applying a negative voltage at the V

may damage the board. When the controller is off there is

Output voltage

Output current

Power out

efficiency

Output ripple

Switching Freq

PWM control

PWM Frequency

January 2007

cycle

load (constant resistance mode)

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

Table 1. Design Specifications

16Vdc

30Vdc

1amp

100%

1Vpp

5kHz

30W

Max

400kHz

700mA

12Vdc

22Vdc

300Hz

17W

92%

Typ

10Vdc

17Vdc

Min

0Hz

terminal

a current path through the inductor and through the fly

back diode to the output. No current limit exists for this

current path so care must be taken not to short circuit the

output.

How it works

Switch Q3, turns off and on the current to the load. When

the load current is turned on the boost converter regulates

the load current by keeping the IR drop across

R10+Q3_R

of R10) compared to R10. When the load is off the

converter turns off (FB pin is pulled high by R14). When

the load current is turned off the input is connected to the

output through L1 and D1. For 100% duty cycle, simply

keep PWM DIM high (5V). For a different LED current

change R3 using the following equation. When R3 is 2.15K

the LED current is at 1A.

Where:

408

) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

Boost LED Driver w/PWM DIM Control

2.15k

2.21k

2.26k

2.32k

2.37k

2.43k

2.49k

2.55k

2.61k

(Approximate)

R3 = 2.43k. (used on evaluation board)

R14 = 15k

R10 = 330mΩ

REF

= 7.5V

RDSON

MIC2196 LED Driver

DSON

= 1.245

Evaluation Board

constant. Q3’s R

= 34mΩ

R14

Table 2. R3 Values

I_LED Measured

1.02amps

920mA

860mA

792mA

744mA

700mA

616mA

536mA

490mA

LED

DSON

(R10

is a low (about 1/10

I_LED Calculated

M9999-013107-A

930mA

870mA

810mA

760mA

700mA

640mA

580mA

520mA

RDSON

)

Related parts for MIC2196YM LED EV

MIC2196YM LED EV Summary of contents

Page 1

... The evaluation board does not have input reverse polarity protection. Applying a negative voltage at the V may damage the board. When the controller is off there is Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 ( January 2007 Boost LED Driver w/PWM DIM Control a current path through the inductor and through the fly back diode to the output ...

Page 2

... Micrel, Inc. I_LED vs. R3 1050 1000 950 900 850 800 750 700 650 600 550 500 2.15 2.21 2.26 2.32 2.37 2.43 2.49 2.55 2.61 R3(kohm) Plot 1. I_LED vs R3 January 2007 MIC2196 LED Driver Evaluation Board Quick-Start Guide 1. Connect a load between V string or resistive load) 2. Connect a function generator to the PWM DIM input and GND (not RTN) ...

Page 3

... Micrel, Inc. Bill of Materials Item Part Number TZMC33 Z1 TZS4714 FLZ33VCC BC846A Q1 BC846AMTF SI4484EY Q2 SI4850EY SI3434DV Q3 SI3424DV PDS540 D1 SSC54 L1 CDR7D43MN-4R7NC. C1 594D476X9035D2T GRM32DF51H106ZA01 C2 C3216X7R1H106M. 594D106X9035D2T C4 594D156X9035D2T C5 VJ0805Y102KXAMT C6 VJ0603Y102KXAMT GRM21BR71C105KA01B C3, C7, C9 VJ0805S105KXJAT C8 VJ0603Y101KXAMT LED LEW E3A R1, R17 CRCW06031002FRT1 R2 CRCW08051501FRT1 January 2007 Figure 1. Schematic Diagram ...

Page 4

... CRCW06031003FRT1 R16 CRCW06031961FRT1 Z2 LM4041CYM3-ADJ IC1 MIC2196YM Notes: 1. Vishay: www.vishay.com 2. Fairchild Semiconductor: www.fairchildsemi.com 3. Diodes, Inc.: www.diodes.com 4. Sumida: www.sumida.com 5. Murata:: www.murata.com 6. TDK: www.tdk.com 7. Osram: osram.com 8. Micrel, Inc.: www.micrel.com January 2007 Manufacturer (1) Vishay Dale (1) Vishay Dale (1) Vishay Dale (1) Vishay Dale (1) Vishay Dale (1) Vishay Dale ...

Page 5

... Micrel, Inc. PCB Layout January 2007 MIC2196 LED Driver Evaluation Board Top Layer Bottom Layer 5 M9999-013107-A ...

Page 6

... A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully January 2007 indemnify Micrel for any damages resulting from such use or sale ...

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