Richtek R7732AGE, R7732GGE, R7732HGE, R7732LGE, R7732RGE Schematic

Enhanced Quadruple Mode PWM Flyback Controller

GND COMP PRO

CSVDDGATE

4

2 3

56

R7732

Package Type E : SOT-23-6

Lead Plating System G : Green (Halogen Free and Pb Free)

R7732 Version (Refer to Version Table)

R7732

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.

Features

ll

l UVLO 9V/14V

ll

l Soft-Start Function

ll

l Current Mode Control

ll

l Built-in Slope Compensation

ll

l Internal Leading Edge Blanking

ll

l PWM Quadruple Mode for Green-Mode

ll

l Excellent Green Power Performance

ll

l Cycle-by-Cycle Current Limit

ll

l Internal Over Voltage Protection

ll

l Internal Over Load Protection

ll

l Secondary Rectifier Short Protection

ll

l Opto-Coupler Short Protection

ll

l Feedback Open-Loop Protection

ll

l CS Pin Open Protection

ll

l Built-in Jittering Frequency

ll

l Built-in PRO Pin for External Arbitrary OVP/OTP

ll

l Soft Driving for EMI Noise

ll

l High Noise Immunity

ll

l RoHS Compliant and Halogen Free

ll

Application

Ordering Information

Note :

Richtek products are :

} RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

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

R7732-00 May 2011

ll

l Switching AC/DC Adaptor and Battery Charger

ll

l Printer Power Supply

ll

l DVD Open Frame Power Supply

ll

l Set-Top Box (STB)

ll

l ATX Standby Power

ll

l TV/Monitor Standby Power

ll

l PC Peripherals

ll

l NB Adaptor

ll

Pin Configurations

(TOP VIEW)

SOT-23-6

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1

R7732

AC Mains (90V to 265V)

PRO

COMP

GND

GATE

CS

R7732

VDD

+

Vo+

Vo-

5

6

2

1

4

#

# See Application Information

3

NTC

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

F0=DNN

F2=DNN

F3=DNN

F4=DNN

F6=DNN

Marking Information

R7732GGE

F0= : Product Code

DNN : Date Code

R7732HGE

F4= : Product Code

DNN : Date Code

R7732 Version Table

Typical Application Circuit

R7732LGE

R7732RGE

F2= : Product Code

DNN : Date Code

F6= : Product Code

DNN : Date Code

R7732AGE

F3= : Product Code

DNN : Date Code

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R7732-00 May 2011

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.

Functional Pin Description

Counter

VDD

GATE

LEB

R

S

Q

SS

X3

Slope Ramp

V

COMP

V

BURH

V

BURL

PWM

Comparator

Shutdown

Logic

COMP Open

Sensing

Brownout

Sensing

Dmax

Oscillator

POR

27V

Bias &

Bandgap

UVLO

OVP

9V/14V

OLP

Constant

Power

Soft Driver

+

-

+

-

+

-

+

-

1.7V

Secondary Rectifier Short & CS Open Protection

COMP

CS

PRO

Quadruple Mode

+

-

+

-

Latch

V

L_TH

V

H_TH

V

DD

I

BIAS

Auto

Recovery

Latch

Auto

Recovery

GND

Function Block Diagram

R7732

R7732-00 May 2011

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3

R7732

Parameter Symbol Test Conditions Min Typ Max Unit

VDD Section

VDD Over Voltage Protection Level V

OVP

26 27 28 V

VDD Zener Clamp VZ 29 -- - - V

On Threshold Voltage V

TH_ON

13 14 15 V

Off Threshold Voltage V

TH_OFF

8.5 9 9.5 V

VDD Holdup Mode Entry Point V

DD_LOW

V

COMP

<1.6V -- 10 - - V

VDD Holdup Mode Ending Point V

DD_HIGH

V

COMP

<1.6V -- 10.5

- - V

Latch-off Voltage VLH -- 14 - - V

Latched Reset Voltage V

LH_RST

-- 9 - - V

Start-up Current I

DD_ST

VDD = V

TH_ON –

0.2V,

TA= -40ºC to 100ºC (N ote 5)

-- 20 35 µA

Operating Supply Current I

DD_OP

VDD= 15V, V

COMP

= 2.5V,

GATE pin open

-- 1.3 2.2 mA

Latch-off Operating Current I

DD_LH

TA= -40ºC to 100ºC (Note 5)

-- - - 40 µA

Absolute Maximum Ratings (Note 1)

l Supply Input Voltage, V

l GATE Pin -------------------------------------------------------------------------------------------------------------- −0.3V to 16.5V l PRO, COMP, CS Pin ----------------------------------------------------------------------------------------------- −0.3V to 6.5V

l I

----------------------------------------------------------------------------------------------------------------------- 10mA

DD

l Power Dissipation, P

----------------------------------------------------------------------------------------- −0.3V to 30V

DD

@ T

= 25°C

D

A

SOT-23-6-------------------------------------------------------------------------------------------------------------- 0.4W

l Package Thermal Resistance (Note 2)

SOT-23-6, θJA-------------------------------------------------------------------------------------------------------- 250°C/W

l Junction Temperature ----------------------------------------------------------------------------------------------- 150°C l Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------- 260°C l Storage Temperature Range --------------------------------------------------------------------------------------- −65°C to 150°C

l ESD Susceptibility (Note 3)

HBM (Human Body Mode) ----------------------------------------------------------------------------------------- 3kV

MM (Machine Mode) ------------------------------------------------------------------------------------------------ 250V

Recommended Operating Conditions (Note 4)

l Supply Input Voltage, V

l Junction Temperature Range -------------------------------------------------------------------------------------- −40°C to 125°C l Ambient Temperature Range -------------------------------------------------------------------------------------- −40°C to 85°C

----------------------------------------------------------------------------------------- 12V to 25V

DD

Electrical Characteristics

(V

= 15V, T

DD

= 25°C, unless otherwise specified)

A

To be continued

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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 f

OSC

R7732H 92 100 108 kHz

R7732G/R/L/A 18 22 - - kHz

Frequency Reduction Mode Minimum

Frequency

f

FR_MIN

R7732H -- 25 - - kHz

Maximum Duty Cycle DCY

MAX

70 75 80 %

PWM Frequency Jitter Range △f -- ±6

- - %

PWM Frequency Jitter Period T

JIT

For 65kHz -- 4 - - ms

Frequency Variation Versus

VDD Deviation

fDV VDD= 12V to 25V -- - - 2 %

Frequency Variation Versus

Temperature Deviation

fDT

TA= -30°C to 105°C

(Note 5)

-- - - 5 %

COMP Input Section

Open-Loop Voltage V

COMP_OP

COMP pin open 5.5 5.75

6 V

R7732G/R/L -- 56 - - ms

R7732A - - 28 - - ms COMP Open-Loop Protection Delay Time T

OLP

R7732H -- 36 - - ms

Short Circuit Current

I

ZERO

V

COMP

= 0V

-- 1.2 2.2 mA

Frequency Reduction Mode Entry Voltage

V

FR _ET

-- 3 - - V

R7732G/R/L/A -- 2.9 - - V

Frequency Reduction Mode Ending

Voltage

V

FR _ED

R7732H -- 2.8 - - V

Current-Sense Section

Initial Peak Current Limitation Offset V

CS_TH

0.68 0.7 0.72

V

Leading Edge Blanking Time T

LEB

(Note 6) 150 250 350 ns

Internal Propagation Delay Time TPD (Note 6) - - 100 - - ns

Minimum On Time T

ON_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 V

CLAMP

VDD= 25V -- 14 - - V

PRO Interface Section

Pull Low Threshold V

L_TH

0.47 0.5 0.53

V

Pull High Threshold V

H_TH

3.5 3.8 4.1 V

Internal Bias Current I

BIAS

90 100 110 µA

Pull High Sinking Current I

SINK

(Note 7) - - -- 1.2 mA

R7732-00 May 2011

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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. θ

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.

is measured in natural convection at T

JA

JEDEC 51-3 thermal measurement standard.

= 25°C on a low effective single layer thermal conductivity test board of

A

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R7732-00 May 2011

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