SDC4563_技术文档

Datasheet

Current Mode PWM Controller

General Description

SDC4563

Features

SDC4563 is a highly integrated current mode PWM control

IC optimized for high performance, low standby power

and cost effective offline flyback converter applications in

sub 30W range.



Frequency shuffling technology for improved EMI

performance



Audio noise free operation

Extended burst mode control for improved efficiency

and minimum standby power design

External programmable PWM switching

Internal synchronized slope compensation

Low VDD startup current and low operating current

(1.4mA)

The internal slope compensation improves system large

signal stability and reduces the possible subharmonic

oscillation at high PWM duty cycle output. Leading-edge

blanking on current sense(CS) input removes the signal

glitch due to snubber circuit diode reverse recovery and

thus greatly reduces the external component count and

system cost in the design.



Leading edge blanking on current sense input

Good protection coverage with auto self-recovery

(UVLO/OVP/OCP/OLP)

SDC4563 offers complete protection coverage with

automatic self-recovery feature including cycle-by-cycle

current limiting (OCP), over load protection (OLP), VDD

over voltage clamp and under voltage lockout (UVLO). The

Gate-drive output is clamped to maximum 18V to protect

the power MOSFET.



Package: SOT-23-6

Applications



Battery charger

Power adapter

Set-top box power supplies

SOT-23-6

Figure 1. Package Type

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Datasheet

Current Mode PWM Controller

Pin Configuration

SDC4563

Package: SOT-23-6

1

2

3

6

GND

GATE

VDD

FB

RI

5

4

SENSE

Figure 2. Pin Configuration

Pin Number

Pin Name

Function

1

GND

Ground

Feedback input pin. The PWM duty cycle is determined by voltage level into this

pin and SENSE pin input

2

3

FB

RI

Internal Oscillator frequency setting pin. A resistor connected between RI and

GND set the PWM frequency

4

5

6

SENSE

VDD

Current sense input pin. Connected to MOSFET current sensing resistor node

Chip DC power supply pin

GATE

Totem-pole gate drive output for the power MOSFET

Table 1. Pin Description

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Datasheet

Current Mode PWM Controller

SDC4563

Functional Block Diagram

RI

Current

Reference

Soft

GATE

Drive

SET

CLR

S

Q

Shuffling

OSC

VDD

POR

UVLO

VDD

R

Burst

Mode controller

Clamping

V_{TH_OC}

Leading

Edge

SENSE

FB

Blanking

Internal

Supply

Regulator

OVP

Slope

Compensation

OLP

GND

Figure 3. Functional Block Diagram

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Datasheet

Current Mode PWM Controller

Ordering Information

SDC4563

-

X

SDC4563 X

X

E1: Pb-free

G1: Halogen-free

Circuit Type

Package

SOT-23-6: J

TR: Tape Reel

Part Number

Halogen-free

SDC4563JTR-G1

Marking ID

Temperature

Packing

Type

Package

Range

Pb-free

Halogen-free

SOT-23-6

-40°C~85°C

SDC4563JTR-E1

4563

4563G

Tape Reel

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Datasheet

Current Mode PWM Controller

SDC4563

Absolute Maximum Ratings (NOTE: Stresses greater than those listed under Absolute Maximum Ratings may cause

permanent damage to the device.)

Parameter

Symbol

V_DD

Vaule

-0.3~30

34

Unit

V

DC supply voltage

VDD clamp voltage

VDD clamp current

VFB input voltage

SENSE input voltage

Input voltage to RI pin

V_{DD_CLAMP}

I_CLAMP

V_FB

V

10

mA

V

-0.3~7

150

V_SENSE

V_RI

V

Operating junction temperature

Storage temperature

T_J

°C

mA

V

T_STG

-55~150

200

Latch-up test per JEDEC 78

-

ESD,HBM model per Mil-Std-883H,Method 3015

ESD,MM model per JEDEC EIA/JESD22-A115

HBM

MM

2000

200

V

Table 2. Absolute Maximum Ratings

Recommended Operating Conditions

Parameter

Symbol

V_DD

Min

10

Max

Unit

DC supply voltage

30

70

85

V

Normal oscillation frequency

Operating Temperature Range

f_OSC

60

kHz

°C

T_OP

-40

Table 3. Recommended Operating Conditions

December, 2013 Rev. 1.1

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Datasheet

Current Mode PWM Controller

SDC4563

Electrical Characteristics (Ta=25°C, unless otherwise specified)

Parameter

Symbol

Conditions

Supply Voltage (VDD)

V_DD=12.5V, RI=100k

Min

Typ Max

Unit

VDD start up current

Operation current

I_START

I_DD

-

3

20

-

uA

V_DD=16V, RI=100k, V_FB=3V

1.4

mA

VDD under voltage lockout

(enter)

V_UVLO(ON)

-

7.8

8.8

9.8

V

VDD under voltage lockout (exit)

VDD clamp voltage

V_UVLO(OFF)

V_{DD_CLAMP}

-

13

-

14

34

15

-

V

I_CLAMP=10mA

Feedback Input Section(FB Pin)

△V_FB/△V_CS

PWM input gain

A_VCS

-

2.0

4.8

-

V/V

V

FB open loop voltage

V_{FB_OPEN}

-

Short FB pin to GND and

Measure Current

FB pin short circuit current

Input impedance

I_{FB_SHORT}

Z_FB

-

0.8

6

-

mA

kΩ

V

-

Zero duty cycle FB threshold

voltage

V_{FB_0D}

V_DD=16V, RI=100k

-

0.75

Power limiting fb threshold

voltage

V_{FB_PL}

t_{FB_PL}

-

3.7

35

75

-

V

ms

%

Power limiting debounce time

V_DD=18V, RI=100k,

FB=3V, CS=0

Maximum duty cycle

DC_MAX

Current Sense Input(Sense Pin)

Leading edge blanking time

Input impedance

T_LEB

Z_SENSE

RI=100k

-

300

40

-

ns

kΩ

Over current detection and

control delay

V_DD=16V,

t_{D_OC}

-

75

-

ns

V

CS> V_{TH_OC}, FB=3.3V

Over current threshold voltage at

zero duty cycle

V_{TH_OC}

FB=3.3V, RI=100k

0.70

0.75 0.80

Oscillator

Normal oscillation frequency

Frequency temperature stability

Frequency voltage stability

f_OSC

RI =100K

60

-

65

5

70

-

kHz

%

V_DD=16V, RI=100k,

△f_TEMP

△f_VDD

Ta=-20°C~100°C

V_DD=12V~25V, RI=100k

-

5

-

%

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Datasheet

Current Mode PWM Controller

SDC4563

Parameter

Operating ri range

Symbol

R_RI

Conditions

Min

Typ Max

Unit

kΩ

-

50

-

100

2

150

RI open load voltage

Burst mode base frequency

V_{RI_OPEN}

f_{OSC_BM}

-

V

V_DD=16V, RI =100K

-

22

kHz

Gate Drive Output

Output low level

V_OL

V_OH

V_DD=16V, I_O=-20mA

V_DD=16V, I_O=20mA

-

10

-

0.8

V

Output high level

-

Output clamp voltage level

Output rising time

Output falling time

V_{O_CLAMP}

t_r

18

220

70

V

V_DD=16V, C_L=1nf

-

ns

t_f

-

Frequency Shuffling

Shuffling frequency

f_SHUFFLING

RI=100k

-

64

-

Hz

%

Modulation range/Base

frequency

△f_OSC

-3

3

Table 4. Electrical Characteristics

December, 2013 Rev. 1.1

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Datasheet

Current Mode PWM Controller

SDC4563

Function Description

The SDC4563 is a highly integrated PWM controller IC

optimized for offline flyback converter applications in sub

30W power range. The extended burst mode control

greatly reduces the standby power consumption and helps

the design easily meet the international power

conservation requirements.

condition, the FB input drops below burst mode threshold

level, device enters burst mode control. The gate drive

output switches only when VDD voltage drops below a

preset level and FB input is active to output an on state,

otherwise the gate drive remains at off state to minimize

the switching loss and reduces the standby power

consumption to the greatest extend. The frequency

control also eliminates the audio noise at any loading

conditions.

Startup Current and Start up Control

Startup current of SDC4563 is designed to be very low so

that VDD could be charged up above UVLO threshold level

and device starts up quickly. A large value startup resistor

can therefore be used to minimize the power loss yet

provides reliable startup in application.

Oscillator Operation

A resistor connected between RI and GND sets the

constant current source to charge/discharge the internal

cap and thus the PWM oscillator frequency is determined.

The relationship between RI and switching frequency

follows the below equation within the specified RI in kΩ

range at nominal loading operational condition.

Operating Current

The Operating current of SDC4563 is low at 1.4mA. Good

efficiency is achieved with SDC4563 low operating current

together with extended burst mode control features.

6500

fosc =

(kHz)

Frequency shuffling for EMI improvement

RI(kΩ)

The frequency shuffling/jittering (switching frequency

modulation) is implemented in SDC4563. The oscillation

frequency is modulated with a random source so that the

tone energy is spread out. The spread spectrum minimizes

the conduction band EMI and therefore reduces system

design challenge.

Current Sensing and Leading Edge Blanking

Cycle-by-cycle current limiting is offered in SDC4563

current mode PWM control. The switch current is

detected by a sense resistor into the sense pin. An internal

leading edge blanking circuit chops off the sense voltage

spike at initial MOSFET on state due to snubber diode

reverse recovery so that the external RC filtering on sense

input is no longer required. The current limit comparator

is disabled and thus cannot turn off the external MOSFET

during the blanking period. PWM duty cycle is determined

by the current sense input voltage and the FB input

voltage.

Extended Burst Mode Operation

Under zero load or light load condition, majority of the

power dissipation in a switching mode power supply is

from switching loss on the MOSFET transistor, the core

loss of the transformer and the loss on the snubber circuit.

The magnitude of power loss is in proportion to the

number of switching events within a fixed period of time.

Reducing switching events leads to the reduction on the

power loss and thus conserves the energy.

Internal Synchronized Slope Compensation

Built-in slope compensation circuit adds voltage ramp

onto the current sense input voltage for PWM generation.

This greatly improves the close loop stability at CCM and

prevents the sub-harmonic oscillation and thus reduces

SDC4563 adjusts the switching mode according to the

loading condition. Under no load to light/medium load

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Datasheet

Current Mode PWM Controller

SDC4563

the output ripple voltage.

and good EMI system design is easier to achieve with

this dedicated control scheme. An internal 18V clamp is

added for MOSFET gate protection at higher than

expected VDD input.

Gate Drive

SDC4563 gate is connected to an external MOSFET gate

for power switch control. Too weak the gate drive

strength results in higher conduction and switch loss of

MOSFET while too strong gate drive output

compromises the EMI. A good tradeoff is achieved

through the built-in totem pole gate design with right

output strength and dead time control. The low idle loss

Protection Controls

Good power supply system reliability is achieved with its

rich protection features including cycle-by-cycle current

limiting (OCP), over load protection (OLP) and over

voltage clamp, under voltage lockout on VDD (UVLO).

Typical Application

V+

GND

GND GATE

VDD

FB

RI

SENSE

SDC4563

Figure 4. Typical Application

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Datasheet

Current Mode PWM Controller

SDC4563

Typical Performance Characteristics

20

15

10

5

5.0

4.6

4.2

3.8

3.4

3.0

0

8

2

6

10 12

14

16

4

-20

10

40

Temp(°C)

130

70

100

V_DD(V)

Figure 5. VDD Startup Current vs. Voltage

Figure 6. I_STARTvs. Temp

9.0

2.0

1.6

1.2

0.8

0.4

0

8.8

8.6

8.4

8.2

8.0

25

5

10

20

30

0

15

_DD(V)

-20

10

40

70

100

130

V

Temp(°C)

Figure 7. VDD UVLO vs. Operation Current

14.5

Figure 8. V_UVLO(ON)vs. Temp

140

115

14.4

14.3

14.2

14.1

14.0

90

65

40

-20

10

40

Temp(°C)

70

100

130

50

70

90

110

RI(kΩ)

130

150

Figure 9. V_UVLO(OFF)vs. Temp

Figure 10. RI vs. f_OSC

December, 2013 Rev. 1.1

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Datasheet

Current Mode PWM Controller

SDC4563

Typical Performance Characteristics(Continued)

66.5

66

65.5

65

64.5

64

63.5

-20

5

30

55

Temp(°C)

80

105

130

Figure 11. f_OSCvs. Temp

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Datasheet

Current Mode PWM Controller

SDC4563

Package Dimension

SOT-23-6

Dimensions In Millimeters

Dimensions In Inches

Symbol

Min

Max

1.250

0.100

1.150

0.500

0.200

3.020

1.700

2.950

Min

Max

0.049

0.004

0.045

0.020

0.008

0.119

0.067

0.116

A

A1

A2

b

1.050

0.000

1.050

0.300

0.100

2.820

1.500

2.650

0.041

0000

0.041

0.012

0.004

0.111

0.059

0.104

c

D

E

E1

e

0.950(BSC)

0.037(BSC)

e1

L

1.800

0.300

0°

2.000

0.600

8°

0.071

0.012

0°

0.079

0.024

8°

θ

December, 2013 Rev. 1.1

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Datasheet

Current Mode PWM Controller

SDC4563

Shaoxing Devechip Microelectronics Co., Ltd.

http://www.sdc-semi.com/

IMPORTANT NOTICE

Information in this document is provided solely in connection with Shaoxing Devechip Microelectronics Co., Ltd. (abbr. SDC) products.

SDC reserves the right to make changes, corrections, modifications or improvements, to this document, and the products and services

described herein at anytime, without notice. SDC does not assume any responsibility for use of any its products for any particular

purpose, nor does SDC assume any liability arising out of the application or use of any its products or circuits. SDC does not convey

any license under its patent rights or other rights nor the rights of others.

Contact us:

Headquarters of Shaoxing

Address: Tian Mu Road, No13,

Shaoxing city, Zhejiang province, China

Zip code: 312000

Shenzhen Branch

Address: 22A, Shangbu building, Nan Yuan Road, No.68,

Futian District, Shenzhen city, Guangdong province, China

Zip code: 518031

Tel: (86) 0575-8861 6750

Tel: (86) 0755-8366 1155

Fax: (86) 0575-8862 2882

Fax: (86) 0755-8301 8528

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型号：	SDC4563
厂家：	Shaoxing Devechip Microelectronics Co., Ltd
描述：	Current Mode PWM Controller
文件：	总13页 (文件大小：415K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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