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R7731A Datasheet(PDF) 5 Page - Richtek Technology Corporation

Part # R7731A
Description  Burst Triple Mode PWM Flyback Controller
Download  14 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

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R7731A
5
R7731A-10 August 2011
www.richtek.com
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 the 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.
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Frequency Jittering Range
--
±6
--
%
PWM Frequency Jitter Period
TJIT
For 65 kHz
--
4
--
ms
Maximum Duty Cycle
DMAX
70
75
80
%
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
VCOMP_OP COMP pin open
5.2
5.6
6
V
COMP Open-loop Protection Delay
Cycles
TOLP
RT = 100kΩ
--
60
--
ms
Short Circuit Current
IZERO
VCOMP = 0V
--
1.2
2.2
mA
Current-Sense Section
Initial Peak Current Limit Offset
VCSTH
0.8
0.85
0.9
V
Leading Edge Blanking Time
TLEB
--
420
520
ns
Propagation Delay Time
TPD
--
100
--
ns
GATE Section
Rising Time
TR
VDD = 15V, CL = 1nF
--
250
350
ns
Falling Time
TF
VDD = 15V, CL = 1nF
--
150
250
ns
Gate Output Clamping Voltage
VCLAMP
VDD = 22V
--
12
--
V
Over Temperature Protection
TOTP
140
--
--
°C
OTP Hysteresis
TOTP_HYS
--
30
--
°C


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