GS-R4840NV
36 W NEGATIVE SWITCHING REGULATOR
December 1993
1/3
Type
V
in
V
out
I
out
GS-R4840NV
-40 to -60 V
-22 to -60 V
-600 mA
FEATURES
Digital input for voltage selection
Short-circuit protection
Overvoltage protection
Thermal protection
Softstart
Fault signal indication output
High efficiency (>80%)
DESCRIPTION
The GS-R4840NV is a negative input, negative
output switching voltage regulator that provides up
to 36W output power without input-output isolation.
The output voltage is programmable by input logic
signals that allow 64 steps (6 bit) of regulated
output, from -22 to -60V.
ELECTRICAL CHARACTERISTICS (T
amb
= 25
C unless otherwise specified)
Symbol
Parameter
Test Conditions
Min
Typ
Max
Unit
Vi
Input Voltage
Vo = -22 to -60V
Io = -10 to -600mA
-40
-48
-60
V
Vir
Input Ripple Voltage
Vi = -40 to -60V
Io = -600mA
20
mVpp
Vo
Output Voltage
Vi = -40 to -60V
Io = -10 to -600mA
-22
-60
V
Vor
Output Ripple
Voltage
Vo = -22 to -60V
Io = -600mA
4
10
mVpp
Voov
Output Overvoltage
Protection
Vi = -40 to -60V
Io = -10 to -600mA
Vo+5%
Vo+10%
V
Io
Output Current
Vi = -40 to -60V
Vo = -22 to -60V
-10
-600
mA
Iol
Current Limit
Vi = -40 to -60V
Overload Condition
-900
mA
Iosc
Output Average
Short Circ. Current
Vi = -40 to -60V
-80
mA
fs
Switching Frequency
100
kHz
Efficiency
Vi = -48V
Io = -600mA
Vo = -48V
80
82
%
Rth
Thermal Resistance
Case to Ambient
4
C/W
Tcop
Operating Case
Temperature Range
0
+85
C
Tstg
Storage
Temperature Range
-20
+105
C
2/3
Package F. Dimensions in mm. (inches)
CONNECTION DIAGRAM AND MECHANICAL DATA
PIN DESCRIPTION
Pin
Function
Description
1
-Vin
Negative input voltage.
2
Inhibit/
Enable
Remote Inhibit/Enable logically compatible with CMOS or open collector TTL. The
converter is OFF (Inhibit) when this pin is unconnected or the voltage applied is in the
range of 2 to 5V (referred to GND). The converter is ON (Enable) for a control voltage in
the range of 0 to 0.8V maximum.
3
GND IN
Return for input voltage source and +5V logic supply voltage. Internally connected to pin
15.
4
+5V IN
+5V logic supply voltage. Maximum voltage must not exceed 7V.
5
DB0
Data bit 0 (LSB).
6
DB1
Data bit 1.
7
DB2
Data bit 2.
8
DB3
Data bit 3.
9
DB4
Data bit 4.
10
DB5
Data bit 5 (MSB).
11
CS
Chip select. An active low input control which is the device enable input terminal.
12
WR
Write control. An active low control which enables the microprocessor to write data to the
DAC.
13
-Vout
Negative output voltage.
14
FAULT
FAULT indication output (referred to GND). The FAULT signal is high (TTL compatible
level) when:
- the INHIBIT is ON (high)
- an output overload is present (Vo < 18V typ.)
- an overtemperature is present
- an overvoltage is present (Vo > Vo+5%)
15
GND OUT
Return for output voltage source. Internally connected to pin 3.
Note: Case internally connected to Ground.
GS-R4840NV
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USER NOTES
Digital Information
The GS-R4840NV accepts 6 bit binary at the data
inputs DB0 to DB5. Data are transferred when CS
is low and during the rising edge of WR signal.
Figure 1 - Signals Timing.
t
DS
and t
DH
have to be 100ns and 50ns minimum
respectively (see fig. 1).
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specification mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express
written approval of SGS-THOMSON Microelectronics.
1994 SGS-THOMSON Microelectronics All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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GS-R4840NV
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