91
Integrated Circuit Diagrams
TL494CN PWM Controller
GND
V
CC
Reference
Regulator
C1
Pulse-Steering
Flip-Flop
C1
1D
DTC
CT
RT
PWM
Comparator
+
−
Error Amplifier 1
≈0.1 V
Dead-Time Control
Comparator
Oscillator
OUTPUT CTRL
(see Function T
able)
0.7 mA
E1
C2
E2
+
−
Error Amplifier 2
1IN+
1IN−
2IN+
2IN−
FEEDBACK
REF
6
5
4
1
2
16
15
3
13
8
9
11
10
12
14
7
Q1
Q2
0.7 V
FUNCTIONAL BLOCK DIAGRAM
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1IN+
1IN−
FEEDBACK
DTC
CT
RT
GND
C1
2IN+
2IN−
REF
OUTPUT CTRL
V
CC
C2
E2
E1
(TOP VIEW)
1
2
3
4
8
7
6
5
SENSE1
SENSE2
SENSE3
GND
V
DD
MR
RESET
RESET
(TOP VIEW)
_
+
_
+
_
+
R4
R2
R1
R3
Reference
Voltage
of 1.25V
RESET
Logic + T imer
Oscillator
14 kΩ
V
DD
MR
SENSE 1
SENSE 2
GND
SENSE 3
RESET
RESET
TPS3307
Functional Block Diagram
Terminal Functions
TERMINAL
NOITPIRCSED
O/I
NAME NO.
GND 4 Ground
MR
7 I Manual reset
RESET
5 O Active-low reset output
RESET 6 O Active-high reset output
SENSE1 1 I Sense voltage input 1
SENSE2 2 I Sense voltage input 2
SENSE3 3 I Sense voltage input 3
V
DD
8 Supply voltage
TPS3307-33DGNR Supervisor
TOP VIEW
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
V
CC
GND
T1
OUT
R1
IN
C2+
C1-
V+
C1+
MAX220
MAX232
MAX232A
R1
OUT
T1
IN
T2
IN
R2
OUT
R2
IN
T2
OUT
V-
C2-
DIP/SO
V+
V-
2
+10V
C1+
C1
C2
1
3
4
5
11
10
12
9
6
14
7
13
8
T1
IN
R1
OUT
T2
IN
R2
OUT
T1
OUT
R1
I
N
T2
OUT
R2
IN
+5V INPUT
C2+
-10V
C4
RS-232
OUTPUTS
RS-232
INPUTS
TTL/CMOS
INPUTS
TTL/CMOS
OUTPUTS
GND
15
5k
5k
400k
400k
+5V
+5V
+10V TO -10V
VOLTAGE INVERTER
+5V TO +10V
VOLTAGE DOUBLER
16
C3
C5
C2-
C1-
V
CC
MAX232D RS-232 Driver / Receiver
SOT−223
1
3
Pin: 1. Adjust/Ground
2. Output
3. Input
1
23
Tab
Top View
NCP1117ST33T3G 3.3V Regulator
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