TDA16822 [INFINEON]
Switching Regulator, Current-mode, 2.5A, 107kHz Switching Freq-Max, PDIP8, PLASTIC, DIP-8;
| 型号： | TDA16822 |
| 厂家： | 
Infineon |
| 描述： | Switching Regulator, Current-mode, 2.5A, 107kHz Switching Freq-Max, PDIP8, PLASTIC, DIP-8 开关 光电二极管 |
| 文件： | 总14页 (文件大小：229K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Datasheet, V2.0, 11 April 2000
CoolSET™-F1
TDA 16822
Off-Line Current Mode Controller
with CoolMOS™ on board
Power Conversion
N e v e r s t o p t h i n k i n g .
TDA 16822
Revision History:
2000-04-11
Datasheet
Previous Version:
Page
Subjects (major changes since last revision)
For questions on technology, delivery and prices please contact the Infineon
Technologies Offices in Germany or the Infineon Technologies Companies and
Representatives worldwide: see our webpage at http://www.infineon.com
CoolMOS™, CoolSET™ are trademarks of Infineon Technologies AG.
Edition 2000-04-11
Published by Infineon Technologies AG,
St.-Martin-Strasse 53,
D-81541 München
© Infineon Technologies AG 1999.
All Rights Reserved.
Attention please!
The information herein is given to describe certain components and shall not be considered as warranted char-
acteristics.
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 Technologies is an approved CECC manufacturer.
Information
For further information on technology, delivery terms and conditions and prices please contact your nearest Infi-
neon Technologies Office in Germany or our Infineon Technologies Representatives worldwide (see address list).
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 Technologies, 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.
TDA 16822
CoolSET™
Off-Line SMPS Current Mode Controller
with CoolMOS™ on board
Features
• PWM controller + CoolMOS™ within one
compact package
• 650V (1) avalanche rugged CoolMOS™
• Typical RDSon= 3 Ohm
• Standard DIP-8 package up to 20W
• Only few external components required
• Low start up current
P-DIP-8-6
• Improved current mode control for low load
Description
conditions
The TDA 16822 is a current mode pulse width
modulator with built in CoolMOS™ transistor. It fulfils
the requirement of minimum external control circuitry for
a flyback application.
• Input Undervoltage Lockout
• Max duty cycle 72%
• latched thermal shut down when
Tj=140°C of PWM controller
• Overload and open loop protection by
hiccup mode
• Overvoltage protection during
hiccup mode
• Overall tolerance of current limiting < ±5%
• adjustable peak current limitation via
external resistor
Current mode control means that the current through
the CoolMOS™ transistor is compared with a reference
signal derived from the output voltage of the flyback
application. The result of that comparision determines
the on-time of the CoolMOS™ transistor. The accuracy
of the switching frequency is highly sophisticated due to
temperature compensation. Furthermore overload and
open loop protection is implemented by sensing the
feedback line. This means in case of overload or open
loop the IC is working in protection mode.
• current overshoot minimization
dependent on dI/dt
Typical Application
+
Converter
DC Output
-
Snubber
RStart-up
85 ... 270 VAC
CVCC
VCC
Drain
Feedback
PWM-Controller
Power
Management
CoolMOSTM
SoftS
PWM Controller
Soft-Start Control
Current Mode
CSoft Start
FB
Protection Unit
Feedback
GND
Isense
TDA 16822
RSense
Type
Ordering Code
Package
P-DIP-8-6
TDA 16822
Q67000-A9449
Version 2.0
3
11 April 2000
TDA 16822
CoolSET™
1 Pin Configuration and Outline Dimension
(top view)
P-DIP-8-6
SoftS
FB
1
2
3
4
8
7
6
5
GND
VCC
N.C.
Isense
Drain
Drain
Figure 1
Pin
Symbol
Function
1
2
3
4
SoftS
FB
Soft-Start
Feedback
Isense
Drain
Controller Current Sense Input, CoolMOS™ Source Output
650V (1) CoolMOS™ Drain
650V (1) CoolMOS™ Drain
Not connected
5
Drain
6
7
8
N.C.
VCC
GND
Controller Supply Voltage
Controller Ground
(1): at Tj = 110°C
Version 2.0
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11 April 2000
TDA 16822
CoolSET™
2 Electrical Characteristics
2.1 Absolute Maximum Ratings
Note: Absolute maximum ratings are defined as ratings, which when being exceeded may lead to destruction
of the integrated circuit. For the same reason make sure, that any capacitor that will be connected to pin 7
(VCC) is discharged before assembling the application circuit.
Parameter
Symbol
Limit Values
Unit
Remarks
min.
max.
VCC supply voltage
VCC
-0.3
17
V
Drain Source Voltage
VDS
ID
-
-
-
650
1.5
2.5
V
A
A
Tj=110°C
Continous Drain Current
Avalanche energy, repetitive
IAR
1)
tAR limited by Tjmax
Avalanchecurrent, repetitivetAR EAR
limited by Tjmax
-
0.1
mJ
IAR=2.5A
VDD=50V
FB Voltage
VFB
VSoftS
ISense
Tj
-0.3
-0.3
-0.3
-40
-50
-
6.5
6.5
3
V
SoftS Voltage
V
ISense
V
Junction temperature
Storage temperature
Thermal resistance
150
150
90
°C
°C
K/W
TS
RthJA
P-DIP-8-6
1) Repetitive avalanche causes additional power losses that can be calculated as PAV = EAR*f
2.2 Operating Range
Note: Within the operating range the IC operates as described in the functional description.
Parameter
Symbol
Limit Values
Unit
Remarks
min.
max.
17
VCC supply voltage
Junction temperature
Ambient temperature
VCC
TJ
VCCon
-25
V
130
100
°C
°C
Controller
TA
-25
Version 2.0
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TDA 16822
CoolSET™
2.3 Characteristics
Supply Section
Note: The electrical characteristics involve the spread of values guaranteed within the specified supply voltage
and ambient temperature range TA from – 25 °C to 100 °C.Typical values represent the median values,
which are related to 25°C. If not otherwise stated, a supply voltage of VCC = 15 V is assumed.
Parameter
Symbol
Limit Values
Unit
Test Condition
min.
typ.
85
5
max.
Start up current
IVCC1
IVCC2
-
125
uA
VCC < 8.5V
Supply current with inactiv
-
7
mA
VSoftS = 0
CoolMOS™
Supply current with activ
CoolMOS™
IVCC3
-
6.5
8
mA
IFB = 0
VCC Turn-On Threshold
VCC Turn-Off Threshold
VCC Turn-On/Off Hysteresis
VCCon
VCCoff
VCCHY
13.5
8.5
4
14
9
5
14.5
9.5
6
V
V
V
Internal Voltage Reference
Parameter
Symbol
Limit Values
Unit
Test Condition
min.
6.35
-
typ.
6.55
0.2
max.
Trimmed reference voltage
Temperature coefficient VREF
VREF
6.75
-
V
Measured at pin FB
∆VREF
mV/°C
Feedback & Soft-Start
Parameter
Symbol
Limit Values
Unit
Test Condition
min.
typ.
0.8
3.7
600
50
max.
VFB operating range min level
Feedback resistance
VFB1
-
-
V
RFB
3.0
-
4.9
-
kOhm
ppm/°C
kOhm
ppm/°C
Temperature coefficient RFB
Soft-Start resistance
TK RFB
RSoft-Start
TK RSoft-Start
42
-
62
-
Temperature coefficient
RSoft-Start
600
Version 2.0
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11 April 2000
TDA 16822
CoolSET™
Oscillator
Parameter
Symbol
Limit Values
Unit
Test Condition
min.
93
-
typ.
100
max.
Frequency
fswitch
107
-
kHz
Temperature Coefficient
TK fswitch
1000
ppm/°C
Protection Unit
Parameter
Symbol
Limit Values
Unit
Test Condition
min.
typ.
max.
Over load & open loop
detection limit
VFB2
4.5
4.8
5.1
V
VSoft-Start > 5.3V
VFB > 4.8V
Activation limit of overload &
open loop detection
VSoft-Start1
VSoft-Start2
VVCC
5.0
5.3
4
5.6
V
Deactivation limit of
overvoltage detection
3.8
4.2
V
VFB < 4.8V
VCC > 16V
Overvoltage detection limit
15.3
130
16
140
16.7
150
V
VSoft-Start < 4V
VFB
> 4.8V
Thermal Shutdown
TjSD
°C
guaranted by design
Current Limiting (Current Sense CS)
Parameter
Symbol
Limit Values
Unit
Test Condition
min.
typ.
max.
1.07
CS threshold (incl. propagation Vcsth
delay time)
0.97
1.02
V
RSense=2Ohm
dI/dt<0.5A/us
(see Figure 4)
CoolMOS™ Section
Parameter
Symbol
Limit Values
Unit
Test Condition
min.
typ.
max.
Drain source breakdown
voltage
V(BR)DSS
V(BR)DS
RDSon
600
650
-
-
-
-
V
V
Tj=25°C
Tj=110°C
Drain source avalanche
breakdown voltage
-
700
-
V
Tj=25°C
Drain source
on-resistance
-
-
3
-
3.8
7
Ohm
Ohm
Tj=25°C
Tj=120°C
Zero gate voltage drain current IDSS
-
-
-
-
0.1
10
40
20
-
-
-
-
uA
pF
ns
ns
UGS=0V
Output Capacitance
Rise time
COSS
trise
UDS0=V to 480V
Fall time
tfall
Version 2.0
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TDA 16822
CoolSET™
PWM Section
Parameter
Symbol
Limit Values
Unit
Test Condition
min.
typ.
0.72
-
max.
Max duty cycle
Min duty cycle
OP gain
Dmax
Dmin
Av
0.67
0.77
0
-
VFB = 0V
3.45
3.65
4
3.95
OP gain bandwidth
OP phase margin
Bw
-
-
-
-
MHz
Φw
90
°
Version 2.0
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11 April 2000
TDA 16822
CoolSET™
Output Capacitance Coss versus
VDS
Overcurrent Shutdown, Ipk=0.5A
normative drain current
100
80
60
40
20
1, 6
1, 5
1, 4
1, 3
1, 2
1,1
1
0
40 50 60 70 80 90 10
0
0,9
0
0,2 0,4 0,6 0,8
1
1,2 1,4 1,6 1,8
2
dI/dt / A/us
VDS / V
Figure 2
Figure 4
Sw itching frequency versus
temperature
110
10 8
10 6
10 4
10 2
10 0
98
96
94
92
90
-25
0
25 50 75 100 125 150
Temp / °C
Figure 3
Version 2.0
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11 April 2000
TDA 16822
CoolSET™
3 Representative Blockdiagramm
Figure 5
Version 2.0
10
11 April 2000
TDA 16822
CoolSET™
There is a cycle by cycle current limiting realised with
the Current-Limiting Comparator. The CoolMOS™
source current is sensed via an external sense resistor
RSense. When the voltage VSense at RSense exceeds the
internal threshold voltage Vcsth the Current-Limit-
Comparator immediately turns off the gate drive.
4 Operation Description
Power Management
The undervoltage lockout monitors the external supply
voltage VCC. When VCC exceeds the on-threshold
VCCon=14V, the internal bias circuit and the voltage
reference are switched on. Additionally the error-latch
in the protection unit is reset. The internal bandgap
generates a reference voltage VREF=6.55V to supply
the internal circuits. When VCC falls below the off-
threshold VCCoff=9V the circuit is switched off. Then the
power down reset discharges the soft-start capacitor
- Propagation Delay Compensation
Concerning circuit delay there is an overshoot of the
peak current Ipk which depends on the ratio of dI/dt of
the peak current. A propagation delay compensation is
integrated to bound the tolerance of the current limiting
at +/-5% plus the tolerances of RSense
.
CSoft-Start at pin SoftS by switching on T1. During start up
This means the propagation delay time between
exceeding the current sense threshold Vcsth and
CoolMOS™ switch off is compensated within a range
of
the current consumption is only about 100uA.
Improved Current Mode
- PWM-OP
The input of the PWM-OP is applied to the external
sense resistor RSense connected to pin ISense. RSense
allows an individual adjustment of maximum
CoolMOS™ source current with very low tolerance of
maximum current threshold. RSense converts the source
current of the CoolMOS™ into a sense voltage. The
sense voltage is amplified with a gain of 3.65. Then the
amplified signal is superimposed on a virtual ramp of
0.8V. Under low load conditions the source current of
the CoolMOS™ is insufficient to built a voltage ramp for
dI
0 ≤
≤ 0.5 A / µs
dt
E.g. Ipk=0.5A at fswitch=100kHz. Without propagation
delay compensation the current sense threshold is set
to Vcsth=1V. A current ramp of dI/dt=0.4A/us and a
propagation delay time of tcsth-delay=180ns leads to an
Ipk overshoot of 12%. With the propagation delay
compensation the overshoot is only about 2%. A
current ramp of dI/dt=0.1A/us leads to an overshoot of
3% in both cases, with and without compensation. For
further information see Figure 4 on page 8.
the PWM-Comparator. To guaranted
a
proper
operation at low load the virtual ramp is the reference
signal for the PWM-Comparator. The output of the
PWM-OP is connected to the positive inputs of the
PWM-Comparator and the Soft-Start-Comparator.
Oscillator
The oscillator generates a frequency fswitch = 100kHz. A
resistor, a capacitor and a current source which
determine the frequency are integrated. The charging
and discharging current of the implemented oscillator
capacitor are internally trimmed, in order to achieve a
very high accuracy switching frequency. The ratio of
controlled charge to discharge current is adjusted to
reach a maximum PWM duty cycle Dmax=0.72.
- PWM-Comparator
The PWM-Comparator compares the sensed current
signal of the CoolMOS™ with the feedback signal VFB
. VFB is created by an external optocoupler or external
transistor in combination with the internal pullup
resistor RFB and provides the information of the
feedback circuitry. When the amplified current signal of
the CoolMOS™ exceeds the signal VFB the PWM-
Comparator switches off the CoolMOS™.
PWM-Latch
The oscillator clock output applies a set pulse to the
PWM-Latch
when
initiating
the
CoolMOS™
Soft-Start
conduction. After setting the PWM-Latch can be reset
by the PWM-OP, the Soft-Start-Comparator, the
Current-Limit-Comparator or the Error-Latch of the
Protection Unit. In case of reseting the driver is shut
down directly.
The Soft-Start is realized by the internal Soft-Start-
Comparator and pullup resistor RSoft-Start. The Soft-
Start-Comparator compares the voltage at pin SoftS at
the negative input with the ramp-signal of the PWM-OP
at the positive input. When the Soft-Start voltage VSoft-
Driver
is less than the Feedback voltage VFB the Soft-
Start
The driver-stage drives the gate of the CoolMOS™
and is optimized to minimize EMI and to provide high
circuit efficiency. This is done by reducing the switch on
slope when reaching the CoolMOS™ threshold. Thus
the leading switch on spike is minimized. When
CoolMOS™ is switched off, the falling shape of the
driver is slowed down when reaching 2V to prevent an
overshoot below ground. Furthermore the driver circuit
is designed to eliminate cross conduction of the output
stage.
Start-Comparator limits the pulse width by reseting the
driver. The Soft-Start also controls the starting phase of
the hiccup mode by the Comparators C2 and C5 in
case of overload or open loop. The Soft-Start voltage is
generated by an external capacitor CSoft-Start at pin
SoftS and the internal pullup resistor RSoft-Start by
charging the external capacitor CSoft-Start
.
Current Limiting
Version 2.0
11
11 April 2000
TDA 16822
CoolSET™
Protection Unit (Hiccup Mode)
When the IC is inactive VCC increases till 14V. Now the
Error-Latch is reset by Power Up Reset and the
external Soft-Start capacitor CSoft-Start is charged by the
internal pullup resistor RSoft-Start. During the Soft-Start
phase which ends when the voltage at pin SoftS
exceeds 6V the detection of overload and open loop by
C3 and G2 is inactive. In this way the start up phase is
not detected as an overload. But after the Soft-Start
phase the start up phase must be finished to force the
voltage at FB under the failure detection threshold of
4.8V. Figure 6 shows the hiccup mode in case of
overload or open loop with normal load.
An overload and open loop protection is integrated
within the Protection Unit. These two failure modes are
latched by an Error-Latch. Additional thermal shutdown
and undervoltage protection of VCC is latched by the
Error-Latch. In case of these failure modes the Error-
Latch is set after a delay of 5us and CoolMOS™ is shut
down. This delay prevents the Error-Latch from spikes
during normal operation mode.
-Overload & Open loop with normal load
The detection of open loop or overload is provided by
the Comparator C3, C5 and the AND-gate G2. The
detection is activated by C5 when the voltage at pin
SoftS exceeds 5.3V. Henceforth the comparator C3
can set the Error-Latch in case of open loop or overload
which leads the feedback voltage VFB to exceed the
threshold of 4.8V. After latching VCC decreases till 9V.
At this time the external Soft-Start capacitor is
discharged by the internal transistor T1 due to Power
Down Reset.
-Open loop with no load
An additional protection by the comparators C1, C2
and the AND-gate G1 is implemented. In case of open
loop and no load condition the burst phase during
hiccup mode is finished early. In this situation the
converter output voltage increases and also VCC
.
Open loop & no load condition
5us Delay
FB
Overload & Open loop/normal load
4.8V
5us Delay
FB
Failure
Detection
4.8V
Failure
Detection
t
Soft-Start Phase
SoftS
5.3V
t
SoftS
4V
Overvoltage
Detection Phase
5.3V
Soft-Start Phase
t
TBurst
Driver
THiccup
t
TBurst
Driver
THiccup
t
Overvoltage Detection
VCC
16V
14V
t
VCC
14V
9V
9V
t
Figure 7
t
An overvoltage protection is provided by Comparator
C1 in the first time till the Soft-Start voltage exceeds the
threshold of the Comparator C2 at 4V and the voltage
Figure 6
Version 2.0
12
11 April 2000
TDA 16822
CoolSET™
at FB is above 4.8V. This combination is to prevent the
normal operation mode from overvoltage protection
due to varying of VCC concerning the regulation of the
converter output. Figure 7 shows the hiccup mode for
open loop and no load condition.
-Undervoltage Protection
There is an undervoltage protection of VCC realised by
the Comparator C4. In case VCC falls below 10V the
Comparator C4 immediately turns off the gate drive by
means of the Error-Latch. This is to provide only
defined switching of the CoolMOS™.
-Thermal shutdown
Thermal shutdown is latched by the Error-Latch when
junction temperature of the pwm controller is exceeding
an internal threshold of 140°C.
Version 2.0
13
11 April 2000
Total Quality Management
Qualität hat für uns eine umfassende
Bedeutung. Wir wollen allen Ihren
Ansprüchen in der bestmöglichen
Weise gerecht werden. Es geht uns also
nicht nur um die Produktqualität –
unsere Anstrengungen gelten
gleichermaßen der Lieferqualität und
Logistik, dem Service und Support
sowie allen sonstigen Beratungs- und
Betreuungsleistungen.
Quality takes on an all encompassing
significance at Semiconductor Group.
For us it means living up to each and
every one of your demands in the best
possible way. So we are not only
concerned with product quality. We
direct our efforts equally at quality of
supply and logistics, service and
support, as well as all the other ways in
which we advise and attend to you.
Dazu gehört eine bestimmte
Part of this is the very special attitude of
our staff. Total Quality in thought and
deed, towards co-workers, suppliers
and you, our customer. Our guideline is
“do everything with zero defects”, in an
open manner that is demonstrated
beyond your immediate workplace, and
to constantly improve.
Geisteshaltung unserer Mitarbeiter.
Total Quality im Denken und Handeln
gegenüber Kollegen, Lieferanten und
Ihnen, unserem Kunden. Unsere
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Fehlern“ zu lösen – in offener
Sichtweise auch über den eigenen
Arbeitsplatz hinaus – und uns ständig
zu verbessern.
Throughout the corporation we also
think in terms of Time Optimized
Processes (top), greater speed on our
part to give you that decisive
competitive edge.
Unternehmensweit orientieren wir uns
dabei auch an „top“ (Time Optimized
Processes), um Ihnen durch größere
Schnelligkeit den entscheidenden
Wettbewerbsvorsprung zu verschaffen.
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performance through the best of quality
– you will be convinced.
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Wir werden Sie überzeugen.
h t t p : / / w w w . i n f i n e o n . c o m
Published by Infineon Technologies AG
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