Datasheet

UC28023
UC28025
SLUS557F -- MARCH 2003 -- REVISED AUGUST 2010
6
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FUNCTIONAL BLOCK DIAGRAM
4
5
6
7
13
11
14
12
CLOCK
RT
CT
RAMP
VC
OUTA
OUTB
PGND
UC28025
3
EAOUT
2
1
8
15
NI
INV
SS
VCC
10GND
16 VREF
OSCILLATOR
R
PWM
Latch
+
1.25 V
+
Inhibit
1V
1.4 V
ILIM
Comparator
Shutdown
Comparator
9ILIM/SD
9V
UVLO
T
VCC Good REF GEN
Output Inhibit
VREF Good
4V
Wide Bandwidth
Error Amplifier
Toggle F/F
Internal Bias
13
14
12
VC
OUT
PGND
UC28023
11
ILIMREF
1V
(UC28025 Only)
UDG--03048
9 μA
V
IN
S
D
(UC28023
Only)