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9.2.4
TDA 16846
SYN
OTC
RZI
SRC
OCI
PCS
V
CC
GND
OTC
1
PCS
2
RZI
3
SRC
4
OCI
5
FC2
6
SYN
7
Figure 9-10 TDA 16846 pinning
Circuit Descriptions and Abbreviation List
D4
R
4
7
KSY
R
7
5 V
30 k
R
R
8
3
75 k
15 k
Control Voltage
Off Time
Comparator
Limit
2 V
+
1
-
CS1
RSTC/RSTF
Error
5 V
3.5 V
R
Amplifier
2
D2
+
3
-
D3
Buffer for
Control Voltage
4
+
+
5
-
R
On Time
1
20 k
Comparator
5 V
2
ED1
1.5 V
D1
< 25 mV
Startup
Diode
Overvoltage
Comparator
14
+
12
-
16 V
1)
The input with the lower voltage becomes operative
Figure 9-9 TDA 16846 internal block diagram
14
VCC
13
OUT
12
GND
11
PVC
10
FC1
9
REF
8
N.C./PMO
AEP02647
CL 26532120_016.eps
251002
Fold Back Point Correction
R
x 1/3
6
PVA
R
6
D5
1.5 V
G1
1
ED2
Error-
Flipflop
S
Q
R
On Time
&
Flipflop
S
Q
G2
R
I
1
Zero Crossing
Signal
Supply
Voltage
Comparator
+
-
15/8 V
Table 9-2 TDA 16846 pin definitions
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TDVD1.1E
PVC
11
Primary
Voltage
Check
1 V
3.5 V
V
CC
9
REF
8
N.C.
G4
6
FC2
+
1
-
FC2
1.2 V
Output
G3
Driver
&
13
OUT
FC1
1 V
10
FC1
AEB02648
CL 26532120_017.eps
251002
Symbol
Function
OTC
Off Time Circuit
PCS
Primary Current Simulation
RZI
Regulation and Zero Crossing Input
SRC
Soft-Start and Regulation Capacitor
OCI
Opto Coupler Input
FC2
Fault Comparator 2
SYN
Synchronization Input
N.C./PMO Not Connected (TDA16846)/
PMO (TDA16847)
REF
Reference Voltage and Current
FC1
Fault Comparator 1
PVC
Primary Voltage Check
GND
Ground
OUT
Output
VCC
Supply Voltage
9.
EN 45
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