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PDF R7732 Data sheet ( Hoja de datos )
| Número de pieza | R7732 | |
| Descripción | Enhanced Quadruple Mode PWM Flyback Controller | |
| Fabricantes | RICHPOWER MICROELECTRONICS | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de R7732 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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Preliminary
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.
Features
UVLO 9V/14V
Soft Start Function
Current Mode Control
Built-in Slope Compensation
Internal Leading Edge Blanking
PWM Quadruple Mode for Green-Mode
Excellent Green Power Performance
Cycle-by-Cycle Current Limit
Internal Over Voltage Protection
Internal Over Load Protection
Secondary Rectifier Short Protection
Opto-Coupler Short Protection
Feedback Open-Loop Protection
CS Pin Open Protection
Built-in Jittering Frequency
Built-in PRO Pin for External Arbitrary OVP/OTP
Soft Driving for EMI Noise
High Noise Immunity
RoHS Compliant and Halogen Free
R7732 Version Table
Version
Frequency
OLP Delay Time
Internal OVP(27V)
OLP & SRSP
PRO Pin High
PRO Pin Low
R7732G
65kHz
56ms
Auto Recovery
Auto Recovery
Latch
Auto Recovery
R7732R
65kHz
56ms
Auto Recovery
Auto Recovery
Auto Recovery
Latch
R7732L
65kHz
56ms
Latch
Auto Recovery
Latch
Latch
R7732A
65kHz
28ms
Latch
Latch
Latch
Latch
R7732H
100kHz
36ms
Auto Recovery
Auto Recovery
Auto Recovery
Latch
Pin Configurations
(TOP VIEW)
GATE VDD CS
www.DataSheet4U.com
65 4
23
GND COMP PRO
SOT-23-6
R7732-04P Apr 2010
Application
Switching AC/DC Adaptor and Battery Charger
Printer Power Supply
DVD Open Frame Power Supply
Set-Top Box (STB)
ATX Standby Power
TV/Monitor Standby Power
PC Peripherals
NB Adaptor
1
1 page  
Preliminary
R7732
Parameter
Symbol
Conditions
Oscillator Section
Normal PWM Frequency
fOSC
R7732G/R/L/A
R7732H
Frequency Reduction Mode Minimum
Frequency
fFR_ MIN
R7732G/R/L/A
R7732H
Maximum Duty Cycle
PWM Frequency Jitter Range
DC YMA X
△f
PWM Frequency Jitter Period
Frequency Variation Versus
VDD Deviation
Frequency Variation Versus
Temperature Deviation
COMP Input Section
TJIT For 65kHz
fDV VDD= 12V to 25V
fD T
TA= -30°C to 105°C
(Note 5)
Open-Loop Voltage
VCOMP_OP COMP pin open
R7732G/R/L
COMP Open-Loop Protection Delay Time TOLP
Short Circuit Current
IZERO
Frequency Reduction Mode Entry Voltage VFR_ET
R7732A
R7732H
VCOMP= 0V
Frequency Reduction Mode Ending
Voltage
VFR_ED
R7732G/R/L/A
R7732H
Current-Sense Section
Initial Peak Current Limitation Offset
Leading Edge Blanking Time
Internal Propagation Delay Time
Minimum On Time
GATE Section
V CS_ TH
TLEB
TPD
T O N_M IN
(Note 6)
(Note 6)
Rising Time
TR VDD= 15V, CL= 1nF
Falling Time
GATE Output Clamping Voltage
TF
V CLA MP
VDD= 15V, CL= 1nF
VDD= 25V
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Min Typ Max Unit
60 65 70
kHz
92 100 108
18 22 - -
kHz
-- 25 - -
70 75 80 %
-- ±6 - - %
-- 4 - - ms
-- -- 2 %
-- -- 5 %
5.5 5.75 6
V
-- 56 - -
-- 28 - - ms
-- 36 - -
-- 1.2 2.2 mA
-- 3 -- V
-- 2.9 - -
-- 2.8 - -
V
0.68 0.7 0.72
150 250 350
-- 100 - -
250 350 450
V
ns
ns
ns
-- 125 - -
-- 40 - -
-- 14 - -
ns
ns
V
R7732-04P Apr 2010
To be continued
5
5 Page 
Preliminary
R7732
Application Information
PWM Quadruple Mode
R7732 applies quadruple mode for improving efficiency at
light load operation. Please also refer to Figure 1 for details.
• PWM Mode : For most of load, the circuit will run at
traditional PWM current mode.
#It's highly recommended to add a resistor in parallel
with opto-coupler. To provide sufficient bias current to
make TL-431 regulate properly, 1.2kΩ resistor is
suggested.
• Frequency Reduction Mode : The frequency reduction
mode function provides linear switching frequency
reduction according to load conditions, as shown in
Figure 2. When the feedback voltage of COMP pin is
lower than VFR_ET, the switching frequency starts to
decrease. When the power supply is at light-load and
the feedback voltage of COMP pin lower than VFR_ED,
the switching frequency is clamped at fFR_MIN. This
frequency reduction mode function reduces power
consumption under light-load and no-load conditions,
and easily meets even the strictest regulations.
Freq.
fOSC
fFR_MIN
VFR_ED
VFR_ET
VCOMP
Figure 2. PWM Frequency vs. COMP Voltage
• Burst Mode : During light load, switching loss will
dominate the power efficiency calculation. This mode
is to cut switching loss. As shown in Figure 1, when
the output load gets light, feedback signal drops and
touches VBURL. PWM signal will be blanked and system
ceases to switch. After VOUT drops and feedback signal
goes back to VBURH, switching will be resumed.
Load
Normal
Operation
Frequency
Reduction
Mode
Burst
Mode
VDD
Holdup Mode
VDD
VDD_HIGH
VDD_LOW
VCOMP
VBURH
VBURL
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GATE
R7732-04P Apr 2010
Figure 1. PWM Quadruple Mode
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet R7732.PDF ] | |
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