UCC28720 Datasheet, PDF (6/29 Pages) Texas Instruments – Constant-Voltage, Constant-Current Controller With Primary-Side Regulation

UCC28720
SLUSBE8 – MAY 2013
DEVICE INFORMATION
Functional Block Diagram
I_HV
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HV
VDD
GND
VS
CBC
UVLO
21 V / 8 V
POWER
& FAULT
MANAGEMENT
OC FAULT
OV FAULT
TSD/SD FAULT
LINE FAULT
4.05 V + VCVS
SAMPLER
+
E/A
5V
CONTROL
LAW
VALLEY
SWITCHING
+
V_OVP
V_CST
OV FAULT
1 / fSW
14 V
SQ
RQ
SECONDARY
TIMING
DETECT
I_VSLS
LINE
SENSE
I_VSLS
10 kΩ
CURRENT
REGULATION
LEB
+
LINE
FAULT
2.2 V / 0.80 V
I_VSLS / K_LC
OC FAULT
VCVS = ICBC x 3 kΩ
CABLE
COMPENSATION
I_CBC
28 kΩ
0 V-V_CVS(max)
+
VDD
35 mA
DRV
20 kΩ
+
CS
V_CST
+
1.5 V
UDG-13094
6
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