Preliminary PT4431 1.0A Line Driver DESCRIPTION FEATURES The PT4431 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. Its input is a single-supply operational amplifier with specifications at 6V to 24V can be configured as a unity gain buffer or a 4-pole low pass filter. For precaution, this device provides one thermal shutdown flag to indicate if the internal junction temperature has exceeded 160 ℃ .Its Maximum current limit can be set by a single resistor, i.e. R_Limit. Supply Voltage: 6V to 24V Flexible 4th-Order Filtering Maximum Current Limit Set by One Resistor Low Voltage Protection Set by External Resistors Thermal Shutdown at 160℃ Diagnostic Flags Level Shifted to LVDD to Simplify Interface with External MCU - Thermal Shutdown Flag 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 GND LVDD lowV TSD NC 20 19 18 17 16 TSD EN 15 1 Vbg NC disable opA & opB Vcom 2 14 R_Limit AmpA+ 3 13 AmpB+ AmpA- 4 OpA AmpA Out 12 AmpB- 11 Vee OpB 5 6 7 Vcc Vcc 9 10 AmpB Out Vee 8 Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, No. 233-1, Baociao Rd., Sindian Dist., New Taipei City 23145, Taiwan PT4431 APPLICATION CIRCUIT Vcc R6 20 19 GND EN 1 EN 2 Vcom LVDD TSD 3V~5.5V R7 18 17 16 lowV TSD NC NC 15 R_Limit 14 R5 ½ Vcc C1 3 AmpA+ 4 AmpA- 5 AmpA Out PT4431 AmpB+ 13 ½ Vcc R1 Signal in AmpB- 12 Vee 11 R2 Vcc Vcc 6 7 AmpB Out 8 9 Vee 10 6V~12V R4 R3 C2 Signal out BILL OF MATERIALS Part R1 R2 R3 R4 R5 R6 R7 C1 C2 PRE1.0 Value 4.7K 56K 10K 10K 5.6K 100K 100K 100n 10μ 2 Unit Ω Ω Ω Ω Ω Ω Ω F F August 2015 PT4431 ORDER INFORMATION Valid Part Number Package Type Top Code PT4431 20 Pins, QFN PT4431 PIN CONFIGURATION 20 19 18 17 16 1 15 2 14 PT4431 3 13 4 12 5 11 6 7 8 9 10 PIN DESCRIPTION Pin Name EN Vcom I/O IN IN/OUT Pin No. Enable/Shutdown Input (High = Enable) 1 1/2 Vcc 2 AmpA+ IN Positive (+) Input of Op Amp A 3 AmpA- IN Negative (-) Input of Op Amp A 4 5 AmpA Out OUT Output of Op Amp A Vcc PWR Power Supply of Analog Circuit 6, 7 AmpB Out OUT Output of Op Amp B 8, 9 Vee GND Ground reference for Analog Circuit 10, 11 AmpB- IN Negative (-) Input of Op Amp B 12 AmpB+ IN Positive (+) Input of Op Amp B 13 R_Limit IN Op Amp B Maximum Current Limit Set Resistor 14 NC PRE1.0 Description 15, 16 Reserved Thermal Shutdown Flag (High : Indicating junction Temperature is higher than 160oC) 17 Voltage Setting for Low Voltage Protection 18 PWR Power Supply of Digital Circuit 19 GND GND Ground reference for Digital Circuit 20 Exposed Pad GND Ground reference for Thermal Dissipation 21 TSD OUT LowV IN LVDD 3 August 2015 PT4431 FUNCTION DESCRIPTION Maximum Current Limit The output stage current is mirrored and detected internally to compare with the current limit value set by the resistor over R_Limit (pin 14). 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. The relationship between R_Limit and current limit is shown below . Thermal Shutdown When the internal junction temperature approximates 160℃, the PT4431 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 115℃, 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 45℃. Low voltage protection A comparator is placed over PT4431 to compare the resistor-divided power supply voltage over LowV (pin 18) with the internal-generated bandgap voltage. When the voltage over LowV is higher than the bandgap (about 1.21V) voltage, TLPA05 will stay in normal operation. When the voltage over LowV is lower than the bandgap voltage, OpAmp A and OpAmp B will be shut down to prevent any improper operation. PRE1.0 4 August 2015 PT4431 ABSOLUTE MAXIMUM RATINGS Vee = 0 V Parameter Analog Supply Voltage Logic Supply Voltage Maximum Junction Temperature (Operating Range -40oC to 125oC) Symbol 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 RECOMMENDED OPERATING CONDITIONS Vee = 0 V Parameter Symbol Analog Supply Voltage Logic Supply Voltage 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 PT4431 ELECTRICAL CHARACTERISTICS Nominal conditions: VCC = 12.0 V, Vee = GND=0 V, LVDD=3.3V, EN = “High”, T A = +27℃ Parameter Symbol Conditions Min. Typ. Max. Unit VCC LVDD ICC EN = “High” 6 3 25 12 3.3 35 24 5 40 V V mA Istandby EN = “Low” 10 TBD μA +/- 3 +/-10 -45 1 mV dB nA Vcc-3 70 V dB 75 MHz V/μS Power Supply Analog Supply Voltage Logic Supply Voltage Consumption DC Current Total DC Current (stand-by mode) 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 Total Harmonic Distortion + Noise Vos PSRR Ib Vcc=12V, Vee=0V Vcc=12V, Vee=0V Vcm RL=500Ω G=5, Vout=10Vpp SR THD+N G=1, RL=50Ω, Vout=8Vpp, f=100KHz, Cin=220μF, Cout=330μF +/- 1 -50 0.1 0 50 60 0.2 45 1 0.05 0.2 0.35 % 0.1 0.1 0.3 0.3 100 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 0.4 % 2 2 V V pF Output Voltage Output Swing from Rail @ 100KHz Capacitive Load Drive VOH VOL CLOAD RL=500Ω@Vcc/2 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 Vos PSRR Ib Vcc=12V, Vee=0V Vcc=12V, Vee=0V Vcm RL=5Ω G=2, Vout=10Vpp SR THD+N G=1, RL=50Ω, Vout=7Vpp, f=100KHz, Cin=220μF, Cout=330μF 0.2 70 1 0.1 Output Voltage Output Swing from Rail @ 100KHz Capacitive Load Drive PRE1.0 VOH VOL CLOAD Iout=1A to GND 6 1 1 500 August 2015 PT4431 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 7 August 2015 PT4431 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 8 August 2015