Datasheet > RT8820A

RT8820A

更新时间： 2024-04-09 19:03:02

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
21页	355K
描述
Dual-Phase PWM Controller with PWM-VID Reference

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RT8820A 数据手册

RT8820A

Electrical Characteristics

(V_PVCC= 5V, typical values are referenced to T_A= T_J= 25°C, Min and Max values are referenced to T_A= T_Jfrom −10°C to

105°C, unless other noted)

Parameter

PWM Controller

Symbol

Test Conditions

Min

Typ

Max

Unit

PVCC Supply Voltage

V_PVCC

I_SUPPLY

I_SHDN

4.5

5.5

V_EN= 3.3V, 1phase DEM mode,

not switching, VREF external R =

40k

PVCC Supply Current

0.4

PVCC Shutdown Current

PVCC POR Threshold

POR Hysteresis

V_EN= 0V

3.8

4.4

A

4.1

0.3

300

Switching Frequency

Minimum On-Time

Minimum Off-Time

EN Input Voltage

f_SW

R_TON= 500k (Note 5)

270

330

kHz

t_ON(MIN)

t_OFF(MIN)

300

Logic-High V_{EN_H}

1.2

5.5

EN Input Voltage

Logic-Low V_{EN_L}

0.55

Mode Decision

2 Phase CCM

2 Phase DEM

1 Phase CCM

1 Phase DEM

V_PSI

1.6

1.08

0.7

1.8

1.2

0.8

5.5

1.35

0.88

0.4

PWM-VID Input Voltage for 1.8V GPIO Setting

Logic H

V_{PWM-VID_H}

V_{PWM-VID_L}

1.2

Logic L

0.6

Protection Function

Zero Current Crossing

Threshold

8

A

Current Limit Setting Current I_OCSET

Current Limit Setting Current

T_A= T_J= 25C

I_{OCSET_TC}

4700

ppm/C

Temperature Coefficient

Current Limit Threshold

R_OCSET= 120k

100

Absolute Over-Voltage

Protection Threshold

Relative Over-Voltage

Protection Threshold

V_OVP,AbsoluteV_REFIN 1.33V

1.9

2.1

V_{OVP, Relative}V_REFIN> 1.33V

145

150

155

OV Fault Delay

FB forced above OV threshold

UVP

FB forced above UV threshold

s

Relative Under-Voltage

Protection Threshold

V_UVP

s

C

UV Fault Delay

Thermal Shutdown

Threshold

T_SD

150

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

DS8820A-01 February 2020

1...3 4 567 8 9...21

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