ST L7905AC, L7905ACV, L7905ACV-DG, L7905ACD2T-TR, L7912AC User Manual
...
Features
■ Output current to 1.5 A
■ Output voltages of -5; -12; -15 V
■ Thermal overload protection
■ Short circuit protection
■ Output transition SOA protection
L79xxAC
2 % negative voltage regulators
Description
The L79xxAC series of three-terminal negative
regulators is available in TO-220 and D²PAK
packages and several fixed output voltages.
These regulators can provide local on-card
regulation, eliminating the distribution problems
associated with single point regulation;
furthermore, having the same voltage option as
the L78xxA positive standard series, they are
particularly suited for split power supplies. If
adequate heat sinking is provided, they can
deliver over 1.5 A output current. Although
designed primarily as fixed voltage regulators,
these devices can be used with external
components to obtain adjustable voltages and
currents.
Table 1. Device summary
TO-220
D²PAK
Order codes
Part numbers
TO-220 D²PAK
L7905AC L7905ACV L7905ACV-DG
L7912AC L7912ACV L7912ACV-DG
L7915AC L7915ACV L7915ACV-DG
1. TO-220 Dual Gauge frame.
February 2012 Doc ID 2150 Rev 13 1/22
(1)
(1)
(1)
L7905ACD2T-TR -5 V
Output
voltages
-12 V
-15 V
www.st.com
22
Contents L79xxAC
Contents
1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2/22 Doc ID 2150 Rev 13
L79xxAC Diagram
1 Diagram
Figure 1. Schematic diagram
Doc ID 2150 Rev 13 3/22
Pin configuration L79xxAC
2 Pin configuration
Figure 2. Pin connections (top view)
TO-220
D²PAK
4/22 Doc ID 2150 Rev 13
L79xxAC Maximum ratings
3 Maximum ratings
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
for V
= -5 to -18V -35
O
= -20, -24V -40
for V
O
V
T
P
T
V
I
STG
OP
DC input voltage
I
Output current Internally limited
O
Power dissipation Internally limited
D
Storage temperature range -65 to 150 °C
Operating junction temperature range 0 to 125 °C
Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
Table 3. Thermal data
Symbol Parameter D²PAK TO-220 Unit
R
R
thJC
thJA
Thermal resistance junction-case 3 5 °C/W
Thermal resistance junction-ambient 62.5 50 °C/W
Doc ID 2150 Rev 13 5/22
Application L79xxAC
4 Application
Figure 3. Application circuit
6/22 Doc ID 2150 Rev 13
L79xxAC Electrical characteristics
5 Electrical characteristics
Refer to the test circuits, TJ = 0 to 125 °C, VI = -10 V, IO = 500 mA, CI = 2.2 µF, CO = 1 µF
unless otherwise specified.
Table 4. Electrical characteristics of L7905AC
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
ΔV
ΔV
ΔI
ΔV
eN Output noise voltage B = 10Hz to 100kHz, T
Output voltage TJ = 25°C -4.9 -5 -5.1 V
O
= -5 mA to -1 A, PO ≤ 15 W
I
Output voltage
O
(1)
Line regulation
O
(1)
Load regulation
O
I
Quiescent current TJ = 25°C 3 mA
d
Quiescent current change
d
/ΔT Output voltage drift IO = 5 mA -0.4 mV/°C
O
O
= -8 to -20 V
V
I
V
= -7 to -25 V, TJ = 25°C 100
I
= -8 to -12 V, TJ = 25°C 50
V
I
= 5 mA to 1.5 A, TJ = 25°C 100
I
O
-4.8 -5 -5.2 V
IO = 250 to 750 mA, TJ = 25°C 50
I
= 5 mA to 1 A 0.5
O
VI = -8 to -25 V 1.3
= 25°C 100 µV
J
SVR Supply voltage rejection ΔVI = 10 V, f = 120Hz 54 60 dB
V
I
I
1. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be
taken into account separately. Pulse testing with low duty cycle is used.
Dropout voltage IO = 1 A, TJ = 25°C, ΔVO = 100 mV 1.4 V
d
Short circuit current 2.1 A
sc
Short circuit peak current TJ = 25°C 2.5 A
scp
mV
mV
mA
Doc ID 2150 Rev 13 7/22
Loading...