Datasheet > IK2306

IK2306

更新时间： 2025-07-16 20:01:15

品牌	Logo	应用领域
IKSEMICON		/
页数	文件大小	规格书
7页	221K
描述
Application : LED Lighting; Status : Under development; Function : 60mA Switch-Mode LED Driver; Package : SOT-89;

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IK2306 数据手册

IK2306

FUNCTIONAL DESCRIPTION

The IK2306 is PWM peak current controllers or controlling a buck converter topology in

continuous conduction mode (CCM). The output current is internally preset at 50mA. When the

input voltage of 20 to 400V appears at the DRAIN pin, the internal high-voltage linear regulator

seeks to maintain a voltage of 7VDC at the VDD pin. Until this voltage exceeds the internally

programmed under-voltage threshold, the output DRAIN is non-conductive. When the threshold is

exceeded, the DRAIN turns on. The input current begins to flow into the DRAIN pin. Hysteresis is

provided in the under-voltage comparator to prevent oscillation. When the input current exceeds

the internal preset level, a current sense comparator resets an RS flip-fl op, and the DRAIN turns

off. At the same time, a one-shot circuit is activated that determines the duration of the off-state

(10 µs typ.). As soon as this time is over, the flip-fl op sets again. The new switching cycle begins.

A “blanking” delay of 300ns is provided that prevents false triggering of the current sense

comparator due to the leading edge spike caused by circuit parasitics.

TYPICAL APPLICATION DIAGRAM

Figure

Selecting L and D

There is a certain trade-off to be considered between optimal sizing of the output inductor L and

the tolerated output current ripple. The required value of L is inversely proportional to the ripple

current dI_Oin it.

T_{OFF _ MIAX}*V_O

L 

(1)

dI_O

V_Ois the forward voltage of the LED string. T_OFFis the off time of the IK2306. The output current in

the LED string (I ) is calculated then as:

I_O I_TH dI_O

(2)

2013 January, Ver. 00

1 2 345 6 7

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