CHIP
TL783
HIGH-VOLTAGE ADJUSTABLE REGULATOR
SLVS036E – SEPTEMBER 1981 – REVISED FEBRUAR Y 2000
D
Output Adjustable From 1.25 V to 125 V
When Used With an External Resistor
Divider
D
700-mA Output Current
D
Full Short-Circuit, Safe-Operating-Area, and
Thermal-Shutdown Protection
D
0.001%/V Typical Input Voltage Regulation
D
0.15% Typical Output Voltage Regulation
D
76-dB Typical Ripple Rejection
D
Standard TO-220AB Package
KC PACKAGE
(TOP VIEW)
IN
OUT
ADJ
The OUT terminal is in electrical
contact with the mounting base.
TO-220AB
I
O
A
description
The TL783 is an adjustable three-terminal
high-voltage regulator with an output range of
1.25 V to 125 V and a DMOS output transistor
capable of sourcing more than 700 mA. It is
designed for use in high-voltage applications where standard bipolar regulators cannot be used. Excellent
performance specifications, superior to those of most bipolar regulators, are achieved through circuit design
and advanced layout techniques.
As a state-of-the-art regulator, the TL783 combines standard bipolar circuitry with high-voltage double-dif fused
MOS transistors on one chip to yield a device capable of withstanding voltages far higher than standard bipolar
integrated circuits. Because of its lack of secondary-breakdown and thermal-runaway characteristics usually
associated with bipolar outputs, the TL783 maintains full overload protection while operating at up to 125 V from
input to output. Other features of the device include current limiting, safe-operating-area (SOA) protection, and
thermal shutdown. Even if ADJ is inadvertently disconnected, the protection circuitry remains functional.
Only two external resistors are required to program the output voltage. An input bypass capacitor is necessary
only when the regulator is situated far from the input filter. An output capacitor , although not required, improves
transient response and protection from instantaneous output short circuits. Excellent ripple rejection can be
achieved without a bypass capacitor at the adjustment terminal.
The TL783C is characterized for operation over the virtual junction temperature range of 0°C to 125°C.
AVAILABLE OPTIONS
PACKAGED DEVICE
T
J
0°C to 125°C TL783CKC TL783Y
Chip forms are tested at 25°C.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
HEAT-SINK
MOUNTED
(KC)
FORM
(Y)
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Copyright 2000, Texas Instruments Incorporated
1
TL783
HIGH-VOLTAGE ADJUSTABLE REGULATOR
SLVS036E – SEPTEMBER 1981 – REVISED FEBRUAR Y 2000
functional block diagram
V
I
Error
Amplifier
–
+
Protection
Circuit
ADJ
absolute maximum ratings over operating temperature range (unless otherwise noted)
IN
OUT
VO[
R2
ǒ
V
ref
V
ref
Ǔ
1
)
R1
V
O
R1
R2
†
Input-to-output differential voltage, Vl – VO 125 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air, TA; case, TC; or virtual junction, TJ, temperature 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance, θ
(see Notes 1 and 2) 22°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
JA
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. Maximum power dissipation is a function of TJ(max),
ambient temperature is PD = (TJ(max) – TA)/
variations in individual device electrical characteristics and thermal resistance, the built-in thermal overload protection may be
activated at power levels slightly above or below the rated dissipation.
2. The package thermal impedance is calculated in accordance with JESD 51.
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
stg
θ
, and TA. The maximum allowable power dissipation at any allowable
θ
JA
JA
. Operating at the absolute maximum TJ of 150°C can impact reliability. Due to
recommended operating conditions
Input-to-output voltage differential, VI – V
Output current, I
Operating virtual junction temperature, T
2
O
O
J
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
MIN MAX UNIT
125 V
15 700 mA
TL783C 0 125 °C
PARAMETER
TEST CONDITIONS
†
UNIT
g
V
V
125 V
P ≤ rated dissipation
%/V
I
700 mA
T
25°C
g
I
700 mA
P ≤ rated dissipation
Peak output current
mA
TL783
HIGH-VOLTAGE ADJUSTABLE REGULATOR
SLVS036E – SEPTEMBER 1981 – REVISED FEBRUAR Y 2000
electrical characteristics at V
Input voltage
regulation
Ripple rejection ∆V
Output voltage
regulation
Output voltage change
with temperature
Output voltage
long-term drift
Output noise voltage f = 10 Hz to 10 kHz, TJ = 25°C 0.003%
Minimum
output current to
maintain regulation
ADJ input current 83 110 µA
Change in
ADJ input current
Reference voltage
(OUT to ADJ)
†
Pulse-testing techniques maintain the junction temperature as close to the ambient temperature as possible. Thermal effects must be taken into
account separately.
‡
Input voltage regulation is expressed here as the percentage change in output voltage per 1-V change at the input.
NOTE 3: Due to the dropout voltage and output current-limiting characteristics of this device, output current is limited to less than 700 mA at
‡
p
input-to-output voltage differentials of less than 25 V.
–
= 20 V to
I
O
= 10 V, VO = 10 V, f = 120 Hz 66 76 dB
I(PP)
= 15 mA to
O
= 15 mA to
O
1000 hours at TJ = 125°C, VI – VO = 125 V 0.2%
VI – VO = 125 V 15 mA
VI – VO = 25 V, t = 1 ms 1100
VI – VO = 15 V, t = 30 ms 715
VI – VO = 25 V, t = 30 ms 700 900
VI – VO = 125 V, t = 30 ms 100 250
VI – VO = 15 V to 125 V, IO = 15 mA to 700 mA, P ≤ rated dissipation 0.5 5 µA
VI – VO = 10 V to 125 V,
See Note 3
l
– V
= 25 V, I
O
,
,
,
IO = 15 mA to 700 mA, P ≤ rated dissipation,
=
J
= 0.5 A, T
O
p
°
p
= 0°C to 125°C (unless otherwise noted)
J
TJ = 25°C 0.001 0.01
TJ = 0°C to 125°C 0.004 0.02
VO ≤ 5 V 7.5 25 mV
VO ≥ 5 V 0.15% 0.5%
VO ≤ 5 V 20 70 mV
VO ≥ 5 V 0.3% 1.5%
TL783C
MIN TYP MAX
0.4%
1.2 1.27 1.3 V
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
3
TL783
PARAMETER
TEST CONDITIONS
†
UNIT
I
15 mA to 700 mA
g
I
700 mA
P ≤ rated dissipation
Peak output current
mA
HIGH-VOLTAGE ADJUSTABLE REGULATOR
SLVS036E – SEPTEMBER 1981 – REVISED FEBRUAR Y 2000
electrical characteristics at V
Input voltage
regulation
Ripple rejection ∆V
Output voltage
regulation
Output voltage change
with temperature
Output noise voltage f = 10 Hz to 10 kHz 0.003%
ADJ input current 83 µA
Change in
ADJ input current
Reference voltage
(OUT to ADJ)
†
Pulse-testing techniques maintain the junction temperature as close to the ambient temperature as possible. Thermal effects must be taken into
account separately.
‡
Input voltage regulation is expressed here as the percentage change in output voltage per 1-V change at the input.
NOTE 3: Due to the dropout voltage and output current-limiting characteristics of this device, output current is limited to less than 700 mA at
‡
p
input-to-output voltage differentials of less than 25 V.
VI – VO = 20 V to 125 V, P ≤ rated dissipation 0.001 %/V
= 10 V, VO = 10 V, f = 120 Hz 76 dB
I(PP)
=
O
= 15 mA to
O
VI – VO = 25 V, t = 1 ms 1100
VI – VO = 15 V, t = 30 ms 715
VI – VO = 25 V, t = 30 ms 900
VI – VO = 125 V, t = 30 ms 250
VI – VO = 15 V to 125 V, IO = 15 mA to 700 mA, P ≤ rated dissipation 0.5 µA
VI – VO = 10 V to 125 V,
See Note 3
l
– V
= 25 V, I
O
,
IO = 15 mA to 700 mA, P ≤ rated dissipation,
= 0.5 A, T
O
p
= 25°C (unless otherwise noted)
J
VO ≤ 5 V 7.5 mV
VO ≥ 5 V 0.15%
VO ≤ 5 V 20 mV
VO ≥ 5 V 0.3%
TL783Y
MIN TYP MAX
0.4%
1.27 V
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL783
HIGH-VOLTAGE ADJUSTABLE REGULATOR
SLVS036E – SEPTEMBER 1981 – REVISED FEBRUAR Y 2000
TYPICAL CHARACTERISTICS
OUTPUT CURRENT LIMIT
vs
INPUT-TO-OUTPUT VOLTAGE DIFFERENTIAL
2
tw = 1 ms
1.8
1.6
1.4
1.2
1
0.8
0.6
Output Current Limit – A
0.4
0.2
0
VI – VO – Input-to-Output Voltage Differential – V
TC = 25°C
TC = 125°C
250 50 75 100 125
Figure 1
TC = 0°C
OUTPUT CURRENT LIMIT
vs
INPUT-TO-OUTPUT VOLTAGE DIFFERENTIAL
2
tw = 30 ms
1.8
1.6
1.4
1.2
1
0.8
0.6
Output Current Limit – A
0.4
0.2
0
TC = 125°C
0 25 50 75 100
VI – VO – Input-to-Output Voltage Differential – V
TC = 0°C
TC = 25°C
Figure 2
125
OUTPUT CURRENT LIMIT
vs
TIME
1.6
1.4
1.2
1
0.8
0.6
Output Current Limit – A
0.4
0.2
0
0
10 20 30 40
Time – ms
VI – VO = 25 V
TC = 25°C
120
100
80
60
V
40
Ripple Rejection – dB
I(AV)
∆V
I(PP)
IO = 100 mA
f = 120 Hz
20
Co = 0
TJ = 25°C
0
0 102030405060708090
Figure 3
RIPPLE REJECTION
vs
OUTPUT VOLTAGE
– VO = 25 V
= 10 V
100
VO – Output Voltage – V
Figure 4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
5
TL783
HIGH-VOLTAGE ADJUSTABLE REGULATOR
SLVS036E – SEPTEMBER 1981 – REVISED FEBRUAR Y 2000
TYPICAL CHARACTERISTICS
RIPPLE REJECTION
vs
OUTPUT CURRENT
100
80
60
V
= 25 V
Ripple Rejection – dB
I(AV)
40
∆V
= 10 V
I(PP)
VO = 10 V
f = 120 Hz
Co = 0
20
TJ = 25°C
0
0 100 200 300 400 500 600 700 800
IO – Output Current – mA
Figure 5
†
100
90
80
70
60
50
40
Ripple Rejection – dB
30
V
= 25 V
I(AV)
∆V
= 10 V
VO = 10 V
IO = 500 mA
TJ = 25°C
0
0.01
I(PP)
0.1 1 10 100 1000
20
10
RIPPLE REJECTION
vs
FREQUENCY
Co = 10 µF
Co = 0
f – Frequency – kHz
Figure 6
OUTPUT IMPEDANCE
vs
FREQUENCY
2
10
VI = 35 V
VO = 10 V
1
10
IO = 500 mA
TJ = 25°C
1
–1
10
–2
10
– Output Impedance – ΩZ
o
–3
10
–4
10
10
1
10
2
3
10
f – Frequency – kHz
10
4
10
5
10
6
10
7
1.30
VI = 20 V
IO = 15 mA
1.29
1.28
1.27
1.26
1.25
– Reference Voltage – V
ref
V
1.24
1.23
1.22
–75 –50 –25 0 25 50 75 100 125 150
Figure 7
REFERENCE VOLTAGE
vs
VIRTUAL JUNCTION TEMPERATURE
175
TJ – Virtual Junction Temperature – °C
Figure 8
†
Data at high and low temperatures are applicable only within the recommended operating free-air temperature ranges of the various devices.
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL783
HIGH-VOLTAGE ADJUSTABLE REGULATOR
SLVS036E – SEPTEMBER 1981 – REVISED FEBRUAR Y 2000
TYPICAL CHARACTERISTICS
INPUT CURRENT AT ADJ
VIRTUAL JUNCTION TEMPERATURE
90
VI = 25 V
VO = V
ref
IO = 500 mA
88
A
86
84
ADJ Input Current – µ
82
80
0255075
TJ – Virtual Junction Temperature – °C
Figure 9
vs
100 125
DROPOUT VOLTAGE
VIRTUAL JUNCTION TEMPERATURE
25
∆VO = 100 mV
20
15
IO = 700 mA
10
Dropout Voltage – V
IO = 600 mA
IO = 500 mA
IO = 250 mA
IO = 100 mA
5
IO = 15 mA
0
–75 –50 –25 0 25 50
TJ – Virtual Junction Temperature – °C
Figure 10
vs
75 100 125
OUTPUT VOLTAGE DEVIATION
vs
VIRTUAL JUNCTION TEMPERATURE
0
VI = 25 V
VO = 5 V
IO = 15 mA to 700 mA
–0.1
–0.2
–0.3
– Output Voltage Deviation – %
O
–0.4
∆V
–0.5
0 25 50 75 100 125 150
TJ – Virtual Junction Temperature – °C
Figure 11
OUTPUT CURRENT
†
vs
INPUT VOLTAGE
12
10
8
6
4
– Output Current – mA
O
I
2
0
0255075
VI – Input Voltage – V
†
This is the minimum current required to maintain voltage regulation.
TC = 0°C
TC = 25°C
TC = 125°C
100 125
Figure 12
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
7
TL783
HIGH-VOLTAGE ADJUSTABLE REGULATOR
SLVS036E – SEPTEMBER 1981 – REVISED FEBRUAR Y 2000
TYPICAL CHARACTERISTICS
0.4
0.2
0
– Output Voltage Deviation – VV
–0.2
O
∆
1
0.5
0
Change in Input Voltage – V
LINE TRANSIENT RESPONSE
TJ = 25°C
Co = 0
Co = 10 µF
01 2 34
Time – µs
Figure 13
LOAD TRANSIENT RESPONSE
6
4
2
0
–2
– Output Voltage Deviation – V
–4
O
V
∆
–6
0.8
0.6
0.4
0.2
0
– Output Current – AI
0 40 80 120 160 200 240
O
VI = 35 V
VO = 10 V
Co = 1 µF
TJ = 25°C
Time – µs
Figure 14
DESIGN CONSIDERATIONS
The internal reference (see functional block diagram) generates 1.25 V nominal (V
voltage is developed across R1 and causes a constant current to flow through R1 and the programming resistor R2,
giving an output voltage of:
V
V
O =
(1 + R2/R1) + l
ref
I(ADJ)
(R2)
or
VO ≈ V
(1 + R2/R1)
ref
The TL783 was designed to minimize the input current at ADJ and maintain consistency over line and load variations,
thereby minimizing the associated (R2) error term.
To maintain I
at a low level, all quiescent operating current is returned to the output terminal. This quiescent
I(ADJ)
current must be sunk by the external load and is the minimum load current necessary to prevent the output from rising.
The recommended R1 value of 82 Ω provides a minimum load current of 15 mA. Larger values can be used when
the input-to-output differential voltage is less than 125 V (see the output-current curve in Figure 14) or when the load
sinks some portion of the minimum current.
) between OUT and ADJ. This
ref
8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
HIGH-VOLTAGE ADJUSTABLE REGULATOR
SLVS036E – SEPTEMBER 1981 – REVISED FEBRUAR Y 2000
DESIGN CONSIDERATIONS
bypass capacitors
The TL783 regulator is stable without bypass capacitors; however, any regulator becomes unstable with certain
values of output capacitance if an input capacitor is not used. Therefore, the use of input bypassing is
recommended whenever the regulator is located more than four inches from the power-supply filter capacitor.
A 1-µF tantalum or aluminum electrolytic capacitor usually is sufficient.
Adjustment-terminal capacitors are not recommended for use on the TL783 because they can seriously
degrade load transient response as well as create a need for extra protection circuitry . Excellent ripple rejection
presently is achieved without this added capacitor.
Due to the relatively low gain of the MOS output stage, output voltage dropout may occur under large load
transient conditions. The addition of an output bypass capacitor greatly enhances load transient response and
prevents dropout. For most applications, it is recommended that an output bypass capacitor be used, with a
minimum value of:
TL783
Co (µF) = 15/V
Larger values provide proportionally better transient-response characteristics.
O
protection circuitry
The TL783 regulator includes built-in protection circuits capable of guarding the device against most overload
conditions encountered in normal operation. These protective features are current limiting, safe-operating-area
protection, and thermal shutdown. These circuits protect the device under occasional fault conditions only.
Continuous operation in the current limit or thermal shutdown mode is not recommended.
The internal protection circuits of the TL783 protect the device up to maximum-rated VI as long as certain
precautions are taken. If V
occur, which can destroy the regulator. These are usually caused by lead inductance and bypass capacitors
causing a ringing voltage on the input. In addition, when rise times in excess of 10 V/ns are applied to the input,
a parasitic npn transistor in parallel with the DMOS output can be turned on, causing the device to fail. If the
device is operated over 50 V and the input is switched on rather than ramped on, a low-Q capacitor, such as
tantalum or aluminum electrolytic should be used rather than ceramic, paper, or plastic bypass capacitors. A
Q factor of 0.015 or greater usually provides adequate damping to suppress ringing. Normally, no problems
occur if the input voltage is allowed to ramp upward through the action of an ac line rectifier and filter network.
Similarly , when an instantaneous short circuit is applied to the output, both ringing and excessive fall times can
result. A tantalum or aluminum electrolytic bypass capacitor is recommended to eliminate this problem.
However, if a large output capacitor is used and the input is shorted, addition of a protection diode may be
necessary to prevent capacitor discharge through the regulator. The amount of discharge current delivered is
dependent on output voltage, size of capacitor, and fall time of V
only for capacitance values greater than:
C
(µF) = 3 x 104/(VO)
o
Care always should be taken to prevent insertion of regulators into a socket with power on. Power should be
turned off before removing or inserting regulators.
is instantaneously switched on, transients exceeding maximum input ratings may
l
. A protective diode (see Figure 17) is required
l
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
9
TL783
HIGH-VOLTAGE ADJUSTABLE REGULATOR
SLVS036E – SEPTEMBER 1981 – REVISED FEBRUAR Y 2000
DESIGN CONSIDERATIONS
TL783
V
I
Figure 15. Regulator With Protective Diode
load regulation
The current-set resistor (R1) should be located close to the regulator output terminal rather than near the load.
This eliminates long line drops from being amplified, through the action of R1 and R2, to degrade load regulation.
To provide remote ground sensing, R2 should be near the load ground.
IN
ADJ
OUT V
R1
C
o
R2
O
TL783
V
I
IN OUT
ADJ
V
O
R1
R
line
R2
R
L
Figure 16. Regulator With Current-Set Resistor
10
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
VI = 125 V
1 µF
TL783
HIGH-VOLTAGE ADJUSTABLE REGULATOR
SLVS036E – SEPTEMBER 1981 – REVISED FEBRUAR Y 2000
APPLICATION INFORMATION
VI = 145 to 200 V
7.5 kΩ, 1 W
TIP150
R2
TL783
IN OUT
ADJ
+
†
R2
0 to 8 kΩ
VO+
R1
82 Ω
ǒ
V
ref
1
+
)
R1
10 µF
Ǔ
120 V , 1.5 W
IN
0.1 µF
TL783
ADJ
R2
8.2 kΩ, 2W
OUT
R1
82 Ω
125 V
+
10 µF
†
Needed if device is more than 4 inches from filter capacitor
Figure 17. 1.25-V to 115-V Adjustable Regulator
VI = 70 to 125 V
10 Ω
1 kΩ
TL783
IN
OUT
ADJ
3.3 kΩ, 1W
10 kΩ
TIP30C
82 Ω
TIPL762
VO = 50 V
at 0.5 A
+
50 µF
Figure 18. 125-V Short-Circuit-Protected
Off-Line Regulator
125 V
1 Ω
10 Ω
TIPL762
V
O
+
50 µF
TL783
IN
ADJ
1 kΩ
10 kΩ
OUT
R1
82 Ω
R2
R2
ǒ
+
V
ref
Ǔ
1
)
R1
Figure 19. 50-V Regulator With Current Boost
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Figure 20. Adjustable Regulator
With Current Boost and Current Limit
11
TL783
HIGH-VOLTAGE ADJUSTABLE REGULATOR
SLVS036E – SEPTEMBER 1981 – REVISED FEBRUAR Y 2000
APPLICATION INFORMATION
V
I
Load
V
ref
I
+
R
TL783
IN
OUT
ADJ
R
Figure 21. Current-Sinking Regulator
V
CC
TL783
1 µF
V +
–
IN
OUT
ADJ
82 Ω
R2
OUTPUT
V
I
I
+
TL783
V
ref
R
IN
OUT
ADJ
R
Load
1 µF
Figure 22. Current-Sourcing Regulator
VI = 90 V
TL783
IN
OUT
ADJ
TL783
IN
OUT
ADJ
6.25 Ω
82 Ω
48 V
+
V –
TL081
V
OFFSET
R2
ǒ
+
V
ref
Ǔ
I
)
82
INPUT
Figure 23. High-Voltage Unity-Gain Offset Amplifier
12
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
3.9 kΩ
Figure 24. 48-V, 200-mA Float Charger
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accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty . Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
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Copyright 2000, Texas Instruments Incorporated
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