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R7730 Schematic ( PDF Datasheet ) - Richtek Technology

Teilenummer R7730
Beschreibung Burst Triple-Mode PWM Flyback Controller
Hersteller Richtek Technology
Logo Richtek Technology Logo 




Gesamt 10 Seiten
R7730 Datasheet, Funktion
Preliminary
R7730
Burst Triple-Mode PWM Flyback Controller
General Description
The R7730 is a high-performance, low cost, low startup
current, current mode PWM controller with burst triple-
mode to support green mode power saving operation. The
R7730 integrates functions of soft-start, Under VoItage
Lockout (UVLO), Leading Edge Blanking (LEB), Over
Temperature Protection (OTP), internal slope
compensation. It provides the users a superior AC/DC
power application of higher efficiency, low external
component counts and lower cost solution.
To protect the external power MOSFET from being
damaged by supply over voltage, the R7730 output driver
is clamped at 12V. Furthermore, R7730 features fruitful
protections like OLP (Over Load Protection) ,OVP (Over
Voltage Protection) to eliminate the external protection
circuits and provide reliable operation. R7730 is available
in SOT-23-6 package.
Applications
z Adaptor and Battery Charger
z ATX Standby Power
z Set Top Boxes (STB)
z DVD and CD(R)
z TV/Monitor Standby Power
z PC Peripherals
Typical Application Circuit
Features
z Very Low Start-Up Current (<30uA)
z 10/14V UVLO
z Soft Start Function
z Current Mode Control
z Internal Leading-Edge Blanking
z Built-in Slope Compensation
z Burst Triple-Mode PWM for Green-Mode
z Cycle-by-Cycle Current Limiting
z Feedback Open Protection
z Output Over Voltage Protection
z Over Temperature Protection
z Over Load Protection
z Soft Driving for Reducing EMI
z High Noise Immunity
z Opto Coupler Short Protection
z RoHS Compliant and Halogne Free
AC Mains
(90V to 265V)
VO+
VO-
RT VDD
R7730
COMP
GATE
GND
CS
DS7730-00 May 2008
www.richtek.com
1






R7730 Datasheet, Funktion
R7730
Preliminary
Typical Operating Characteristics
VTH vs. Temperature
15
14 VTH_ON
13
12
11
VTH_OFF
10
9
-40 -25 -10 5 20 35 50 65 80 95 110 125
Temperature (°C)
28
26
24
22
20
18
16
14
12
10
-40
IDD-ST vs. Temperature
VDD = 13V
-15 10 35 60 85 110 135
Temperature (°C)
IDD-OP vs. Temperature
1.55
1.50
1.45
1.40
VDD = 27V
VDD = 15V
VDD = 11V
1.35
1.30
1.25
VCOMP = 2V, CL = 1nF
-40 -15 10 35 60 85 110 135
Temperature (°C)
80
79
78
77
76
75
74
73
72
71
70
-40
DMAX vs. Temperature
-20 0 20 40 60 80
Temperature (°C)
100 120
fOSC vs. Temperature
63
62 VDD = 11V
61
VDD = 27V
60
VDD = 15V
59
58
57
-40 -15 10 35 60 85 110 135
Temperature (°C)
VCOMP vs. Temperature
5.50
5.45
5.40
5.35
5.30
5.25
5.20
COMP Open Voltage
5.15
-40 -20 0 20 40 60 80 100 120
Temperature (°C)
www.richtek.com
6
DS7730-00 May 2008

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