Fairchild RC4194 User Manual
RC4194
Dual Tracking Voltage Regulators
Features
www.fairchildsemi.com
• Simultaneously adjustable outputs with one resistor
to ±42V
• Load current – ±200 mA with 0.04% load regulation
Description
The RC/RM4194 are dual polarity tracking regulators
designed to provide balanced or unbalanced positive and
negative output voltages at currents to 200 mA.
A single external resistor adjustment can be used to change
both outputs between the limits of ±50 mV and ±42V.
These devices are designed for local “on-card” regulation,
eliminating distribution problems associated with singlepoint regulation. To simplify application the regulators
require a minimum number of external parts.
The device is available in three package types to accommodate various power requirements. The K (TO-66) power
package can dissipate up to 3W at T
14-pin dual in-line will dissipate up to 1W and the N
14-pin dual in-line will dissipate up to 625 mW.
= +25°C. The D
A
• Internal thermal shutdown at T
• External balance for ±V
unbalancing
OUT
• 3W power dissipations
Block Diagram
4194
+V
OUT
20K
Comp+
Bal
20K
Comp–
Thermal
Shutdown
= +175°C
J
100µA
Current
Source
+V
GND
R
SET
R
O
–V
S
OUT
–V
S
3R
R
65-4194-01
Rev. 1.0.0
PRODUCT SPECIFICATION RC4194
Pin Assignments
+V
-V (Case)
S
+V
OUT
Comp+
Comp-
Bal
+V
S
GND
5
4
6
7
8
9
3
2
1
R
SET
R
O
-V
OUT
65-4194-02
OUT
NC
Comp+
Bal
Comp-
NC
-V
1
2
3
4
5
6
S
7
14
13
12
11
10
9
8
65-4194-03
Absolute Maximum Ratings
(beyond which the device may be damaged)
Parameter Min Typ Max Units
Supply Voltage RC4194 ±35 V
Supply Input to Output Voltage Differential RC4194 ±35 V
Load Current PDIP 100 mA
< 50°C PDIP 468 mW
P
DTA
Operating Temperature (Tj) RC4194 0 70 °C
Storage Temperature -65 150 °C
Junction Temperature PDIP 125 °C
Lead Soldering Temperature (60 seconds) 300 °C
For TA > 50°C Derate at TO-66 Metal Can 23.81 mW/°C
Note:
1. Functional operation under any of these conditions is NOT implied.
1
RM4194 ±45 V
RM4194 ±45 V
CerDIP 150 mA
TO-66 Metal Can 250 mA
CerDIP 1042 mW
TO-66 Metal Can 2381 mW
RM4194 -55 125 °C
CerDIP 175 °C
TO-66 Metal Can 150 °C
PDIP 6.25 mW/°C
CerDIP 8.38 mW/°C
+V
NC
GND
R
SET
R
O
NC
-V
OUT
S
2
RC4194 PRODUCT SPECIFICATION
Operating Conditions
Parameter Min Typ Max Units
q
JC
Thermal Resistance CerDIP 60 °C/W
TO-66 Metal Can 7 °C/W
q
JA
Thermal Resistance PDIP 160 °C/W
CerDIP 120 °C/W
TO-66 Metal Can 42 °C/W
Electrical Characteristics
(±5 £ V
unless otherwise specified)
Parameters Test Conditions Min Typ Max Units
Line Regulation DV
Load Regulation
Output Voltage Drift With
Temperature
Positive Output V
Negative Output V
Supply Current3 (Positive) VS = ±V
Supply Current4 (Negative) VS = ±V
Supply Voltage RM4194 ±9.5 ±45 V
Output Voltage Scale Factor R
Output Voltage Range RM4194: R
Output Voltage Tracking ±0.4 ±2.0 %
Ripple Rejection F = 120 Hz, Tj = +25°C70dB
Input-Output Voltage Differential IL = 50 mA, Tj = +25°C 3.0 V
Short Circuit Current VS = ±30V, Tj = +25°C 300 mA
Output Noise Voltage CL = 4.7 mF, V
Internal Thermal Shutdown 175 °C
Notes:
1. Measured as (mA)
2. Output voltage temperature drift guaranteed by design.
3. The current drain will increase by 50mA/V
4. The specifications above apply for the given junction temperatures since pulse test conditions are used.
OUT
£ V
; –VIN £ -8V; IL = ±1mA; RM4194: -55°C £ Tj £ +125°C; RC4194: 0°C £ Tj £ +70°C
MAX
1
2
DV
OUT
æö
------------------
èø
V
OUT
§
100%´
I
L
= 0.1 V
S
IN
4194K: IL < 200 mA
4194D: IL < 100 mA
±VS = ± (V
= ±5V 0.002 0.015 %/°C
OUT
= ±5V 0.003 0.015 %/°C
OUT
MAX
OUT
, V
+ 5)V
OUT
= 0V,
0.04 0.1 %V
0.002 0.004 %V
OUT/IL
(mA)
+0.8 +2.5 mA
IL = 0 mA
, V
MAX
OUT
= 0V,
-1.8 -4.0 mA
IL = 0 mA
RC4194 ±9.5 ±35 V
= 71.5 kW, Tj = +25°C,
SET
VS = ±V
MAX
= 71.5 kW,
SET
2.38 2.5 2.62 kW/V
0.05 ±42 V
IL = 25 mA
RC4194: R
= 71.5 kW,
SET
0.05 ±42 V
IL = 25 mA
OUT
= ±15V,
250 mV
F = 10 Hz to 100 kHz
on positive side and 100mA/V
OUT
on negative side.
OUT
OUT
RMS
3
PRODUCT SPECIFICATION RC4194
Typical Performance Characteristics
150
130
110
90
70
50
Ripple Rejection (dB)
30
10
0 100 1K 10K 100K
V
OUT
= ±15V
F (Hz)
65-0201
0.06
)
L
0.05
/I
OUT
0.04
0.03
0.02
0.01
0
Load Regulation (% V
-0.01
0
20 40 60 80
100
I
(mA)
L
Tj = +125¡C
T
= +25¡C
j
120 140 160
180
65-0202
200
Figure 1. Ripple Rejection vs. Frequency Figure 2. Load Regulation vs. Load Current
)
0.8
OUT
0.6
0.4
0.2
-0.2
0
A
B
-0.4
C
-0.6
Output Voltage Tracking (% V
-60
-40
-20 0
+20 +40 +60 +80+100
+120+140
65-0203
T
(¡C)
j
A = % Tracking of V
B = T.C. for Positive Regulator
OUT
C = T.C. for Negative Regulator
Figure 3. Output Voltage Tracking vs. Temperature
4
RC4194 PRODUCT SPECIFICATION
Typical Applications
+V
4.7µF**
OUT
To Additional
Comparators
0.01µF
+V
S
+V
Comp+
S
+V
OUT
R
A
RM4194
-V
S
-V
S
R
Comp-
SET
Gnd
R
Bal
R
-V
0
OUT
B
4805
71.5K
R
0
(Typically 15 RC4805s)
-V = -5V
OUT
To Additional
Comparators
4.7µF
65-0205
0.01µF
R (k½ ) = 2.5 (-V )
O
Adjust R for -V = -5V (12.5 k )
R = R = 20 k½ (See Schematic)
F2
F1
+ V = -V
OUT
R = when +V -V
A
R = when +V -V
B
For +V = 5 when -V = -5V
OUT
R =
A
R =
B
OUT
OUT
O
R R
F1 A
OUT
R R
F2
OUT
OUT
OUT
B
W
OUT
OUT
Figure 4. Unbalanced Output Voltage — Comparator Application
R *
SC
+V
OUT
60µF**
+V
2N4905 or equiv.
m
0.1 F
2N2297 or equiv.
W
S
47
+V
GND
S
Comp+
+V
OUT
4194
W
-V
S
47
2N2297 or equiv.
R *
SC
m
0.1 F
-V
S
71.5K
Comp-
R
SET
R
0
2N914 or equiv.
*R =
**Optional usage - Not as critical as -V bypass capacitors.
0.7
SC
I
SC
O
Note: Compensation and bypass capacitor connections should be close as posibe to the 4194
Figure 5. High Output Application
-V
OUT
-V
OUT
60µF
R
0
Load regulation
10 mV @ 2.5A
R (k ) = 2.5 V
W
O
O
65-0206
5
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