CA723, CA723C
V+
UNREGULATED
INPUT
D1
6.2V
R1
500Ω
D3
R3
25kΩ
Q3
R4
1kΩ
Q7
R5
1kΩ
Q8
VC
Q14
R2
15kΩ
Q4
Q5
Q9
Q11 Q12
R12
15kΩ
Q15
VO
Q1
Q6
C1
5pF
R7
30kΩ
R6
100Ω
Q10
D2
6.2V R9
R8 300Ω
5kΩ
R10
20kΩ
D4
Q13
R11
Q16
150Ω
VREF
NON-INVERTING V- INVERTING
INPUT
INPUT
VZ
FREQUENCY
COMPENSATION
CURRENT
LIMIT
CURRENT
SENSE
FIGURE 1. EQUIVALENT SCHEMATIC DIAGRAM OF THE CA723 AND CA723C
Typical Performance Curves (CA723)
MAX JUNCTION TEMP (TJ)
THERMAL RESISTANCE =
= +150oC
150oC/W
150
QUIESCENT DISSIPATION (PQ) = 60mW
(NO HEAT SINK)
100
AMBIENT TEMPERATURE (TA) = +25oC
50
+125oC
0
0
10
20
30
40
DIFFERENTIAL INPUT - OUTPUT VOLTAGE (V)
FIGURE 2. MAX LOAD CURRENT vs DIFFERENTIAL INPUT-
OUTPUT VOLTAGE
0.05
0
-0.05
OUTPUT VOLTAGE (VO) = 5V
INPUT VOLTAGE (VI) = 12V
SHORT CIRCUIT PROTECTION
RESISTANCE (RSCP) = 10Ω
-0.1
-0.15
-55oC
AMBIENT TEMP (TA) = +25oC
+125oC
-0.2
-0.25
0
5
10 15
20
25
30
OUTPUT CURRENT (mA)
FIGURE 4. LOAD REGULATION WITH CURRENT LIMITING
OUTPUT VOLTAGE (VO) = 5V
INPUT VOLTAGE (VI) = 12V
SHORT CIRCUIT PROTECTION
0.05
RESISTANCE (RSCP) = 0
0
-0.05
-0.1
-0.15
AMBIENT TEMPERATURE
(TA) = +25oC
-55oC
+125oC
-0.2
0
20 40 60 80 100
OUTPUT CURRENT (mA)
FIGURE 3. LOAD REGULATION WITHOUT CURRENT LIMIT-
ING
OUTPUT VOLTAGE (VO) = 5V
INPUT VOLTAGE (VI) = 12V
0.1
SHORT CIRCUIT PROTECTION
RESISTANCE (RSCP) = 0
0
AMBIENT TEMPERATURE (TA) = -55oC
-0.1
0.2
+25oC
-0.3
+125oC
-0.4
0
20
40 60
80
100
OUTPUT CURRENT (mA)
FIGURE 5. LOAD REGULATION WITH CURRENT LIMITING
7-5