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Preliminary
PT4432
1.0A Line Driver
DESCRIPTION
FEATURES
The PT4432 is a power line driver designed to drive
the output current, up to 1A, into an isolation
transformer or simple coil coupling to the loads.
Power supply of PT4432 is a single-sided voltage from
6V to 24V. To work as a two stage amplifier, the 1st
stage can be configured as a Variable Gain Amplifier
(VGA) with gain range 0dB to 21dB. The 2 nd stage is
configured as a unit gain amplifier to provide current
driving capability. In addition, PT4432 also include the
Under Voltage Lock-Out (UVLO), Over Voltage LockOut (OVLO), Thermal Shut Down (TSD) and Average
Current Detection (ACD) function.






Supply Voltage: 6V to 24V.
Flexible 4th-Order Filtering.
Under Voltage Protection Set by RUV Resistor.
Over Voltage Protection Set to +24V Internally.
Thermal Shutdown at 160oC.
Current Sense Amplifier with Sensing Resistor
over VCCH/VCC
 Average Current Collected with CCSA Capacitor.
 Automatic Gain Control Timing Set by CAGC
Capacitor.
 QFN20 Package with Exposed Thermal Pad.
APPLICATIONS
 Power Line Communication Driver in AMM and
AMR Metering System
 Valve, Actuator, and Motor Driver
 Audio
BLOCK DIAGRAM
LVSS
LVDD
2
20
0
1
19
9
CAGC
1
18
8
TSD
CCSA
1
17
7
1
16
6
EN
1
Current
Detection
Voltage
Detection
Temperature
Detection
15
RUV
VCOM
2
Automatic
Gain Control
Reference
Voltage
Reference
Current
14
AmpB+
AmpA+
3
13
AmpB-
AmpA-
4
12
VCCH
11
VCC
RG1
Current
Mirror
Rstrip
AmpA
Out
5
ROUT
RG2
Current
Sense Amp
6
VEE
7
8
9
1
10
0
VEE AmpB Out AmpB Out VCC
Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, No. 233-1, Baociao Rd., Sindian Dist., New Taipei City 23145, Taiwan
PT4432
TSD
APPLICATION CIRCUIT
3V~5V
LVDD
CAGC
20
19
LVSS
18
CCSA
17
LVDD CAGC
TSD
16
CCSA
EN
RUV
1
EN
RUV
2
VCOM
AmpB+
14
3
AmpA+
AmpB-
13
4
AmpA-
VCCH
12
5
AmpA Out
VCC
11
15
Cbypass
Signal
Input
PT4432
RINA
Cac1
timing calculation
=====
rc oscillator period t
gain down t_dn=4*t
gain up t_up=32*t
oneshot duration
=2048*t
PLC transmission info
=====
packet length: 52ms
preamble length: 6ms
t_oneshot < Preamble
6V~24V
VCCH
RCSA
VEE
VEE
6
7
AmpB
Out
8
9
VCC
10
VCC
R4
Cac3
Cac2
RLOAD
R5
BILL OF MATERIALS
Part
RINA
RCSA
RUV
R4
R5
RLOAD
CCSA
CAGC
Cbypass, Cac1,
Cac2
Cac3
PRE1.0
2
Value
10K
1
20K
10K
10K
10
680p
51p
Unit
Ω
Ω
Ω
Ω
Ω
Ω
F
F
100n
F
10μ
F
August 2015
PT4432
ORDER INFORMATION
Valid Part Number
Package Type
Top Code
PT4432
20 Pins, QFN
PT4432
PIN CONFIGURATION
LVSS LVDD CAGC TSD CCSA
Exposed
Pad
16
17
18
19
20
EN
1
15
RUV
VCOM
2
14
AmpB+
AmpA+
3
13
AmpB-
AmpA-
4
12
VCCH
AmpA Out
5
11
VCC
PT4432
10
9
8
7
6
VEE
AmpB Out VCC
PIN DESCRIPTION
Pin Name
EN
VCOM
AmpA+
Description
Pin No.
Enable/Shutdown Input (High = Enable)
1
1/2 VCC
2
IN
Non Inverting Input of Op Amp A
3
IN
IN
PWR
Inverting Input of Op Amp A
4
AmpA Out
OUT
Output of Op Amp A
5
VEE
GND
Ground of Analog Circuit
6, 7
AmpB Out
OUT
Output of Op Amp B
8, 9
VCC
PWR
Power Supply of Analog Circuit; Low Input of Current Sense
Amplifier(CSA)
10
VCC
PWR
Power Supply of Analog Circuit
11
VCCH
PWR
Power Supply of Analog Circuit; High Input of Current Sense
Amplifier(CSA)
12
AmpB-
IN
Inverting Input of Op Amp B
13
AmpB+
IN
Non Inverting Input of Op Amp B
14
RUV
IN
Under Voltage Detector Setting
15
AmpA-
PRE1.0
I/O
CCSA
OUT
Capacitor for Averaging the CSA Output Voltage
16
TSD
OUT
Thermal Shutdown Flag
(High to indicate junction Temperature >= 160oC)
17
CAGC
OUT
Capacitor of the RC Oscillator to Set the AGC Timing
18
LVDD
PWR
Power Supply of Digital Circuit
19
LVSS
GND
Ground of Digital Circuit
20
Exposed Pad
GND
For Thermal Dissipation
21
3
August 2015
PT4432
FUNCTION DESCRIPTION
MAXIMUM CURRENT LIMIT
The maximum peak output stage current of PT4432 is set to 1A. If the output stage current exceed the set current limit,
a feedback signal will be sent to adjust the output stage bias voltage stay below the set current limit value.
UNDER VOLTAGE PROTECTION
In PT4432, pin RUV with 100KΩ pull-up resistor to VCC. By placing a resistor over RUV to ground, the resistor-divided
voltage will be compared to the internal-generated reference voltage.
When the voltage over RUV is higher than the reference (1V) voltage, PT4432 will stay in normal operation.
When the voltage over RUV is lower than the reference voltage, OpAmp A and OpAmp B will be shut down to prevent
the improper operation.
OVER VOLTAGE PROTECTION
The over voltage protection of PT4432 is set to +24V.
If VCC is larger than +24V, OpAmp A/OpAmp B will be shut down and a 25mA current will leak from VCC to ground for
preventing the build-up voltage over pin VCC. The build-up voltage is generated from power line interference and it can
reach 2 times VCC to lock PT4432 in OVP condition.
THERMAL SHUTDOWN
When the internal junction temperature approximate 160℃, the PT4432 will shift into shutdown mode to prevent damage.
Meanwhile, flag signal over TSD (pin 17) will go into logic High state.
When its temperature cools down to approximately 120℃, the PT4431 will shift back into its normal operation mode and
the TSD flag signal will go down logic low state. The temperature of hysteresis window is about 40℃.
AVERAGE CURRENT DETECTION
PT4432 has a build-in CSA (Current Sense Amplifier) resemble MAXIM MAX4173. By placing the sensing resistor over
pin VCCH and VCC, the detected current signal is translated to voltage signal and shown over pin CCSA (pin 16). A
capacitor is placed over pin CCSA to perform the average function. The averaged signal will be compared with the internal
reference voltage (1V) to perform gain control (for details, please refer to section: AUTOMATICAL GAIN CONTROL).
If VCCH and VCC is connected together, the CSA and AGC function will be bypassed.
AUTOMATICAL GAIN CONTROL
PT4432 1st stage amplifier can be configured as a 3-bit PGA(Programmable Gain Amplifier) to adjust its gain
automatically with detected current. The feedback resistor between AmpA- and AmpA Out is varied in the range between
10K and 113K. By connecting a 10KΩ resistor externally over pin AmpA-, it can work as an inverting amplifier in 8 stages
of gain: 0dB/3dB/6dB/9dB/12dB/15dB/18dB/21dB. When the EN signal is applied from low to high, PT4432 will load with
default gain and perform the gain adjustment over a one-shot duration.
In the one-shot duration(ONESHOT)
a. If average current detection voltage is smaller than 1V, the chip will increase its gain with a timing UP.When it reach
to its maximum value, the gain will stop from increasing and remain steady.
b. If average current detection voltage is larger than 1V, the chip will reduce its gain with a timing DOWN. .When it reach
to its minimum value, the gain will stop from reducing and remain steady.
c. PT4432 will stop gain adjustment after the oneshot duration to avoid gain fluctuation during a payload transmission
The calculations of ONESHOT/UP/DOWN are as follows,
 is internal RC oscillator period which controlled by CAGC
ONESHOT is oneshot duration = 2048 * , UP is gain up timing = 32 * , DOWN is gain down timing = 4 * 
PRE1.0
4
August 2015
PT4432
ABSOLUTE MAXIMUM RATINGS
VEE = LVSS = 0 V
Parameter
Symbol
VCCH/VCC
LVDD
Rating
30
6
Unit
V
V
TJ
160
℃
Operating Temperature Range
TOPR
–40 to 125
℃
Storage Temperature Range
TSTG
–40 to 150
℃
Soldering Temperature Range
TSLD
255
℃
Soldering Time Range
tSLD
10
s
Analog Supply Voltage
Logic Supply Voltage
Maximum Junction Temperature
(Operating Range -40oC to 125oC)
RECOMMENDED OPERATING CONDITIONS
VEE = LVSS = 0 V
Parameter
Symbol
Analog Supply Voltage
Logic Supply Voltage
VCCH/VCC
LVDD
Min.
6
3
Operating Temperature
TA
-40
PRE1.0
5
Rating
Typ.
3.3
Max.
24
5
50
125
Unit
V
V
℃
August 2015
PT4432
ELECTRICAL CHARACTERISTICS
Nominal conditions: VCC = 12.0 V, VEE = LVSS = 0 V, LVDD=3.3 V, EN = “High”, TA = +27℃
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Best Operation Condition
8
6
15
12
15
8
24
V
Power Supply
Analog Supply Voltage
VCC
Less Performance THD> 5%
OVP triggered,
IC don’t burn-out
Logic Supply Voltage
Consumption DC Current
Total DC Current (stand-by mode)
LVDD
ICC
Istandby
EN = “High”
EN = “Low”
24
30
3
15
200
3.3
20
5
24
500
V
mA
μA
+/- 1
-50
0.1
+/- 3
+/-10
-45
1
mV
dB
nA
Vcc-3
70
V
dB
75
MHz
V/μS
0.35
%
1
1
V
V
pF
25
-55
1
45
-45
10
mV
dB
nA
0.1
40
Vcc-3
50
V
dB
120
MHz
V/μS
0.45
%
Input Operational Amplifier (OP Amp A)
Offset Voltage
Input Offset Voltage
Offset vs. Power Supply
Input Bias Current
Input Voltage Range
Common Mode Voltage Range
Open Loop Gain
Frequency Response
Full Power Bandwidth
Slew Rate
Vos
PSRR
Ib
Vcm
RL=500 Ω
BW FP
SR
Total Harmonic Distortion + Noise
THD+N
Voltage Output Swing from Rail @
100KHz
VOH
VOL
CLOAD
Capacitive Load Drive
VCC=12V, VEE=0V
VCC=12V, VEE=0V
G=5, Vout=9Vpp
G=1, RL=50Ω, Vout=8Vpp,
f=100KHz, Cin=220μF,
Cout=330μF
Output
[email protected]/2
0
50
0.2
45
60
1
0.1
0.1
0.1
0.3
0.3
100
Output Operational Amplifier (OP Amp B)
Offset Voltage
Input Offset Voltage
Offset vs. Power Supply
Input Bias Current
Input Voltage Range
Common Mode Voltage Range
Open Loop Gain
Frequency Response
Full Power Bandwidth
Slew Rate
Total Harmonic Distortion + Noise
PRE1.0
Vos
PSRR
Ib
VCC=12V, VEE=0V
VCC=12V, VEE=0V
Vcm
RL=5Ω
BW FP
SR
THD+N
G=2, Vout=9Vpp
G=1, RL=50Ω, Vout=7Vpp,
f=100KHz, Cin=220μF,
Cout=330μF
6
0.4
70
0.1
1
August 2015
PT4432
Parameter
Symbol
Conditions
Min.
Iout=1A to GND
1
1
Typ.
Max.
Unit
2
2
V
V
pF
24
V
mV
V/V
Output
Voltage Output Swing from Rail
@ 100KHz
VOH
VOL
CLOAD
Capacitive Load Drive
Current Sense Amplifier
Common-mode input range
VCMR
Full-scale sense voltage
VSENSE
Gain
GCSA
Detection Circuit
Pull-up Resistor at pin RUV
RUV
Output Resistor at pin CCSA
ROUTCSA
Feedback Resistor between AmpARFPGA
/AmpA Out
PRE1.0
500
6
VSENSE = VCCH - VCC
Refer to VCC
CCSA to VEE
7
500
7
40K
55K
Ω
Ω
10K
113K
Ω
100K
August 2015
PT4432
PACKAGE INFORMATION
20 Pins, QFN
Symbol
A
A1
A3
b
D
E
e
D2
E2
L
Dimensions
Nom.
0.85
0.02
0.203 REF.
0.25
4.00 BSC.
4.00 BSC.
0.50 BSC.
2.50
2.50
0.45
Min.
0.80
0.00
0.20
2.40
2.40
0.35
Max.
0.90
0.05
0.30
2.55
2.55
0.55
Notes:
1. Refer to JEDEC MO-220VGGD-1
2. Unit: mm
PRE1.0
8
August 2015
PT4432
APPENDIX A: EVALUATION BOARD INFORMATION
 Schematic
Notice: Place 0Ω resistor over VCCH/VCC to stop the ACD and AGC function
 PCB Layout(not scaled)
PRE1.0
9
August 2015
PT4432
Bill of Materials
PRE1.0
Component
Value
Unit
Component
Value
Unit
R1
10k
Ω
C1
100
F
R2
-
Ω
C2
-
F
R3
10k
Ω
C3
-
F
R4
10k
Ω
C4
-
F
R5
-
Ω
C5
-
F
R6
1.1
Ω
C6
20p
F
R7
-
Ω
C7
100n
F
R8
-
Ω
C8
100n
F
R9
10k
Ω
C9
10μ
F
R10
-
Ω
C10
-
F
R11
0
Ω
C11
-
F
R12
0
Ω
C12
100n
F
R13
-
Ω
C13
100n
F
R14
0
Ω
C14
100n
F
R15
-
Ω
C15
-
F
R16
-
Ω
C16
-
F
R17
0
Ω
C17
-
F
R18
0
Ω
C18
4.7μ
F
R19
-
Ω
C19
-
F
R20
-
Ω
C20
51p
F
R21
-
Ω
C21
2700p
F
R22
-
Ω
D1
-
Diode
R23
-
Ω
D2
-
Diode
R24
-
Ω
D3
-
TVS
R25
0
Ω
L1
0
H
R26
0
Ω
R27
1k
Ω
R28
-
Ω
R29
-
Ω
10
August 2015
PT4432
IMPORTANT NOTICE
Princeton Technology Corporation (PTC) reserves the right to make corrections, modifications, enhancements,
improvements, and other changes to its products and to discontinue any product without notice at any time.
PTC cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a PTC product. No
circuit patent licenses are implied.
Princeton Technology Corp.
2F, 233-1, Baociao Road,
Sindian Dist., New Taipei City 23145, Taiwan
Tel: 886-2-66296288
Fax: 886-2-29174598
http://www.princeton.com.tw
PRE1.0
11
August 2015