Datasheet > ACT4303

ACT4303

更新时间： 2022-04-13 02:36:12

品牌	Logo	应用领域
技领 - ACTIVE-SEMI		转换器传感器
页数	文件大小	规格书
15页	622K
描述
30V/3A Sensorless CC/CV Step-Down DC/DC Converter

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ACT4303 数据手册

ACT4303

Active- Semi

Rev 0, 05-Dec-11

FUNCTIONAL BLOCK DIAGRAM

FUNCTIONAL DESCRIPTION

regulating output voltage to regulating output

current, and the output voltage will drop with

increasing load.

CV/CC Loop Regulation

As seen in Functional Block Diagram, the ACT4303

is a peak current mode pulse width modulation

(PWM) converter with CC and CV control. The

converter operates as follows:

The Oscillator normally switches at 225kHz.

However, if FB voltage is less than 0.6V, then the

switching frequency decreases until it reaches a

typical value of 30kHz at V_FB= 0.15V.

A switching cycle starts when the rising edge of the

Oscillator clock output causes the High-Side Power

Switch to turn on and the Low-Side Power Switch to

turn off. With the SW side of the inductor now

connected to IN, the inductor current ramps up to

store energy in the magnetic field. The inductor

current level is measured by the Current Sense

Amplifier and added to the Oscillator ramp signal. If

the resulting summation is higher than the COMP

voltage, the output of the PWM Comparator goes

high. When this happens or when Oscillator clock

output goes low, the High-Side Power Switch turns

off.

Enable Pin

The ACT4303 has an enable input EN for turning

the IC on or off. The EN pin contains a precision

1.6V comparator with 125mV hysteresis and a 4µA

pull-up current source. The comparator can be used

with a resistor divider from V_INto program a startup

voltage higher than the normal UVLO value. It can

be used with a resistor divider from V_OUTto disable

charging of a deeply discharged battery, or it can be

used with a resistor divider containing a thermistor

to provide

temperature-dependent shutoff

At this point, the SW side of the inductor swings to

a diode voltage below ground, causing the inductor

current to decrease and magnetic energy to be

transferred to output. This state continues until the

cycle starts again. The High-Side Power Switch is

driven by logic using HSB as the positive rail. This

pin is charged to V_SW+ 5V when the Low-Side

Power Switch turns on. The COMP voltage is the

integration of the error between FB input and the

internal 0.808V reference. If FB is lower than the

reference voltage, COMP tends to go higher to

increase current to the output. Output current will

increase until it reaches the CC limit set by the ISET

resistor. At this point, the device will transition from

protection for over temperature battery. The

thermistor should be thermally coupled to the

battery pack for this usage.

If left floating, the EN pin will be pulled up to roughly

5V by the internal 4µA current source. It can be

driven from standard logic signals greater than

1.6V, or driven with open-drain logic to provide

digital on/off control.

Thermal Shutdown

The ACT4303 disables switching when its junction

temperature exceeds 150°C and resumes when the

temperature has dropped by 20°C.

Innovative Power^TM

- 5 -

www.active-semi.com

1 2 3 456 7 8...15

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与ACT4303相关器件

型号	品牌	描述	获取价格	数据表
ACT4303YH-T	ACTIVE-SEMI	30V/3A Sensorless CC/CV Step-Down DC/DC Converter	获取价格
ACT4402	AEROFLEX	ACT4402 SINGLE TRANSCEIVER FOR MIL-STD-1553/1760	获取价格
ACT4402-I	AEROFLEX	ACT4402 SINGLE TRANSCEIVER FOR MIL-STD-1553/1760	获取价格
ACT4404N	AEROFLEX	Single Transceiver for MACAIR (A3818, A4905, A5232, A5690), MIL-STD-1553 & SAE-AS15531	获取价格
ACT4404N_07	AEROFLEX	Single Transceiver for MACAIR (A3818, A4905, A5232, A5690), MIL-STD-1553 & SAE-AS15531	获取价格
ACT4404N-2	AEROFLEX	Single Transceiver for MACAIR (A3818, A4905, A5232, A5690), MIL-STD-1553 & SAE-AS15531	获取价格

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