D at a s h e e t , V 2 . 0 , 3 1 J u l y 2 0 0 3
PWM-QR IC
TDA 16846/16846-2
TDA 16847/16847-2
Controller for Switch Mode Power
Supplies Supporting Low Power
Standby and Power Factor
Power Management & Supply
N e v e r
s t o p
t h i n k i n g .
TDA 16846/TDA 16846-2/TDA 16847/TDA 16847
Revision History:
Current Version: 2003-07-31
Previous Version Data Sheet TDA 16846: 2000-01-14
Previous Version Data Sheet TDA 16846-2: 2002-07-30
Page
(in previous
Version)
20
Page
(in current
Version)
20
Subjects (major changes since last revision)
The data sheets for TDA 16846 and TDA 16846-2 have been
combined in this version. Some measuring values are updated:
Pin 1 basic value 1
V
1B1
and
V
1B2
slightly changed.
Pin 2 discharge current
I
2DC min
changed from 0.5 mA to 0.6 mA.
Pin 14 overvoltage
V
14OVmax
threshold changed from 17.0 V to 17.1 V.
Pin 3 delay to switch on
t
3d
slightly decreased.
Pin 4 charge current
I
4ch
and discharge current
I
4DCH
added.
Pull high resistor
R
1min
changed from 18kOhm to 15 kOhm according
to the data sheet for TDA 16846.
Pin 7 charge current
I
7 min
and upper threshold
V
7Hmin
small changed.
Pin 13 rise and fall time adapted according to
C
13
= 1nF (prev. 10 nF).
V
13aclow
slightly decreased (only TDA 16846-2, TDA 16847-2).
21
21
22
23
22
23
TDA 16846-2/TDA 16847-2:
Improvements of TDA 16846-2/TDA16847-2 compared with TDA 16846/TDA16847
Pin 5
Pin 7
Pin 11
Pin 13
Pin 14
Edition 07.03
Published by Infineon Technologies AG
St.-Martin-Strasse 53
D-81541 München
OCI
SYN
PVC
OUT
VCC
Expanded input voltage range down to zero, series resistor between
pin 5 and ground is no longer necessary.
Improved startup to prevent the transformer from saturation also in
fixed frequency and synchronized mode.
Noise-immunity improved by spike blanking.
Reduced output voltage level for off state.
Noise-immunity improved by spike blanking.
©
Infineon Technologies AG 2003
All Rights Reserved.
Attention please!
The information herein is given to describe certain components and shall not be considered as warranted characteristics.
Terms of delivery and rights to technical change reserved.
We hereby disclaim any and all warranties, including but not limited to warranties of non-infringement, regarding circuits, descriptions and
charts stated herein.
Infineon Technologiesis an approved CECC manufacturer.
Information
For further information on technology, delivery terms and conditions and prices please contact your nearest Infineon Technologies Office
in Germany or our Infineon Technologies Representatives worldwide.
Warnings
Due to technical requirements components may contain dangerous substances. For information on the types in question please contact
your nearest Infineon Technologies Office.
Infineon Technologies Components may only be used in life-support devices or systems with the express written approval of Infineon Tech-
nologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system, or to affect
the safety or effectiveness of that device or system. Life support devices or systems are intended to be implanted in the human body, or to
support and/or maintain and sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other
persons may be endangered.
Controller for Switch Mode Power Supplies
Supporting Low Power Standby and Power
Factor Correction
TDA 16846/16846-2
TDA 16847/16847-2
Bipolar IC
1
1.1
•
•
•
•
•
•
•
•
•
•
•
•
•
Overview
Features
Line Current Consumption with PFC
P-DIP-14-3
Low Power Consumption
Stable and Adjustable Standby Frequency
Very Low Start-up Current
Soft-Start for Quiet Start-up
Free usable Fault Comparators
Synchronization and Fixed Frequency Circuits
P-DSO-14-3
Over- and Undervoltage Lockout
Switch Off at Mains Undervoltage
Temporary High Power Circuit (only TDA 16847-2)
Mains Voltage Dependent Fold Back Point Correction
Continuous Frequency Reduction with Decreasing Load
Adjustable and Voltage Dependent Ringing Suppression Time
Ordering Code
Q67000-A9377
Q67000-A9378
Q67006-A9430
Q67006-A9412
Q67040-S4494
Q67040-S4496
Q67040-S4495
Q67040-S4497
Package
P-DIP-14-3
P-DIP-14-3
P-DSO-14-3
P-DSO-14-3
P-DIP-14-3
P-DIP-14-3
P-DSO-14-3
P-DSO-14-3
Type
TDA 16846
TDA 16847
TDA 16846G
TDA 16847G
TDA 16846-2
TDA 16847-2
TDA 16846-2G
TDA 16847-2G
1.2
Description
The TDA 16846-2 (this name is used in the description for all types) is optimized to
control free running or fixed frequency flyback converters with or without Power Factor
Correction (Current Pump). To provide low power consumption at light loads, this device
reduces the switching frequency in small steps with load, towards an adjustable
minimum (e. g. 20 kHz in standby mode). Additionally, the startup current is very low. To
avoid switching stress on the power devices, the power transistor is always switched on
at minimum voltage. A special circuit is implemented to avoid jitter. The device has
Version 2.0
3
31 Jul 2003
TDA 16846/16846-2
TDA 16847/16847-2
several protection functions:
V
CC
over- and undervoltage, mains undervoltage, current
limiting and 2 free usable fault comparators. Regulation can be done by using the
internal error amplifier or an opto coupler feedback (additional input). The output driver
is ideally suited for driving a power MOSFET. Fixed frequency and synchronized
operation are also possible.
The TDA 16846-2 is suited for TV-, VCR- sets, SAT receivers and other sets for
consumer electronics. It also can be used in PC monitors.
The TDA 16847-2 is identical with TDA 16846-2 but has an additional power
measurement output (pin 8) which can be used as a Temporary High Power Circuit.
Figure 1
Pin Configuration
(top view)
1.3
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Pin Definitions and Functions
Symbol
OTC
PCS
RZI
SRC
OCI
FC2
SYN
N.C./PMO
REF
FC1
PVC
GND
OUT
VCC
Function
Off Time Circuit
Primary Current Simulation
Regulation and Zero Crossing Input
Soft-Start and Regulation Capacitor
Opto Coupler Input
Fault Comparator 2
Synchronization Input
Not Connected (TDA 16846-2) / PMO (TDA 16847-2)
Reference Voltage and Current
Fault Comparator 1
Primary Voltage Check
Ground
Output
Supply Voltage
Version 2.0
4
31 Jul 2003
TDA 16846/16846-2
TDA 16847/16847-2
1.4
Pin
1
2
Short Description of the Pin Functions
Function
A parallel RC-circuit between this pin and ground determines the ringing
suppression time and the standby-frequency.
A capacitor between this pin and ground and a resistor between this pin and
the positive terminal of the primary electrolytic capacitor quantifies the max.
possible output power of the SMPS.
This is the input of the error amplifier and the zero crossing input. The output
of a voltage divider between the control winding and ground is connected to
this input. If the pulses at pin 3 exceed a 5 V threshold, the control voltage at
pin 4 is lowered.
This is the pin for the control voltage. A capacitor has to be connected
between this pin and ground. The value of this capacitor determines the
duration of the softstart and the speed of the control (primary regulation).
If an opto coupler for the control is used, its output has to be connected
between this pin and ground. The voltage divider at pin 3 has then to be
changed, so that the pulses at pin 3 are below 5 V.
Fault comparator 2: A voltage > 1.2 V at this pin stops the SMPS (v.also pin 9).
If fixed frequency mode is wanted, a parallel RC circuit has to be connected
between this pin and ground. The RC-value determines the frequency. If
synchronized mode is wanted, sync pulses have to be fed into this pin.
TDA 16846-2: Not connected. TDA 16847-2: This is the power measurement
output of the Temporary High Power Circuit. A capacitor and a RC-circuit has
to be connected between this pin and ground.
Output for the reference voltage (5 V). With a resistor between this pin and
ground the fault comparator 2 (pin 6) is enabled.
Fault comparator 1: If a voltage > 1 V is applied to this pin, the SMPS stops.
This is the input of the primary voltage check. The voltage at the anode of the
primary electrolytic capacitor has to be fed to this pin via a voltage divider. If
the voltage of this pin falls below 1 V, the SMPS is switched off. A second
function of this pin is the primary voltage dependent fold back point correction
(only active in free running mode).
Common ground.
Output signal. This pin has to be connected via a series resistor to the gate of
the power transistor.
Connection for supply voltage and startup capacitor. After startup, the supply
voltage is produced by the control winding of the transformer and rectified by
an external diode.
5
31 Jul 2003
3
4
5
6
7
8
9
10
11
12
13
14
Version 2.0
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