GAMMA GM317TA3R

GM317
3-TERMINAL 1.5A
ADJUSTABLE REGULATOR
Description
Features
The GM317 is an adjustable 3-terminal positive
voltage regulator capable of supplying in excess
of 1.5 A over an output voltage range of 1.2 V to
37 V. This voltage regulator is exceptionally
easy to use and requires only two external
resistors to set the output voltage. Further, it
employs internal current limiting, thermal
shutdown and safe area compensation, making
it essentially blow out proof.
GM317 offers full overload protection. Included
on the chip current limit, thermal overload
protection, and safe-area protection. Normally,
no capacitors is needed unless the device is
situated far from the input filter capacitors in
which case an input bypass is needed. An
optional output capacitor can added to improve
transient response.
„
Output current up to 1.5A
„
Output Voltages 1.2V to 37V
„
Input Regulation typ. 0.01%
„
Output Regulation typ. 0.1%
„
Peak Output Current Constant over
Temperature Range of Regulator
„
Available in TO-220, TO-263, TO252 and
SOT223 Packages
„
Ripple Rejection Typically 80dB
„
Direct replacements for LM317
Applications
„
„
„
„
Voltage Regulators
Power Supplies
Current Regulators
„
„
„
Switching Regulators
Current Limiter
Constant Current Battery Charger
Current Limited Charger
Typical Application Circuit
VIN
VIN
GM317
VOUT
ADJ
CIN*
0.1µF
IADJ
VOUT
R1
240Ω
CO**
1µF
* CIN is required if regulator is located an appreciable distance from power supply filter.
**CO is not needed for stability, however, it improve transient response.
VOUT= 1.25V (1+
R2
) + IADJR2
R1
Since IADJ is controlled to less than 100µA, the error associated with this term is negligible
in most applications.
GM317V1.01
R2
1
GM317
3-TERMINAL 1.5A
ADJUSTABLE REGULATOR
Marking Information and Pin Configurations (Top View)
TO 252
(D-PAK)
TO 220
TO 263
(D2-PAK)
GM317
AYWW
SOT223
GM317
AYWW
GM317
AYWW
3. VIN
2. VOUT
1. Adj
3. VIN
2. VOUT
1. Adj
GM317
AYWW
3. VIN
2. VOUT
1. Adj
3. VIN
2. VOUT
1. Adj
A: Assembly / Test site code
Y: Year
WW: Week
Ordering Information
Ordering Number
Package
Shipping
GM317TA3T
TO-263
50 Units/Tube
GM317TA3R
TO-263
800 Units / Tape & Reel
GM317TB3T
TO-220
50 Units/Tube
TO-252
80 Units/Tube
GM317TC3R
TO-252
2,500 Units / Tape & Reel
GM317ST3T
SOT-223
80 Units/Tube
GM317ST3R
SOT-223
2,500 Units / Tape & Reel
GM317V1.01
GM317TC3T
2
VOUT
Adj
GM317
3-TERMINAL 1.5A
ADJUSTABLE REGULATOR
Absolute Maximum Ratings
PARAMETER
RATINGS
UNITS
Input to Output Differential Voltage, VI – VO
40
V
Continuous Total Dissipation at 25°C Free-air Temperature
2
Continuous Total Dissipation at (or bellow) 25°C Cast Temperature
15
W
Operating Junction Temperature
TJ
- 40 to 125
°C
Storage Temperature
Tstg
- 60 to 150
°C
260
°C
Lead Temperature 1.6mm (1/6 inch) from case for 10 seconds
Recommended Operating Conditions
PARAMETER
Min
Max
Unit
Output Current, IO
10
1500
mA
Operating Virtual Junction Temperature, TJ
0
125
°C
Block Diagram
VIN
310
220
120
5.6K
6.3V
13K
170
12.4K
125K
6.7K
5pF
6.8K
5.1K
190
3.6K
160
6.3V
200
105
30pF
5.8K
6.3V
12K
510
30pF
2.4K
110
4.0
2.5K
VOUT
ADJ
GM317V1.01
31
3
GM317
3-TERMINAL 1.5A
ADJUSTABLE REGULATOR
Electrical Characteristics (Unless otherwise noted, VI - VO = 5V and IO= 0.5A. TJ = Full
Range, unless otherwise noted)
Parameter
Line Regulation (note 2)
Symbol
∆VOI
Ripple Rejection Ratio
Test Condition
Typ
Max
3V ≤ VIN – VOUT ≤ 40V, TJ = 25°C
0.01
0.04
3V ≤ VIN – VOUT ≤ 40V,
0.02
0.07
VOUT = 10V, f = 120Hz
65
VOUT = 10V, f = 120Hz, 10µF
capacitor between ADJ and GND
10mA ≤ IOUT ≤ 1.5A,
TJ = 25°C
Load regulation (note 3)
∆VOL
10mA ≤ IOUT ≤ 1.2A
Output Voltage Change with
Temperature
∆VOT
mV
VO > 5V
0.1
0.5
%
VO ≤ 5V
20
70
mV
VO > 5V
0.3
1.5
%
Full Temperature Range
10Hz ≤ f ≤ 10KHz, TJ = 25°C
Minimum Load Current
VIN – VOUT ≤ 40V
Reference Voltage
dB
80
25
Output Noise Voltage
%
0.3
3V ≤ VIN – VOUT ≤ 40V
10mA ≤ IOUT ≤ 1.2A
3V ≤ VIN – VOUT ≤ 40V,
10mA ≤ IOUT ≤ 1.5A, P ≤ 15W
1
0.003
IADJ
∆IADJ
%/V
5
TJ = 125 OC, VIN – VOUT = 40V,
after 1000hr
Adjustment Pin Current
Change
66
Unit
VO ≤ 5V
Long Term Stability
(Note 4)
Adjustment Pin Current
Min
1.2
%
%
3.5
10
mA
50
100
µA
0.2
5.0
µA
1.25
1.3
V
Note 1: All characteristics are measured with a 0.1µF capacitor across the input and a 1µF capacitor across the output.
Note 2: Input regulation is expressed here as the percentage change in output voltage per 1V change at the input.
Note 3: Pulse testing techniques are used to maintain the junction temperature as close to the ambient temperature as possible.
Thermal effects must be taken into account separately.
GM317V1.01
Note 4: Since long-term drift cannot be measured on the individual devices prior to shipment, this specification is not intended to
be a guarantee or warranty. It is an engineering estimate of the average drift to be expected from lot to lot.
4
GM317
3-TERMINAL 1.5A
ADJUSTABLE REGULATOR
Application Information
„
Basic Circuit Operation
The GM317 is a 3- terminal floating regulator. In operation, the GM317 develops and maintains a nominal 1.25V
reference (VREF) between its output and adjustment terminals. This reference voltage is converted to a
programming current flow through R2 to ground.
The regulated output voltage is given by:
VOUT
VIN
GM317
VREF
Adjust
R1
IPROG
R2
VOUT = VREF (1 +
) + IADJ R2
R1
IADJ
R2
VREF = 1.25V typical
Basic Circuit Configuration
Since the current from the adjustment terminal (IADJ) represents an error term in the equation, the GM317was
designed to control IADJ to less than 100µA and keep it constant. To do this, all quiescent operating current is
returned to the output terminal. This imposes the requirement for a minimum load current. If the load current is
less than this minimum, the output voltage will rise.
Since the GM317 is a floating regulator, it is only the voltage differential across the circuit which is important to
performance, and operation at high voltages with respect to ground is possible.
„
Load Regulation
The GM317 is capable of providing extremely good load regulation, but a few precautions are needed to obtain
maximum performance. For best performance, the programming resistor R1 should be connected as close to
the regulator as possible to minimize line drops which effectively appear in series with the reference, thereby
degrading regulation. The ground end of R2 can be returned near the load ground to provide remote ground
sensing and improve load regulation.
„
External Capacitors
A 0.1µF disc or 1.0µF tantalum input bypass capacitor CIN is recommended to reduce the sensitivity to input line
impedance. The adjustment terminal may be bypassed to ground to improve ripple rejection. This capacitor CADJ
prevents ripple from being amplified as the output voltage is increased. A 10µF capacitor should improve ripple
rejection about 15 dB at 120Hz in a 10V application.
Although the GM317 is stable with no output capacitance, like any feedback circuit, certain values of external
capacitance can cause excessive ringing. An output capacitance CO in the form of a 1.0µF tantalum or 25µF
aluminum electrolytic capacitor on the output swamps this effect and insures stability.
„
Protection Diodes
The figure below shows the GM317 with the recommended protection diodes for output for output voltage in
excess of 25V or high capacitance values (CO > 25µF, CADJ > 10µF). Diode D1 prevents CO from discharging
thru the IC during an input short circuit. Diode D2 protects against capacitor CADJ discharging through the IC
during an output short circuit. The combination of diodes D1 and D2 prevents CADJ from discharging through the
IC during an input short circuit.
D1
1N4002
VOUT
VIN
GM317
R1
CIN
CO
D2
1N4002
Adjust
R2
CADJ
GM317V1.01
When external capacitors are used with any IC regulator, it is sometimes necessary to add protection diodes to
prevent the capacitors from discharging through low current points into the regulator.
5
GM317
3-TERMINAL 1.5A
ADJUSTABLE REGULATOR
4.0
IL = 0.5A
0
-0.2
IL = 1.5A
-0.4
-0.6
VI = 15V
VO= 10V
-0.8
-1.0
3.0
TJ = 25˚C
2.0
-55˚C
1.0
0
-50 -25 0 25 50 75 100125 150
0
1A
1.5
500mA
1.0
200mA
20mA
-50-25 0 25 50 75 100125150
TJ, Junction Temperature (°C)
Figure 4. Dropout Voltage
100
RR, Ripple Rejection (dB)
30
40
IL = 500mA
VIN = 15V
VOUT = 10V
TJ = 25˚C
80
60
40
20
CLOAD = 10µF
Without CADJ
0
100 1.0K 10K 100K1.0M 10M
VIN – VOUT, Input – Output Voltage
differential (Vdc)
Figure 7. Ripple Rejection vs.
Frequency
70
60
50
40
30
20
10
0
0
25
50
72
100
125
100
4.5
TJ = -55˚C
4.0
3.5
3.0
2.5
25˚C
2.0
150˚C
1.5
1.0
0.5
0
90
80
Ambient Temperature (°C)
Figure 3. Adjustment Pin Current
vs. Temperature
0
10
20
30
40
VIN – VOUT, Input – Output Voltage
differential (Vdc)
Figure 5. Minimum Operating current
RR, Ripple Rejection (dB)
IL = 1.5A
0
GM317V1.01
20
5.0
∆VOUT = 100mV
2.5
0
10
VIN – VOUT, Input – Output Voltage
differential (Vdc)
Figure 2. Current Limit
IB, Quiescent Current (mA)
VIN, - VOUT, Input - Output
Voltage Differential (Vdc)
3.0
150˚C
Adjustment Pin Current (µA)
0.2
TJ, Junction Temperature (°C)
Figure 1. Load Regulation
6
100
0.4
IOUT, output Current (A)
VOUT, output Voltage Change (%)
Typical Performance Characteristics
CADJ = 10µF
80
Without CADJ
60
40
VIN – VOUT = 5V
20 IL = 500mA
0
0
f = 120Hz
TJ = 25˚C
5.0 10 15
20 30
35
25
40
VOUT, Output Voltage
Figure 6. Ripple Rejection vs.
Output Voltage
GM317
3-TERMINAL 1.5A
ADJUSTABLE REGULATOR
Package Outline Dimensions – SOT223
0.248 - 0.264
(6.30 - 6.71)
0.010 - 0.014
(0.25 - 0.36)
0.116 - 0.124
(2.95 - 3.15)
0.130 - 0.146
(3.30 - 3.71)
0.264 - 0.287
(6.71 - 7.29)
10°- 16
°
0.071
(1.8)
MAX
0.0008 - 0.0040
(0.0203 - 0.1016)
10 - 16 °
0.012
(0.31)
0.090
(2.29)
NOM
0.033 - 0.041
(0.84 - 1.04)
°
MIN
0.025 - 0.033
(0.64 - 0.84)
0.81
(4.6)NOM
10°
MAX
NOM
Package Outline Dimensions – TO263
0.390 - 0.415
(9.906 - 10.541)
0.105 - 0.180
(4.191 - 4.572)
0.060
(1.524)
TYP
0.045 - 0.055
(1.143 - 1.397)
15
TYP
0.330 - 0.370
(8.382 - 9.398)
0.059
(1.499)
TYP
0.143 + 0.012
0.143 - 0.002
(3.632 + 0305)
(3.362 - 0.508)
0.050 +/- 0.012
(1.270 +/- 0.305)
0.090 - 0.110
(2.286 - 2.794)
0.050
(1.270)
0.013 - 0.023
(0.330 - 0.584)
GM317V1.01
0.020 - 0.039
(0.510 - 0.990)
7
GM317
3-TERMINAL 1.5A
ADJUSTABLE REGULATOR
Package Outline Dimensions – TO252
0.205 – 0.215
(5.210 – 5.460)
0.039 – 0.050
(1.020 – 1.270)
0.055 – 0.080
(1.400 – 2.030)
0.018 – 0.023
(0.460 – 0.580)
SEATING PLAN
0.370 – 0.410
(9.400 – 10.420)
0.210 – 0.228
(5.330 – 5.800)
0.090
(2.285)
TYP
GM317V1.01
0.180
(4.570)
TYP
8
0.045 – 0.060
(1.150 – 1.520)
0.030 – 0.045
(0.760 – 1.140)
0.020
(0.510)
MIN
0.018 – 0.023
(0.460 – 0.580)
GM317
3-TERMINAL 1.5A
ADJUSTABLE REGULATOR
Ordering Number
GM 317
Circuit
Type
T
Package
Type
Shipping Type
TA3:
TB3:
TC3:
ST3:
T: Tube
R: Tape & Reel
TO263
TO220
TO252
SOT223
GM317V1.01
APM Gamma
Micro
TA3
8
10
6
9