PA78 Datasheet, PDF (4/10 Pages) Cirrus Logic – POWER OPERATIONAL AMPLIFIER

PA78
Product Innova tionFrom
Typical AppLICATION Circuit
The PA78 is ideally suited for driving continuous drop ink
jet printers, in both piezo actuation and deflection applica-
tions. The high voltage of the amplifier creates an electro-
static field on the deflection plates to control the position of
the ink droplets. The rate at which droplets can be printed
is directly related to the rate at which the amplifier can drive
the plate to a different electrostatic field strength.
1.6K
0-5V
DAC
+335V
R_C ^100K
C_C
R_CL
C_C
R_C
INK
DROPLETS
DEFLECTION
PLATE
-15V
TYPICAL PERFORMANCE GRAPHS
POWER RESPONSE
350
GAIN = -50
300
250
GAIN = -100
200
150
100
50
NO COMPENSATION
0
1
10
100
1000
FREQUENCY, (KHz)
POWER SUPPLY REJECTION
100
-V_S
80
+V_S
60
40
20
CURRENT LIMIT
160
140
120
100
80
60
+V_S
40
20
–V_S
0
0
50
100
RESISTOR VALUE (Ω)
OUTPUT VOLTAGE SWING
12
10
-V_S SIDE DROP
8
6
+V_S SIDE DROP
4
2
POWER DERATING
25
20
15
PA78PDAK78EU
10
5
0
0 25 50 75 100 125
CASE TEMPERATURE, T_C (°C)
COMMON MODE REJECTION
140
120
100
80
60
40
20
0
100
1K
10K
FREQUENCY, (Hz)
0
0
50 100 150 200
PEAK TO PEAK LOAD CURRENT (mA)
0
1 10 100 1K 10K 100K
FREQUENCY (Hz)
PA78DK SOA
1
PULSE CURVES
@ 10% DUTY CYCLE MAX
PA78EU SOA
1
PULSE CURVES
@ 10% DUTY CYCLE MAX
0.1
0.1
0.01
10
100
1000
SUPPLY TO OUTPUT DIFFERENTIAL, V_S - V_O (V)
0.01
10
100
1000
SUPPLY TO OUTPUT DIFFERENTIAL, V_S - V_O (V)
4
PA78U