RS2201,RS2201 pdf中文资料,RS2201引脚图,RS2201电路-Datasheet-电子工程世界

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RS2201

Switching Power Supply Controller

Description

RS2201, produced by advanced integrated circuit process, is a switch power supply controller, which could offer over-load and

saturation protection, and achieve green economize on energy and environmental protection standard. RS2201 could achieve

AC/DC conversion and can be widely applied to economical switching power supply equipment. For instance, Charger、DVD,

Induction cooker, STB, Printer, LCD and so on.

Features

Over-load and saturation protection could protect over-load, switch transformer saturation and output short circuit or the

relative failures.

It is economical that triode is used for switch device, which could start up the circuit with its amplification function and

reduce ten times of power consumption of the start-up resistance.

Built-in Synchronized Slope Compensation circuit, thermal protection circuit, slope current drive circuit.

Zero-load output power consumption could be less than 0.3W, is less than 0.2W while 220V AC input.

Pin to Pin THX201

Pb-Free DIP-8 and SOP-8 Package.

Applications

Switching AC/DC Adaptor

Battery Charger

Open Frame Switching Power Supply

Standby Power Supplies

Set-Top Box Power Supplies

384X Replacement

Pin Configurations

Name

CT

VR

FB

GND

IS

OE

OB

VCC

Description

By connecting a cap to ground to set the switching frequency

2.5V reference voltage output

Feedback pin

GND

Current sense.

Power Transistor Emitter drive output and start-up current input.

Power Transistor Base drive output and start-up current control.

Power Supply.

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Nov, 2007

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Typical Application Circuit

Operation description

Initially, after power up, no output of VR. FB pull-up current source is turn off. OE inputs start-up current from power

transistor to VCC. OB controls the base current of power transistor and limits the collector current (start-up accept current

of RS2201) of power transistor so to safeguard the power transistor. When the VCC voltage rises to 7.8V, the start-up

phase completes and goes to the normal operation.

In normal operation, VCC voltage must keep 4.75~9.8V, VR outputs 2.5V reference voltage. FB pull-up current source

turns on. Oscillator outputs OSC1 to decide the maximum duty cycle and OSC2 to trigger power supply entering the open

cycle and cover spike value of power transistor start-up current. If FB is less than 1.8V(about 1.2-1.8V), the less the FB is,

the wider the oscillation cycle is.（This characteristics reduces the standby consumption of the switching power supply）.

If external feedback intends to get VCC greater than 9.8V, the internal feedback circuit regular VCC on 9.8V.（Making use

of this characteristics to stable output voltage no using external feedback circuit, but the regulating is not precise）.

In open cycle, OB provides the base current for power transistor, OE pulls down the emitter of power transistor to IS and

OB adopts slop current drive (OB open current is IS function, when IS=0V,OB open current is about 40mA, and OB open

current is increasing with IS linear increasing. When IS increases 0.6V, OB open current is about 120mA. This

characteristics makes use of output current of OB effectively and reduces power consumption of RS2201). If IS detects the

FB designated current, it enters closed cycle. In closed cycle, OB pulls down, the power transistor is not be turn off

immediately but OE clamps 1.5V (after power transistor is turn off, the base is reverse bias, the breakdown voltage of

power transistor is improved). In the open or closed cycle, if power transistor is detected to exceed upper limit current, the

upper limit current trigger will set firstly and forces FB to pull down, duty cycle reduced, so to protect power transistor and

transformer. In the next closed cycle start-up time, or when FB is less than 1.8V, upper current trigger resets. In addition,

RS2201 is built in thermal protection, when the internal temperature is above 140

℃

, it will widen the cycle of oscillator, so

that the temperature of RS2201 will not exceed 150

℃

. Slop compensation is built in to stabilization open/closed cycle

during the maximum duty cycle or the continual current mode of RS2201.

If VCC reduces to 4.4V, oscillator is turn off, OSC1 OSC2 low level, power supply keeps closed cycle. when VCC

continually reduces to about 4.0 V , RS2201 enters start-up phase again.

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Fig.1 OPEN/CLOSED CYCLE WAVES IN NORMAL OPERATION

Electrical parameter definition

Start-up accept current: OE node current when OB has a 0.1mA pull-down current in start-up phase.

Start-up static current: VCC connects to filter capacitor and adjustable current source, CT connects to 680PF，other pins

are floating. It is the minimum current that could oscillate the VCC.

Start-up voltage: The max. value of VCC oscillation above.

Restart voltage: The min. value of VCC oscillation above.

Voltage of Oscillator is turn off: VCC value, which stops the oscillator in falling time of VCC oscillation above.

Static current: In normal operation, FB connects to the grand through 1.8K resistor. VCC power supply current.

The pull-up/ pull-down current of oscillator: In normal operation, FB=2.5V,CT=1.25V, pull-up /pull-down current on CT.

Fig.2 RS2201 ALL SIGNAL WAVES

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FB pull-up current: In normal operation, when FB=2.5V,IS=0V, pull up current on FB.

FB protecting upper limit current: In normal operation, FB=2.5V,IS=0.8V，pull down current on FB.

Internal feedback power supply voltage: In normal operation, VCC value of RS2201 power supply without external standby

feedback circuit.

IS upper limit current: FB=2.5V，external adjustable power supply to IS, there is minimal IS voltage of pull-down current on

FB.

Slope current drive: OB open current is IS function, when IS=0V,OB open current is about 40mA, and OB open current is

increasing with IS linear increasing. When IS increases 0.6V, OB open current is about 120mA.

OSC Frequency

: C function of CT pin external capacitor, is about C*24000 seconds.

Electrical Characteristics

Symbol

Ics

Parameter

Start-up accept current

Start-up static current

Start-up voltage

Oscillator cut off voltage

Restart voltage

Inner oscillator voltage

Operating Current

VR reference voltage

Oscillator Frequency

Oscillator pull-up current

Oscillator pull-down current

Maximum Duty Cycle

FB Feedback Voltage

FB pull-up current

FB prevent upper limit current

IS upper limit current

OE Clamp Voltage

OB open current

OB closed current

OE output current

Conditions

Min.

1.6

7.6

4.25

9.6

VCC=8V

2.4

CT*24000

CT=1.25V

CT=680PF

IS=0.5V,CT=0.6V

FB=2.5V,IS=0V

FB=2.5V,IS=0.8V

R IS-GND =0.75Ω

OE=0.001~1.2A

IS=0.5V

IS=0.0V

OB-IS=1V

OB-IS=0.25V

OE-IS=0.6V

Typ.

2.0

55

7.8

4.50

4.0

10.0

3.5

2.5

64

100

1.9

55

4.8

590

310

0.60

1.6

120

44

-210

-4.5

-1.2

Max.

2.4

80

8.0

4.75

10.4

2.6

Unit

mA

uA

V

mA

V

KHz

uA

mA

%

V

uA

V

mA

A

Icc

VR

Fosc

53

61

0.54

102

32

-145

0.62

140

60

-230

-6

-1

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RS2201 - 12W（12V/1A）Demo Board Circuit Diagram

BOM List

Part Location

R1

R2

R3

R4, R5

R6

R7, R10

R8

R9

R11

R12

C1, C2

C3

C4

C5

C6

C7

C8

C9,C10

CX1

CY1

B1

D1;D2

D3

D4

F1

L1

LF1

Q1

T1

LED1

U1

U2

U3

Description

RES;SMD;1206;+/-5%

RES;SMD;0805;+/-5%

RES;SMD;1206;+/-5%

RES;SMD;0805;+/-5%

RES;SMD;0805;+/-3%

RES;MOF;+/-5%,1W

C/E;Ф10*15;105

℃

;+/-20%;KMG

C/C;DIP;+/-10%;Pintch=200mil

C/E;Ф5*11;105

℃

;+/-20%

C/C;DIP;+/-10%;Pintch=200mil

C/C;SMD;+/-10%;0805

C/E;Ф8*12;105

℃

;+/-20%;Pintch=150mil

C/X1;+/-20%;275V;Pintch=400mil;DAIN

C/Y1;+/-20%;Pintch=400mil;

BRIGE; SMD;1A

DIODE; 3A;100V;

DO-201AD

DIODE; 1A;1000V;Fast Recovery;SMA-214

DIODE;1A;100V;DO-35

FUSE,T2AL/250V;4.5*14.5L;Glass

Ф7*10;

1 A

FILTER;UU9.8

1.5A;TRANSISTOR;Vcev≥700V HFE=20;+/-10%;TO225A

TRANSFORMER;

GREEN;Ф3

DIP8

DIP

SOT23-3

Value

2.2M

100K

4.7Ω

47Ω

1K

3.3K

10K

39K

1Ω

10uF/400V

222/1KV

47uF/25V

102/100V

681/25V

104/25V

103/25V

470uF/16V

104/275Vac

222M/400V

1A/600V

SR3100

FR107

1N4148

FUSE

10uH

20mH

MJE13003

EI-22

GREEN

RS2201

PC817

TL431

QTÝ

1

2

1

2

1

2

1

2

1

UNIT

PCS

DS-RS2201-01

Nov, 2007

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RS2201

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