Datasheet

R
CS
+
ǒ
V
PL
* V
CS(os)
Ǔǒ
I
CS(2)
* I
CS(1)
Ǔ
I
CS(2)
I
P(1)
* I
CS(1)
I
P(2)
R
PL
+
ǒ
V
PL
* V
CS(os)
Ǔǒ
I
P(2)
* I
P(1)
Ǔ
I
CS(1)
I
P(2)
* I
CS(2)
I
P(1)
R
OVP1
+
1
I
OVP(line)
ǒ
N
B
N
P
V
BULK(ov)
Ǔ
R
OVP2
+ R
OVP1
ȧ
ȧ
ȡ
Ȣ
V
OVP(load)
N
B
N
S
ǒ
V
OUT(shutdown)
) V
F
Ǔ
* V
OVP(load)
ȧ
ȧ
ȣ
Ȥ
UCC28600
www.ti.com SLUS646J –NOVEMBER 2005– REVISED JULY 2011
TERMINAL COMPONENTS
TERMINAL
I/O DESCRIPTION
(1) (2) (3)
NAME NO.
(1)
CS 3 I
where:
• I
P1
is the peak primary current at low line, full load
(3)
• I
P2
is the peak primary current at high line, full load
(3)
• I
CS1
is the power limit current that is sourced at the CS pin at low-line voltage
(3)
• I
CS2
is the power limit current that is sourced at the CS pin at high-line voltage
(3)
• V
PL
is the Power Limit (PL) threshold
(2)
• V
CS(os)
is the CS offset voltage
(2)
FB 2 I Opto-isolator collector
GND 4 - Bypass capacitor to VDD, C
BP
= 0.1 μF
OUT 5 O Power MOSFET gate
OVP 7 I
where:
• I
OVP(line)
is OVP
line
current threshold
(2)
• V
BULK(ov)
is the allowed input over- voltage level
(3)
• V
OVP(load)
is OVP
load
(2)
• V
OUT(shutdown)
is the allowed output over-voltage level
(3)
• V
F
is the forward voltage of the secondary rectifier
• N
B
is the number of turns on the bias winding
(3)
• N
S
is the number of turns on the secondary windings
(3)
• N
P
is the number of turns on the primary windings
(3)
(1) Refer to Figure 1 for all reference designators in the Terminal Components Table.
(2) Refer to the Electrical Characteristics Table for constant parameters.
(3) Refer to the UCC28600 Design Calculator (TI Literature Number SLVC104) or laboratory measurements for currents, voltages and times
in the operational circuit.
Copyright © 2005–2011, Texas Instruments Incorporated 7