SDC4566_技术文档

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Features

Datasheet

Current Mode PWM Controller

General Description

SDC4566

SDC4566 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 60W range.



Frequency shuffling technology for improved emc

performance



Audio noise free operation

Extended burst mode control for improved efficiency

and minimum standby power design

Internal synchronized slope compensation

Low VCC startup current and low operating current

Leading edge blanking on current sense input

Good protection coverage with auto self-recovery

（UVLO/OVP/ OCP/OLP/OTP）

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.



FB/CS open loop protection

Secondary Rectifier Short Protection

Package: SOT-23-6

SDC4566 offers complete protection coverage with

automatic self-recovery feature including cycle-by-cycle

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

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

gate drive output is clamped to maximum 14V to protect

the power MOSFET.

Applications



Battery charger

Power adapter

Set-top box power supplies

SOT-23-6

Figure 1. Package Type

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Current Mode PWM Controller

Pin Configuration

SDC4566

Package: SOT-23-6

1

6

5

4

GND

GATE

VCC

FB

2

3

PRO

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

FB

3

4

5

6

PRO

SENSE

VCC

For external arbitrary OVP or OTP.

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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Current Mode PWM Controller

Functional Block Diagram

SDC4566

VCC

5

V_L-TH

﹢

﹣

Auto

Recovery

Auto

Recovery

﹢

﹣

PRO

3

V_CLAMP

﹢

﹣

V_H-TH

Secondary Rectifier Short

& SENSE Open Protection

V_SRSP

POR

﹢

﹣

Shutdown

Logic

﹢

﹣

V_UVLO-ON/V_UVLO-ON

Counter

Bias &

Bandgap

FB Open

Sensing

OLP

Oscillator

Dmax

V_FB-OP

SS

Constant

Power

SET

Soft

Drive

S

Q

6

GATE

﹣

2

4

FB

R

CLR

﹢

Slope

Ramp

SENSE

V_SENSE-th

﹢

﹣

LEB

Σ

1

GND

Figure 3. Functional Block Diagram

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Current Mode PWM Controller

Ordering Information

SDC4566

-

X

SDC4566 X

X

E1: Pb-free

G1: Halogen-free

Circuit Type

Package

SOT-23-6: J

TR: Tape Reel

Part Number

Marking ID

Temperature

Package

Packing Type

Range

Pb-free

Halogen-free

SDC4566JTR-G1

Pb-free

4566

Halogen-free

SOT-23-6

SDC4566JTR-E1

4566G

Tape Reel

-40℃-85℃

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Datasheet

Current Mode PWM Controller

SDC4566

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

permanent damage to the device.)

Parameter

VCC DC supply voltage

Symbol

V_CC

Value

-0.3~30

32

Unit

V

VCC clamp voltage

V_{CC_CLAMP}

I_CLAMP

V_FB

V

VCC DC clamp current

10

mA

V

V_FBinput voltage

-0.3~7

150

SENSE input voltage

V_SENSE

V_PRO

T_J

V

V_PROinput voltage

V

Operating junction temperature

Storage temperature

°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_CC

Min

10

Max

Unit

VCC DC supply voltage

30

70

85

V

Oscillation frequency

f_OSC

60

kHz

°C

Operating Temperature Range

T_OP

-40

Table 3. Recommended Operating Conditions

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Current Mode PWM Controller

SDC4566

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

Parameter

Symbol

Condition

Min

Typ

Max

Unit

Supply Voltage (VCC)

V_CC=12.5V, RI=100k,Measure

Leakage current into VCC

V_CC=16V,

VCC start up current

I_STARTUP

-

3

20

uA

Operation current

I_CC

-

1.6

7.5

14.5

32

-

mA

V

RI=100k, V_FB=3V

VCC under voltage lockout enter

V_UVLO(ON)

V_UVLO(OFF)

V_{CC_CLAMP}

-

6.5

13.5

30

8.5

15.5

34

VCC under voltage lockout exit

(recovery)

-

V

VCC zener clamp voltage

I_VCC=10mA

V

Feedback Input Section(FB Pin)

FB open loop voltage

V_{FB_OPEN}

-

4.2

0.4

-

V

Short FB pin to GND and

Measure Current

FB pin short circuit current

I_{FB_SHORT}

V_{TH_0D}

V_{TH_PL}

mA

Zero duty cycle fb threshold

voltage zero

VCC=16V

-

0.85

4.1

V

Power limiting FB threshold

voltage

3.3

3.7

Power limiting debounce time

The threshold enter burst mode

The threshold exit burst mode

t_{D_PL}

-

90

1.1

1.2

-

ms

V

V-Burst-L

V-Burst-H

V

Current Sense Input(Sense Pin)

Over current threshold voltage

at zero duty cycle

V_SENSE-th

FB=3.3V

0.70

0.75

0.80

V

V_SENSE-

-CLAMP

t_LEB

SENSE clamp voltage

-

0.95

300

75

-

V

Leading edge blanking time

ns

Over current detection and

control delay

t_PD

OTP/OVP Protection (PRO PIN)

Normal oscillation frequency

Shuffling frequency frequency

Burst mode base frequency

f_OSC

f_Shuffling

f_Green

-

60

-3

65

22

70

+3

kHz

%

-

V_CC= 16V

kHz

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Datasheet

Current Mode PWM Controller

SDC4566

Parameter

Symbol

Condition

Min

Typ

80

-

Max

90

5

Unit

%

Maximum duty cycle

D_MAX

f_DV-TEMP

f_DV-VCC

V_PRO

V_CC=16V, FB=3V, CS=0

70

Frequency temperature stability

Frequency voltage stability

PRO open load voltage

PRO low protection voltage

PRO high voltage protection

Soft start time

V_CC=16V, Ta= -20°C to 100 °C

-

%

V_CC=12V~25V,

-

5

%

-

2.5

1.0

4.0

4

-

V

V_L-TH

-

0.95

3.7

3

1.05

4.3

5

V

V_H-TH

t_soft

-

V

ms

Gate Drive Output

V_CC=16V, I_O=-20mA

V_CC=16V, I_O=20mA

-

Output low level

V_OL

V_OH

V_CLAMP

t_r

-

10

-

0.8

V

Output high level

-

Output clamp voltage level

Output rising time

Output falling time

14

125

40

V

V_CC=16V, CL =1nf

V_CC=16V, CL=1nf

-

ns

t_f

-

Table 4. Electrical Characteristics

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Datasheet

Current Mode PWM Controller

Function Description

SDC4566

The SDC4566 is a highly integrated PWM controller IC

optimized for offline flyback converter applications in

sub 60W power range. The extended burst mode control

greatly reduces the standby power consumption and

helps the design easily meet the international power

conservation requirements.

the loading condition. Under no load to light/medium

load 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 SDC4566 is designed to be very low so

that VCC 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

It can typically operate at built-in 65kHz center

frequency and features frequency jittering function. Its

jittering depth is ±3% with about 4ms envelope

frequency at 65kHz.

Operating Current

The Operating current of SDC4566 is low at 1.8mA. Good

efficiency is achieved with SDC4566 low operating

current together with extended burst mode control

features.

Current Sensing and Leading Edge Blanking

Cycle-by-cycle current limiting is offered in SDC4566

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.

Frequency shuffling for EMI improvement

The frequency Shuffling/jittering (switching frequency

modulation) is implemented in SDC4566. 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.

Extended Burst Mode Operation

Under zero load or light load condition, ment 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 freque leads to the reduction

on 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 the output ripple voltage.

Gate Drive

SDC4566 self adjusts the switching mode according to

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Current Mode PWM Controller

SDC4566

SDC4566 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

and good EMI system design is easier to achieve with

this dedicated control scheme. An internal 14V clamp is

added for MOSFET gate protection at higher than

expected VCC input.

Protection Controls

Good power supply system reliability is achieved with its

rich protection features in- cluding cycle-by-cycle current

limiting (OCP), Over Load Protection (OLP) and over

voltage clamp, Under Voltage Lockout on VCC (UVLO).

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Current Mode PWM Controller

SDC4566

Typical Performance Characteristics

15.0

14.9

14.8

14.7

14.6

14.5

14.4

14.3

7.8

7.7

7.6

7.5

7.4

7.3

-40 -20

0

20

40

60

80 100 120 140

-40 -20

0

20

40

60

80 100 120 140

Temperature(°C)

Figure 4. V_UVLO-OFF(V) vs. Temperature（℃）

Figure 5. V_UVLO-ON(V) vs. Temperature（℃）

2.50

67

66

65

64

63

2.45

2.40

2.35

2.30

2.25

2.20

-40 -20

0

20 40 60 80 100 120 140

-40 -20

0

20 40 60 80 100 120 140

Temperature(°C)

Figure 6. f_OSC(kHz) vs. Temperature(℃)

Figure 7. V_PRO(V) vs. Temperature(℃)

3.9

3.8

3.7

3.6

3.5

3.4

3.3

101.75

101.25

100.75

100.25

99.75

-40 -20

0

20 40 60 80 100 120 140

-40 -20

0

20 40 60 80 100 120 140

Temperature(°C)

Figure 8. I_PRO(mA) vs. Temperature(℃)

Figure 9. V_{FB_OLP}(V) vs. Temperature(℃)

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Current Mode PWM Controller

SDC4566

特性曲线(接上)

1.68

1.67

1.66

1.65

-40 -20 0 20 40 60 80 100 120 140

Temperature(°C)

Figure 10. I_CC-OP(mA) vs. Temperature(℃)

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Current Mode PWM Controller

Typical Application

SDC4566

V+

GND

GND GATE

VCC

FB

PRO

SENSE

SDC4566

Figure 11. Typical Application

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Current Mode PWM Controller

SDC4566

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

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Current Mode PWM Controller

SDC4566

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：	SDC4566
厂家：	Shaoxing Devechip Microelectronics Co., Ltd
描述：	Current Mode PWM Controller
文件：	总14页 (文件大小：440K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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