NCP5612 데이터 시트보기 (PDF) - ON Semiconductor

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NCP5612

High Efficiency Ultra Small Thinnest White LED Driver

ON Semiconductor 

NCP5612

PIN FUNCTION DESCRIPTION

Pin No.

Symbol

Function

Description

1

GND

POWER

This pin is the GROUND signal for the power analog blocks and must be

connected to the system ground. This pin is the GROUND reference for the

DC/DC converter and the output current control. The pin must be connected to

the system ground, a ground plane being strongly recommended.

2

LED1

INPUT, POWER

This pin sinks to ground and monitors the current flowing into the first LED,

intended to be used in backlight application. The current is limited to 30 mA

maximum (Note 2).

The LED1 is deactivated when the ICON bit of the LED−REG register is High.

The LED1 is automatically disconnected when an open load is sensed pin 2

during the operation.

3

LED2

INPUT, POWER

This pin sinks to ground and monitors the current flowing into the second LED,

intended to be used in backlight application. The current is limited to 30 mA

maximum (Note 2). The LED2 fulfills the ICON function, LED1 being

deactivated, when the ICON bit of the LED−REG register is High.

The LED2 is automatically disconnected when an open load is sensed pin 3

during the operation.

4

IREF

INPUT, ANALOG

This pin provides the reference current, based on the internal band−gap

voltage reference, to control the output current flowing in the LED. A 1%

tolerance, or better, resistor shall be used to get the highest accuracy of the

LED biases. An external current source can be used to bias this pin to dim the

light coming out of the LED.

In no case shall the voltage at pin 4 be forced either higher or lower than the

600 mV provided by the internal reference.

5

CNTL

INPUT, DIGITAL

This pin supports the flow of data between the external MCU and the

NCP5612 internal registers. The protocol makes profit of a Single Wire

structure associated to a Serial 8 bits format data flow.

6

NC

−

No internal connection

7

VOUT

OUTPUT, POWER

This pin provides the output voltage supplied by the DC/DC converter. The

Vout pin must be decoupled to ground by a 1 mF ceramic capacitor located as

close as possible to the pin. Cares must be observed to minimize the parasitic

inductance at this pin. The circuit shall not operate without such bypass

capacitor connected across the Vout pin and ground.

The output voltage is internally clamped to 5.5 V maximum in the event of no

load situation. On the other hand, the output current is limited to 40 mA

(typical) in the event of a short circuit to ground.

8

C2P

POWER

One side of the external charge pump capacitor (CFLY) is connected to this

pin, associated with C2N (Note 1)

9

C2N

POWER

One side of the external charge pump capacitor (CFLY) is connected to this

pin, associated with C2P (Note 1)

10

C1P

POWER

One side of the external charge pump capacitor (CFLY) is connected to this

pin, associated with C1N (Note 1)

11

VBAT

INPUT, POWER

Input Battery voltage to supply the analog and digital blocks. The pin must be

decoupled to ground by a 1.0 mF minimum ceramic capacitor.

12

C1N

POWER

One side of the external charge pump capacitor (CFLY) is connected to this

pin, associated with C1P (Note 1)

1. Using low ESR ceramic capacitor, 50 mW maximum, is mandatory to optimize the Charge Pump efficiency.

2. Total DC/DC output current is limited to 60 mA.

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