SDC4569AUTR-E1_技术文档

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Features

Datasheet

Current Mode PWM Controller

General Description

SDC4569A

SDC4569A 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

External programmable pwm switching

Internal synchronized slope compensation

Low VDD startup current and low operating current

Leading edge blanking on current sense input

Good protection coverage with auto self-recovery

(UVLO/OVP/OCP/OLP)

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.



Package: SOP-8

SDC4569A 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 12V to protect

the power MOSFET.

Applications



Battery charger

Power adaptor

Set-top box power supplies

SOP-8

Figure 1. Package Type

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Current Mode PWM Controller

Pin Configuration

SDC4569A

Package: SOP-8

GND

GATE

1

8

FB

VIN

RI

7

6

2

3

VDD

SENSE

NC

4

5

Figure 2. Pin Configuration

Pin No.

Pin Name

Function

1

GND

Ground

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

2

3

4

FB

VIN

RI

SENSE pin input

Connected through a large value resistor to rectified line input for startup IC supply

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

the PWM frequency

5

6

7

8

NC

-

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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Current Mode PWM Controller

SDC4569A

Functional Block Diagram

RI

Current

Reference

POR

VIN

Soft

Drive

GATE

SET

S

Q

Shuffling

OSC

VDD

UVLO

VDD

CLR

R

Burst

Mode controller

Clamping

V_{TH_OC}

Leading

Edge

Blanking

SENSE

FB

Internal

Supply

Regulator

OVP

Slope

Compensation

OLP

GND

Figure 3. Functional Block Diagram

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Current Mode PWM Controller

Ordering Information

SDC4569A

-

X

SDC4569A X

X

E1: Pb-free

G1: Halogen-free

Circuit Type

Blank: Tube

TR: Tape Reel

Package

SOP-8: U

Part Number

Pb-free Halogen-free

Marking ID

Temperature

Range

Packing

Type

Package

Pb-free

Halogen-free

4569AG

SOP-8

SDC4569AUTR-E1 SDC4569AUTR-G1

4569A

Tape Reel

-40℃~85℃

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Current Mode PWM Controller

SDC4569A

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

permanent damage to the device.)

Parameter

VDD DC supply voltage

Symbol

V_DD

Value

-0.3~30

32

Unit

V

VDD clamp voltage

V_{DD_CLAMP}

I_CLAMP

V_FB

V

VDD DC clamp current

10

mA

V

V_FBinput voltage

-0.3~7

150

SENSE input voltage

V_SENSE

V_RI

V

V_RIinput voltage

V

Operating junction temperature T_J

Storage temperature T_STG

Latch-up test per JEDEC 78

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

ESD,MM model per JEDEC EIA/JESD22-A115

T_J

°C

mA

V

T_STG

-55~150

200

-

HBM

MM

2000

200

V

Table 2. Absolute Maximum Ratings

Recommended Operating Conditions

Parameter

Symbol

V_DD

Min

10

Max

Unit

VDD DC supply voltage

30

85

70

V

Operating Temperature Range

Oscillation frequency

T_OP

-40

60

°C

kHz

f_OSC

Table 3. Recommended Operating Conditions

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Current Mode PWM Controller

SDC4569A

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

Parameter Symbol Condition

Supply Voltage (VDD)

V_DD=12.5V, RI=24k

Min

Typ

Max

Unit

VDD start up current

I_STARTUP

Measure Leakage

current into VDD

V_DD=16V, RI=24k,

V_FB=3V

-

3

20

uA

Operation current

I_DD

-

1.4

7.5

14

-

mA

V

VDD under voltage lockout enter

V_UVLO(ON)

V_UVLO(OFF)

V_{DD_CLAMP}

-

6.5

13

30

8.5

15

34

VDD under voltage lockout exit

(recovery)

-

V

VDD zener clamp voltage

I_DD=10mA

32

V

Feedback Input Section(FB pin)

FB open loop voltage

V_{FB_OPEN}

I_{FB_SHORT}

-

4.8

0.8

-

V

Short FB pin to GND

and Measure Current

FB pin short circuit current

mA

Zero duty cycle FB threshold voltage zero

Power limiting FB threshold voltage

Power limiting debounce time

V_{TH_0D}

V_{TH_PL}

t_{D_PL}

V_DD=16V, RI=24k

-

0.85

V

-

3.7

35

-

ms

V_DD=16V,RI=24k,

FB=3V,CS=0

Maximum duty cycle

DC_MAX

70

80

90

%

Current Sense Input(Sense Pin)

Leading edge blanking time

t_BLANKING

t_{D_OC}

RI = 24K

-

300

75

-

ns

V_DD= 16V,

Over current detection and control delay

CS>V_{TH_OC}, FB=3.3V

Over current threshold voltage at zero duty

cycle

V_{TH_OC}

FB=3.3V, RI=24k

0.70

0.75

0.80

V

Oscillator

Normal oscillation frequency

Frequency temperature stability

Frequency voltage stability

f_OSC

RI=24k

60

-

65

5

70

-

kHz

%

V_DD=16V,RI=24k,

Δf_TEMP

Δf_VDD

Ta=-20°C~ 100°C

V_DD=12V~25V,RI=24k

-

5

-

%

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Current Mode PWM Controller

SDC4569A

Parameter

RI open load voltage

Burst mode base frequency

Soft start time

Symbol

V_{RI_OPEN}

f_BM

Condition

Min

Typ

2

Max

Unit

V

-

V_DD= 16V, RI =24k

-

22

7

kHz

ms

t_SOFT

Gate Drive Output

Output low level

V_OL

V_OH

V_CLAMP

t_r

V_DD=16V, Io=-20mA

V_DD=16V, Io=20mA

-

10

-

0.8

V

Output high level

-

Output clamp voltage level

Output rising time

Output falling time

12

125

50

V

V_DD=16V, CL=1nf

-

ns

t_f

-

Frequency Shuffling

Shuffling frequency

f_OSC

RI=24k

-

64

-

Hz

%

Modulation range/Base frequency

Δf_OSC

-3

3

Table 4. Electrical Characteristics

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Current Mode PWM Controller

Function Description

SDC4569A

The SDC4569A is a highly integrated PWM controller IC

optimized for offline flyback converter applications in sub

65W 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 SDC4569A 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 SDC4569A is low at 1.4mA. Good

efficiency is achieved with SDC4569A low operating

current together with extended burst mode control

features.

1560

fosc =

(kHz)

Frequency shuffling for EMI improvement

RI(kΩ)

The frequency shuffling/jittering (switching frequency

modulation) is implemented in SDC4569A. 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 SDC4569A

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, meet 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 frequent 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.

SDC4569A self adjusts the switching mode according to

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Current Mode PWM Controller

SDC4569A

This greatly improves the close loop stability at CCM

control. The low idle loss and good EMI system design is

easier to achieve with this dedicated control scheme. An

internal 12V clamp is added for MOSFET gate protection at

higher than expected VDD input.

and prevents the sub-harmonic oscillation and thus

reduces the output ripple voltage.

Gate Drive

Protection Controls

SDC4569A 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

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

VIN

RI

SENSE

NC

SDC4569A

Figure 4. Typical Application

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Current Mode PWM Controller

SDC4569A

Package Dimension

SOP-8

Dimensions In Millimeters

Dimensions In Inches

Symbol

Min

Max

1.750

0.250

1.550

0.510

0.250

5.100

Min

Max

0.069

0.010

0.061

0.020

0.010

0.201

A

A1

A2

b

1.350

0.100

1.350

0.330

0.170

4.700

0.053

0.004

0.053

0.013

0.007

0.185

c

D

e

1.270(BSC)

0.050(BSC)

E

5.800

3.800

0.400

0°

6.200

4.000

1.270

8°

0.228

0.150

0.016

0°

0.244

0.157

0.050

8°

E1

L

θ

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Datasheet

Current Mode PWM Controller

SDC4569A

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：	SDC4569AUTR-E1
厂家：	Shaoxing Devechip Microelectronics Co., Ltd
描述：	Current Mode PWM Controller
文件：	总11页 (文件大小：362K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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