Richtek R7732AGE, R7732GGE, R7732HGE, R7732LGE, R7732RGE Schematic [ru]

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R7732

Enhanced Quadruple Mode PWM Flyback Controller

General Description

R7732 series is the successor of R7730/1 and fully compatible with most of SOT-23-6 product so far in the market. It's an enhanced, high-performance and current mode PWM controller. It focuses on "easy to design" in different applications and it will save both design effort and external components.

Besides the general features shown in the Features section, R7732 covers wide protection options, such as internal Over Load Protection (OLP) and Over Voltage Protection (OVP) to eliminate the external protection circuits. Moreover, it also features Secondary Rectifier Short Protection (SRSP) and CS pin open protection. This protection will make the PSU design for reliability and safety easier.

R7732 is designed for power supply such as NB adaptor which is a very cost effective and compact design. The precise external OVP and Over Temperature Protection (OTP) can be implemented by very simple circuit. The start-up resistors can also be replaced by bleeding resistors to save power loss and component count.

Ordering Information

R7732

Package Type

E : SOT-23-6

Lead Plating System

G : Green (Halogen Free and Pb Free)

R7732 Version (Refer to Version Table)

Note :

Richtek products are :

}RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.

}Suitable for use in SnPb or Pb-free soldering processes.

Features

λUVLO 9V/14V

λSoft-Start Function

λCurrent Mode Control

λBuilt-in Slope Compensation

λInternal Leading Edge Blanking

λPWM Quadruple Mode for Green-Mode

λExcellent Green Power Performance

λCycle-by-Cycle Current Limit

λInternal Over Voltage Protection

λInternal Over Load Protection

λSecondary Rectifier Short Protection

λOpto-Coupler Short Protection

λFeedback Open-Loop Protection

λCS Pin Open Protection

λBuilt-in Jittering Frequency

λBuilt-in PRO Pin for External Arbitrary OVP/OTP

λSoft Driving for EMI Noise

λHigh Noise Immunity

λRoHS Compliant and Halogen Free

Application

λSwitching AC/DC Adaptor and Battery Charger

λPrinter Power Supply

λDVD Open Frame Power Supply

λSet-Top Box (STB)

λATX Standby Power

λTV/Monitor Standby Power

λPC Peripherals

λNB Adaptor

Pin Configurations

(TOP VIEW)

GATE VDD CS

6 5 4

2 3

GND COMP PRO

SOT-23-6

R7732-00 May 2011

www.richtek.com

 

1

R7732

Marking Information

R7732GGE

 

 

R7732LGE

 

 

R7732AGE

 

 

 

 

 

F0= : Product Code

 

 

 

F2= : Product Code

 

 

 

F3= : Product Code

 

 

 

 

 

 

 

 

 

 

F0=DNN

DNN : Date Code

 

F2=DNN

DNN : Date Code

 

F3=DNN

DNN : Date Code

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R7732HGE

 

 

R7732RGE

 

 

 

 

 

 

 

 

 

F4= : Product Code

 

 

 

F6= : Product Code

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

F4=DNN

DNN : Date Code

 

F6=DNN

DNN : Date Code

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R7732 Version Table

Version

R7732G

R7732R

R7732L

R7732A

R7732H

 

 

 

 

 

 

Frequency

65kHz

65kHz

65kHz

65kHz

100kHz

 

 

 

 

 

 

OLP Delay Time

56ms

56ms

56ms

28ms

36ms

 

 

 

 

 

 

Internal OVP(27V)

Auto Recovery

Auto Recovery

Latch

Latch

Auto Recovery

 

 

 

 

 

 

OLP & SRSP

Auto Recovery

Auto Recovery

Auto Recovery

Latch

Auto Recovery

 

 

 

 

 

 

PRO Pin High

Latch

Auto Recovery

Latch

Latch

Auto Recovery

 

 

 

 

 

 

PRO Pin Low

Auto Recovery

Latch

Latch

Latch

Latch

 

 

 

 

 

 

Typical Application Circuit

AC Mains

 

 

 

(90V to 265V)

 

 

 

 

 

5

 

3

PRO

VDD

GATE 6

2

 

R7732

CS 4

COMP

GND

 

 

 

NTC

 

1

 

 

Vo+

+

+

 

Vo-

#

# See Application Information

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R7732-00 May 2011

2

 

Richtek R7732AGE, R7732GGE, R7732HGE, R7732LGE, R7732RGE Schematic

R7732

Functional Pin Description

Pin No.

Pin Name

Pin Function

 

 

 

1

GND

Ground.

 

 

 

2

COMP

Voltage Feedback Pin. By connecting an opto-coupler to close control loop and achieve

the regulation.

 

 

 

 

 

3

PRO

For External Arbitrary OVP or OTP.

 

 

 

4

CS

Primary Current Sense Pin.

 

 

 

5

VDD

Power Supply Pin.

 

 

 

6

GATE

Gate Drive Output to drive the external MOSFET.

 

 

 

Function Block Diagram

 

 

 

 

 

 

 

 

VDD

 

 

VL_TH

 

 

 

 

 

 

 

 

 

+

 

Auto

Auto

 

 

 

IBIAS

 

 

 

 

 

 

 

-

 

Recovery

Recovery

OVP

 

PRO

 

 

 

 

 

 

+

 

 

 

 

 

 

 

 

27V

 

 

 

+

 

 

 

-

 

 

 

 

Latch

Latch

 

 

 

 

 

-

 

 

 

 

 

 

 

 

 

 

 

 

 

VH_TH

 

 

 

 

 

 

 

 

 

 

Secondary Rectifier Short

 

 

 

 

 

1.7V

-

& CS Open Protection

Shutdown

POR

 

 

 

 

 

 

 

 

 

 

 

+

 

 

 

 

 

 

 

 

 

Logic

 

 

 

 

 

 

 

 

UVLO

 

 

 

 

 

 

 

 

 

 

 

 

Brownout

 

 

+

 

 

 

 

 

 

 

9V/14V

 

 

 

Sensing

 

 

-

 

 

 

 

 

 

 

 

 

 

 

 

 

Counter

 

 

 

 

 

COMP Open

 

 

 

Bias &

 

 

 

Sensing

 

 

Bandgap

 

 

 

 

OLP

 

Oscillator

 

 

 

 

 

 

 

 

 

 

 

 

Constant

SS

Dmax

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Power

 

 

 

 

 

 

 

 

 

 

 

S

Soft Driver

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-

Q

GATE

 

 

 

 

 

 

 

 

COMP

 

 

 

 

 

-

R

 

 

 

 

 

 

+

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PWM

 

 

 

 

 

 

 

Slope

Comparator

 

 

CS

 

 

 

 

 

 

 

 

 

 

 

 

Ramp

 

 

VCOMP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Quadruple Mode

VBURL

 

 

 

 

 

 

 

VBURH

 

 

LEB

 

 

 

 

 

 

X3

 

 

 

VDD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GND

R7732-00

May 2011

 

 

 

 

 

www.richtek.com

 

 

 

 

 

 

 

 

3

R7732

Absolute Maximum Ratings (Note 1)

λ Supply Input Voltage, VDD -----------------------------------------------------------------------------------------

0.3V to 30V

λ GATE Pin --------------------------------------------------------------------------------------------------------------

0.3V to 16.5V

λ PRO, COMP, CS Pin -----------------------------------------------------------------------------------------------

0.3V to 6.5V

λ IDD -----------------------------------------------------------------------------------------------------------------------

10mA

λ Power Dissipation, PD @ TA = 25°C

 

SOT-23-6 --------------------------------------------------------------------------------------------------------------

0.4W

λ Package Thermal Resistance (Note 2)

 

SOT-23-6, θJA --------------------------------------------------------------------------------------------------------

250°C/W

λ Junction Temperature -----------------------------------------------------------------------------------------------

150°C

λ Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------

260°C

λ Storage Temperature Range ---------------------------------------------------------------------------------------

65°C to 150°C

λ ESD Susceptibility (Note 3)

 

HBM (Human Body Mode) -----------------------------------------------------------------------------------------

3kV

MM (Machine Mode) ------------------------------------------------------------------------------------------------

250V

Recommended Operating Conditions

(Note 4)

λ Supply Input Voltage, VDD -----------------------------------------------------------------------------------------

12V to 25V

λ Junction Temperature Range --------------------------------------------------------------------------------------

40°C to 125°C

λ Ambient Temperature Range --------------------------------------------------------------------------------------

40°C to 85°C

Electrical Characteristics

(VDD = 15V, TA = 25°C, unless otherwise specified)

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

 

 

 

 

 

 

 

 

VDD Section

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VDD Over Voltage Protection Level

VOVP

 

 

26

27

28

V

VDD Zener Clamp

VZ

 

 

29

--

--

V

 

 

 

 

 

 

 

 

On Threshold Voltage

VTH_ON

 

 

13

14

15

V

Off Threshold Voltage

VTH_OFF

 

 

8.5

9

9.5

V

 

 

 

 

 

 

 

 

VDD Holdup Mode Entry Point

VDD_LOW

VCOMP <1.6V

 

--

10

--

V

VDD Holdup Mode Ending Point

VDD_HIGH

VCOMP <1.6V

 

--

10.5

--

V

Latch-off Voltage

VLH

 

 

--

14

--

V

Latched Reset Voltage

VLH_RST

 

 

--

9

--

V

Start-up Current

IDD_ST

VDD = VTH_ON – 0.2V,

 

--

20

35

μA

TA= -40ºC to 100ºC

(Note 5)

 

 

 

 

 

 

Operating Supply Current

IDD_OP

VDD= 15V, VCOMP = 2.5V,

--

1.3

2.2

mA

GATE pin open

 

 

 

 

 

 

 

 

Latch-off Operating Current

IDD_LH

TA= -40ºC to 100ºC

(Note 5)

--

--

40

μA

To be continued

www.richtek.com

R7732-00 May 2011

4

 

R7732

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

 

 

 

 

 

 

 

Oscillator Section

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R7732G/R/L/A

60

65

70

kHz

Normal PWM Frequency

fOSC

 

 

 

 

 

R7732H

92

100

108

kHz

 

 

 

 

 

 

 

 

 

Frequency Reduction Mode Minimum

fFR_MIN

R7732G/R/L/A

18

22

- -

kHz

Frequency

R7732H

--

25

- -

kHz

 

 

 

 

 

 

 

 

Maximum Duty Cycle

DCYMAX

 

70

75

80

%

 

 

 

 

 

 

 

PWM Frequency Jitter Range

f

 

--

±6

- -

%

 

 

 

 

 

 

 

PWM Frequency Jitter Period

TJIT

For 65kHz

--

4

- -

ms

 

 

 

 

 

 

 

Frequency Variation Versus

fDV

VDD= 12V to 25V

--

--

2

%

VDD Deviation

 

 

 

 

 

 

Frequency Variation Versus

fDT

TA= -30°C to 105°C

--

--

5

%

Temperature Deviation

(Note 5)

 

 

 

 

 

COMP Input Section

 

 

 

 

 

 

 

 

 

 

 

 

 

Open-Loop Voltage

VCOMP_OP

COMP pin open

5.5

5.75

6

V

 

 

 

 

 

 

 

 

 

R7732G/R/L

--

56

- -

ms

 

 

 

 

 

 

 

COMP Open-Loop Protection Delay Time

TOLP

R7732A

--

28

- -

ms

 

 

 

 

 

 

 

 

 

R7732H

--

36

- -

ms

 

 

 

 

 

 

 

Short Circuit Current

IZERO

VCOMP= 0V

--

1.2

2.2

mA

 

 

 

 

 

 

 

Frequency Reduction Mode Entry Voltage

VFR_ET

 

--

3

- -

V

 

 

 

 

 

 

 

Frequency Reduction Mode Ending

VFR_ED

R7732G/R/L/A

--

2.9

- -

V

Voltage

R7732H

--

2.8

- -

V

 

 

 

 

 

 

 

 

Current-Sense Section

 

 

 

 

 

 

 

 

 

 

 

 

 

Initial Peak Current Limitation Offset

VCS_TH

 

0.68

0.7

0.72

V

 

 

 

 

 

 

 

Leading Edge Blanking Time

TLEB

(Note 6)

150

250

350

ns

Internal Propagation Delay Time

TPD

(Note 6)

--

100

- -

ns

Minimum On Time

TON_MIN

 

250

350

450

ns

 

 

 

 

 

 

 

GATE Section

 

 

 

 

 

 

 

 

 

 

 

 

 

Rising Time

TR

VDD= 15V, CL= 1nF

--

125

- -

ns

 

 

 

 

 

 

 

Falling Time

TF

VDD= 15V, CL= 1nF

--

40

- -

ns

GATE Output Clamping Voltage

VCLAMP

VDD= 25V

--

14

- -

V

 

 

 

 

 

 

 

PRO Interface Section

 

 

 

 

 

 

 

 

 

 

 

 

 

Pull Low Threshold

VL_TH

 

0.47

0.5

0.53

V

Pull High Threshold

VH_TH

 

3.5

3.8

4.1

V

 

 

 

 

 

 

 

Internal Bias Current

IBIAS

 

90

100

110

μA

Pull High Sinking Current

ISINK

(Note 7)

--

--

1.2

mA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R7732-00 May 2011

 

 

 

 

www.richtek.com

 

 

 

 

 

 

5

R7732

Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability.

Note 2. θJA is measured in natural convection at TA = 25°C on a low effective single layer thermal conductivity test board of JEDEC 51-3 thermal measurement standard.

Note 3. Devices are ESD sensitive. Handling precaution is recommended.

Note 4. The device is not guaranteed to function outside its operating conditions.

Note 5. Guaranteed by design.

Note 6. Leading edge blanking time and internal propagation delay time are guaranteed by design.

Note 7. The sourcing current of PRO pin must be limited below 5mA. Otherwise it may cause permanent damage to the device.

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