2 % negative voltage regulators
Document overview
- Manufacturer or author: STMICROELECTRONICS
- PDF pages: 22
Technical content
Datasheet sections
- 1 Diagram
- 2 Pin configuration
- 3 Maximum ratings
- 4 Application
- 5 Electrical characteristics
- 6 Application information
- 7 Package mechanical data
- 8 Revision history
Features
■ Output current to 1.5 A ■ Output voltages of -5; -12; -15 V ■ Thermal overload protection ■ Short circuit protection ■ Output transition SOA protection
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. D²PAKTO-220 Table 1. Device summary
1 Diagram
Figure 1. Schematic diagram
2 Pin configuration
Figure 2. Pin connections (top view)
3 Maximum ratings
Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Table 2. Absolute maximum ratings Table 3. Thermal data
4 Application
Figure 3. Application circuit
5 Electrical characteristics
Table 4. Electrical characteristics of L7905AC
- Load and line regulation are specified at cons tant junction temperature. Changes in V O due to heating effects must be
taken into account separately. Pulse testing with low duty cycle is used.
Table 5. Electrical characteristics of L7912AC
- Load and line regulation are specified at cons tant junction temperature. Changes in V O due to heating effects must be
taken into account separately. Pulse testing with low duty cycle is used.
Table 6. Electrical characteristics of L7915AC
- Load and line regulation are specified at cons tant junction temperature. Changes in V O due to heating effects must be
taken into account separately. Pulse testing with low duty cycle is used.
6 Application information
- To specify an output voltage, substitute voltage value for "XX".
- Required for stability. For value given, capacitor must be solid tantalum. If aluminium electrolytic are used,
- To improve transient response. If large capacitors are used, a high current diode from input to output
(1N4001 or similar) should be introduced to protect the device from momentary input short circuit. (*) Against potential latch-up problems. Figure 4. Fixed output regulator Figure 5. Split power supply (± 15 V - 1 A)
7 Package mechanical data
specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. Note: In spite of some difference in tolerances, the packages are compatible. Table 7. TO-220 mechanical data
Figure 8. Drawing dimension TO-220 (type STD-ST Dual Gauge)
Figure 9. Drawing dimension TO-220 (type STD-ST Single Gauge)
Figure 12. Drawing dimension D²PAK (type STD-ST)
Figure 13. Drawing dimension D²PAK (type WOOSEOK-subcon.)
ST's package suggested footprint. Table 8. D²PAK mechanical data Type STD-ST Type WOOSEOK-subcon.
Figure 14. D²PAK footprint recommended data Table 9. Footprint data
Package mechanical data L79xxAC 20/22 Doc ID 2150 Rev 13 Dim. mm. inch. A1 80 7.0 86 D 20.2 0.7 95 N6 0 2 . 362 T 14.4 0.567 Tape & reel D2PAK-P2PAK-D2PAK/A-P2PAK/A mechanical data Obsolete Product(s) - Obsolete Product(s)
8 Revision history
Table 10. Document revision history 22-Jun-2004 7 Order codes updated. 18-Feb-2008 9 Modified: Table 1 on page 1. Figure 10 and Figure 11 on page 15. 12-Nov-2010 11 Modified: R thJC value for TO-220 Table 3 on page 5. 28-Nov-2011 12 Added: order codes L7912ACV-DG and L7915ACV-DG Table 1 on page 1. 09-Feb-2012 13 Added: order code L7905ACV-DG Table 1 on page 1.