SELC2010M Просмотр технического описания (PDF) - MagnaChip Semiconductor

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SELC2010M

High current switch mode PWM LED Driver

MagnaChip Semiconductor 

Preliminary – Subject to change without notice

Current Mode Boost switching regulator

operation

The MAP 3201 is operated in current mode PWM Boost regulation

method, which shows fast frequency response while maintaining

stable output voltage.

It features stable response by using the recommended combination

of resistor and capacitor at COMP and GND pin for specific

condition of wide input voltage, Output voltage and variable Load

condition.

When synchronizing multiple MAP3201 on single board, all SYNC

Pin ICs of each device should be short to make all devices in sync

on the Oscillator clock of the fastest device.

In this case, the number of synchronized devices differs depending

on the operation frequency of Oscillator.

If this function of peer to peer synchronization is not used, the SYNC

pin may be required to be open or short to GND. It is recommended

to connect SYNV Pin to GND because this solution provides better

immunity against parasitic noise from layout.

Internal 5V Low Dropout Regulator

The MAP3201 has LDO embedded in it to supply Internal analog,

logic circuit and external REF Pin. This LDO operates at a voltage

level where Vcc is higher than the UVLO voltage. It provides

maximum 10mA of output current through regulator which has 2%

accuracy of performance.

To stabilize the voltage of REF Pin, it is recommended to use low

ESR capacitor which is as low as 1uF and connect it between REF

and GND Pin, and install it as close as to Pin.

Boost Converter Switching Frequency

The MAP3201 can set the switching frequency of Boost converter

by connecting external resistor between RT and GND Pin.

Recommended switching frequency is 100 KHz to 400 KHz.

See Figure 1 for switching frequency adjustment resistor (RT)

Figure 2 Internal OSC & SYNC circuit

SYNC(4v/div)

Boost Drain(100V/div)

VO( AC 1V/div)

Iboost (0.5A/div)

300KHz/5%`

Figure 3 Synchronization by external clock

(Fixed 100 KHz 300 KHz)

Figure 1 Boost switching frequency vs. RT

SYNCHRONIZATION

The MAP3201 can not only operate constant frequency internally,

but also control switching frequency externally by using external

master clock signal through SYNC Pin. The clock signal of SYNC

Pin needs to be faster than internal Oscillator clock to ensure

normal switching operation.

.

OCT.15 2009. Version 0.3

GATE1

CH1 Boost Drain

GATE2

CH2 Boost Drain

GATE3

Figure 4 Peer –to -peer synchronization

(Fixed 100 KHz)

MagnaChip Semiconductor Ltd.

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