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 |
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R7732
Marking Information
R7732GGE |
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R7732LGE |
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R7732AGE |
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F0=DNN |
DNN : Date Code |
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DNN : Date Code |
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F3=DNN |
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F4= : Product Code |
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F4=DNN |
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DNN : Date Code |
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R7732 Version Table
Version |
R7732G |
R7732R |
R7732L |
R7732A |
R7732H |
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Frequency |
65kHz |
65kHz |
65kHz |
65kHz |
100kHz |
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OLP Delay Time |
56ms |
56ms |
56ms |
28ms |
36ms |
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Internal OVP(27V) |
Auto Recovery |
Auto Recovery |
Latch |
Latch |
Auto Recovery |
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OLP & SRSP |
Auto Recovery |
Auto Recovery |
Auto Recovery |
Latch |
Auto Recovery |
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PRO Pin High |
Latch |
Auto Recovery |
Latch |
Latch |
Auto Recovery |
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PRO Pin Low |
Auto Recovery |
Latch |
Latch |
Latch |
Latch |
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Typical Application Circuit
AC Mains |
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(90V to 265V) |
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5 |
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3 |
PRO |
VDD |
GATE 6 |
2 |
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R7732 |
CS 4 |
COMP |
GND |
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NTC |
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1 |
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Vo+ |
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Vo- |
# |
# See Application Information
www.richtek.com |
R7732-00 May 2011 |
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R7732
Functional Pin Description
Pin No. |
Pin Name |
Pin Function |
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1 |
GND |
Ground. |
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2 |
COMP |
Voltage Feedback Pin. By connecting an opto-coupler to close control loop and achieve |
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3 |
PRO |
For External Arbitrary OVP or OTP. |
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4 |
CS |
Primary Current Sense Pin. |
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5 |
VDD |
Power Supply Pin. |
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6 |
GATE |
Gate Drive Output to drive the external MOSFET. |
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Function Block Diagram
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VDD |
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VL_TH |
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+ |
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Auto |
Auto |
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IBIAS |
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- |
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Recovery |
Recovery |
OVP |
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PRO |
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+ |
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27V |
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+ |
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- |
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Latch |
Latch |
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- |
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VH_TH |
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Secondary Rectifier Short |
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1.7V |
- |
& CS Open Protection |
Shutdown |
POR |
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+ |
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Logic |
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UVLO |
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Brownout |
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+ |
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9V/14V |
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Sensing |
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- |
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Counter |
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COMP Open |
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Bias & |
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Sensing |
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Bandgap |
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OLP |
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Oscillator |
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Constant |
SS |
Dmax |
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Power |
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S |
Soft Driver |
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Q |
GATE |
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COMP |
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- |
R |
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+ |
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PWM |
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Slope |
Comparator |
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CS |
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Ramp |
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VCOMP |
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Quadruple Mode |
VBURL |
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VBURH |
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LEB |
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X3 |
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VDD |
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GND |
R7732-00 |
May 2011 |
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www.richtek.com |
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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 |
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SOT-23-6 -------------------------------------------------------------------------------------------------------------- |
0.4W |
λ Package Thermal Resistance (Note 2) |
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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) |
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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 |
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VDD Section |
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VDD Over Voltage Protection Level |
VOVP |
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26 |
27 |
28 |
V |
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VDD Zener Clamp |
VZ |
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29 |
-- |
-- |
V |
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On Threshold Voltage |
VTH_ON |
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13 |
14 |
15 |
V |
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Off Threshold Voltage |
VTH_OFF |
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8.5 |
9 |
9.5 |
V |
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VDD Holdup Mode Entry Point |
VDD_LOW |
VCOMP <1.6V |
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-- |
10 |
-- |
V |
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VDD Holdup Mode Ending Point |
VDD_HIGH |
VCOMP <1.6V |
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10.5 |
-- |
V |
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Latch-off Voltage |
VLH |
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-- |
14 |
-- |
V |
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Latched Reset Voltage |
VLH_RST |
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-- |
9 |
-- |
V |
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Start-up Current |
IDD_ST |
VDD = VTH_ON – 0.2V, |
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20 |
35 |
μA |
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TA= -40ºC to 100ºC |
(Note 5) |
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Operating Supply Current |
IDD_OP |
VDD= 15V, VCOMP = 2.5V, |
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1.3 |
2.2 |
mA |
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GATE pin open |
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Latch-off Operating Current |
IDD_LH |
TA= -40ºC to 100ºC |
(Note 5) |
-- |
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40 |
μA |
To be continued
www.richtek.com |
R7732-00 May 2011 |
4 |
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R7732
Parameter |
Symbol |
Test Conditions |
Min |
Typ |
Max |
Unit |
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Oscillator Section |
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R7732G/R/L/A |
60 |
65 |
70 |
kHz |
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Normal PWM Frequency |
fOSC |
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R7732H |
92 |
100 |
108 |
kHz |
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Frequency Reduction Mode Minimum |
fFR_MIN |
R7732G/R/L/A |
18 |
22 |
- - |
kHz |
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Frequency |
R7732H |
-- |
25 |
- - |
kHz |
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Maximum Duty Cycle |
DCYMAX |
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70 |
75 |
80 |
% |
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PWM Frequency Jitter Range |
f |
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-- |
±6 |
- - |
% |
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PWM Frequency Jitter Period |
TJIT |
For 65kHz |
-- |
4 |
- - |
ms |
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Frequency Variation Versus |
fDV |
VDD= 12V to 25V |
-- |
-- |
2 |
% |
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VDD Deviation |
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Frequency Variation Versus |
fDT |
TA= -30°C to 105°C |
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-- |
5 |
% |
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Temperature Deviation |
(Note 5) |
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COMP Input Section |
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Open-Loop Voltage |
VCOMP_OP |
COMP pin open |
5.5 |
5.75 |
6 |
V |
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R7732G/R/L |
-- |
56 |
- - |
ms |
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COMP Open-Loop Protection Delay Time |
TOLP |
R7732A |
-- |
28 |
- - |
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R7732H |
-- |
36 |
- - |
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Short Circuit Current |
IZERO |
VCOMP= 0V |
-- |
1.2 |
2.2 |
mA |
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Frequency Reduction Mode Entry Voltage |
VFR_ET |
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3 |
- - |
V |
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Frequency Reduction Mode Ending |
VFR_ED |
R7732G/R/L/A |
-- |
2.9 |
- - |
V |
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Voltage |
R7732H |
-- |
2.8 |
- - |
V |
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Current-Sense Section |
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Initial Peak Current Limitation Offset |
VCS_TH |
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0.68 |
0.7 |
0.72 |
V |
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Leading Edge Blanking Time |
TLEB |
(Note 6) |
150 |
250 |
350 |
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Internal Propagation Delay Time |
TPD |
(Note 6) |
-- |
100 |
- - |
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Minimum On Time |
TON_MIN |
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250 |
350 |
450 |
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GATE Section |
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Rising Time |
TR |
VDD= 15V, CL= 1nF |
-- |
125 |
- - |
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Falling Time |
TF |
VDD= 15V, CL= 1nF |
-- |
40 |
- - |
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GATE Output Clamping Voltage |
VCLAMP |
VDD= 25V |
-- |
14 |
- - |
V |
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PRO Interface Section |
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Pull Low Threshold |
VL_TH |
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0.47 |
0.5 |
0.53 |
V |
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Pull High Threshold |
VH_TH |
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3.5 |
3.8 |
4.1 |
V |
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Internal Bias Current |
IBIAS |
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90 |
100 |
110 |
μA |
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Pull High Sinking Current |
ISINK |
(Note 7) |
-- |
-- |
1.2 |
mA |
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R7732-00 May 2011 |
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www.richtek.com |
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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. 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.
www.richtek.com |
R7732-00 May 2011 |
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