PTB48540AAZ

Not Recommended for New Designs PTB48540 Series 10-W Power-Over-Ethernet Isolated Power Module Assembly SLTS224B – APRIL 2004 – REVISED JULY 2004 Features • Input Voltage Range: 36 V to 57 V • 10 W Output • IEEE Std. 802.3af Compliant (for PoE-PD Interface) • 85 % Efficiency • Low Profile (9 mm) • Output Voltage Trim/Adjust • Under-Voltage Lockout • Input Transient Suppressor • Internal EMI Filter • Meets FCC Class B Radiated & Class A Conducted • Output Inhibit Control • Short Circuit Protection • Over Temperature Shutdown • 1500 VDC Isolation • Safety Approvals (Pending): UL 60950, cUL 60950, EN60950 Description Pin Assignments The PTB48540 series of power modules is specifically designed to provide an isolated, low-voltage power source to a remote Powered Device (PD) in PowerOver-Ethernet (PoE) applications. These modules are rated 10 W and incorporate all the necessary interface requirements to comply with IEEE Std. 802.3af, for managing the input power to the PD from the PoE Power Sourcing Equipment (PSE). This includes PD detection and PD classification current signatures required for the PSE. The modules are compatible with PD classifications, class 0 through class 3. In addition to a fully integrated DC/DC converter, each PTB48540 power module incorporates internal input diode bridges to support both Data Line and Spare Line pair standard Ethernet power connections, an integral transient suppressor for input over-voltage protection, and an EMI filter to ensure noise compatibility with Ethernet data signals. Other features include an input undervoltage lockout (UVLO), over-current and short-circuit protection, an output voltage adjust/trim, and over-temperature protection. An “Output Inhibit” control allows the output voltage to be turned off to support an idle condition or power saving mode. The output voltage options are for 3.3-V, 5-V, or 12-V output. The target applications are small low-power remote IP appliances, such as security card readers and cameras, test dongles, and IP phone consoles. –VOUT Output Inhibit Class A Class B Product Top View 13 12 11 PoE-PD Interface Switch (TPS2375) 1 10 Data Line A 9 Data Line B Transient Suppression 8 Spare Line A Data/Spare Line Bridge Rectifiers 7 Spare Line B EMI Filter For technical support and further information visit http://power.ti.com DC/DC Converter 4 5 6 Detect B 3 Detect A +VOUT 2 Input Ref VOUT Adj Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 Function –Vout Vout Adj +Vout Input Ref Detect A Detect B Spare Line B Spare Line A Data Line B Data Line A Class B Class A Output Inhibit * Shaded functions indicate signals electrically common with the input. * Denotes negative logic: Open = Normal operation Low (Input Ref) = Output Off Not Recommended for New Designs PTB48540 Series 10-W Power-Over-Ethernet Isolated Power Module Assembly SLTS224B – APRIL 2004 – REVISED JULY 2004 Ordering Information Output Voltage (PTB48540❒xx) Package Options (PTB48540x❒❒) Code A B C Code AH AS Voltage 5V 3.3 V 12 V Description Horiz. T/H SMD, Standard (2) Pkg Ref. (EUP) (EUQ) (1) Notes: (1) Reference the applicable package reference drawing for the dimensions and PC board layout (2) “Standard” option specifies 63/37, Sn/Pb pin solder material. Pin Descriptions –VOUT: This is the negative output from the module, with respect to +Vout. Both the +Vout and –Vout terminals are isolated from the Ethernet input, and used to power the PD appliance. When this pin is connected to the PD appliance common, a positive supply voltage is produced at +Vout. VOUT Adj: By connecting a single resistor to this pin, the regulated output voltage may be adjusted/trimmed by up to ±10 % from the original set-point value. If no adjustment is desired, this pin should be left open circuit. +VOUT: This is the positive output from the module with respect to –Vout, and is used to power the PD appliance. By connecting this pin to the PD appliance common, a negative supply voltage will be produced at –Vout. Input Ref: This pin provides access to the –Vin of the internal DC/DC converter, and is the 0-VDC reference for the ‘Output Inhibit’ control. Detect A: This is a control input that is normally left open circuit. The module incorporates an internal 24.9-kΩ resistor, between the ‘Detect A’ and ‘Detect B’ pins. This provides the PD with a correct “valid device” detection resistance for the PSE. By placing an external resistor between the ‘Detect A’ and ‘Detect B’ pins (in parallel with the internal 24.9-kΩ resistor) the module can be made to identify itself as a “non-valid device.” Detect B: This pin is used in conjunction with the ‘Detect A’ input only when it is desired for the PD to communicate a “non-valid” device signature to the PSE (see ‘Detect A’ description). ‘Detect B’ is also the rectified DC output from the module’s internal diode bridges, and represents the positive DC input to the module’s DC/DC converter. Connecting an external capacitor between this pin and the ‘Input Ref’ pin (0 V), adds more filter capacitance across the input of the DC/DC converter. Data Line A/B: These are the main inputs from which the module obtains DC input power from the Ethernet connector. The connection of these inputs to the Ethernet connections must be via an IEEE 802.3af compliant signal tranformer, that is designed for use in a PoE application. This is necessary to preserve the integrity of the Ethernet data traffic. Consult the example application for further information. Spare Line A/B: These are alternative inputs from which the module may obtain DC input power. In a PoE application, ‘Spare Line A’ may be directly connected to pins 4 & 5, and ‘Spare Line B’ to pins 7 & 8 of an Ethernet RJ-45 connector. These connections are not used for data transmission. Class A/B: The control inputs ‘Class A’ and ‘Class B’ allow the PD Class to be programmed from the module. The module incorporates an internal 4.42-kΩ resistor between the ‘Class A’ and ‘Class B’ inputs. This corresponds to a default “Class 0” PD classification signature being sent to the PSE. By adding an external resistor across these pins, the module can be programmed to other PD classifications. For further information, consult the PD class reference table in the application notes. Output Inhibit: This is an open-collector (or open-drain) negative logic input. Applying a low-level voltage to this input, with respect to the ‘Input Ref ’ pin, turns off the DC output voltage from the module. If the pin is left open-circuit, the module will operate as normal, producing an output voltage whenever it is connected to a valid PoE input source. For technical support and further information visit http://power.ti.com Not Recommended for New Designs PTB48540 Series 10-W Power-Over-Ethernet Isolated Power Module Assembly Specifications SLTS224B – APRIL 2004 – REVISED JULY 2004 (Unless otherwise stated, T a =25°C, Vin =48V (1), and Io =Iomax) PTB48540 SERIES Characteristic Symbol Conditions Output Current Io Over Vin range Input Voltage Range Set Point Voltage Tolerance Temperature Variation Line Regulation Load Regulation Total Output Voltage Variation Vin Vo tol Regtemp Regline Regload ∆Votot Over Io Range Efficiency η Vo Ripple (pk-pk) Transient Response Vr ttr ∆Vtr Output Voltage Adjust Current Limit Threshold Switching Frequency Under-Voltage Lockout Vadj Ilim ƒs UVLO Output Inhibit (Pin 13) Input High Voltage Input Low Voltage Input Low Current VIH VIL IIL Standby Input Current External Output Capacitance Iin standby Cout pins 13 & 4 connected Internal Input Capacitance Cin Detection Resistance Classification Current Operating Temperature Range Over Temperature Protection Rdetect Iclass Ta OTP Vin < UVLO threshold Vin > UVLO threshold 2.7 V ≤ Vin ≤ 10.1 V 14.5 V ≤ Vin ≤ 20.5 V Over Vin range Measured at pin 7 Isolation Voltage Capacitance Resistance Solder Reflow Temperature Storage Temperature Reliability Treflow Ts MTBF Mechanical Shock — Mechanical Vibration — Weight Flammability — — PTB48540A (5 V) PTB48540B (3.3 V) PTB48540C ( 12 V) –40 ≤Ta ≤ +85 °C, Io =Iomin Over Vin range Over Io range Includes set-point, line, load, –40 ≤Ta ≤ +85 °C PTB48540C (12 V) PTB48540A (5 V) PTB48540B (3.3 V) 20 MHz bandwidth 1 A/µs load step, 50 % to 100 % Iomax Vo over/undershoot Vo ≤ 5 V Vo =12 V Vin = 42 V, ∆Vo = –1 % Over Vin range Vin rising Vin falling Referenced to Input Ref (pin 4) Vo ≤ 5 V Vo = 12 V Threshold Hysterisis Input–output Surface temperature of module body or pins — Per Bellcore TR-332 50 % stress, Ta =40 °C, ground benign Per Mil-Std-883D, method 2002.3, 1 mS, half-sine, mounted to a fixture Mil-Std-883D, Method 2007.2 Pkg EUP 20-2000 Hz, soldered to PC Pkg EUQ — Materials meet UL 94V-0 Min Typ Max 0.1 (2) 0.1 (2) 0.1 (2) 36 — — — — — — — — — ±1 ±0.2 ±1 ±5 ±1.5 2 3 0.85 57 (1) ±2 — — — ±3 Units — — — — — — — — — 200 — 30 85 82 79 50 100 ±150 ±200 ±10 150 300 40 32 — — — — — — — — — 400 42 — 4.5 –0.2 — — 0 (4) 0 (4) 0.05 5 23.75 2 –40 135 — 1500 — 10 — –40 4 — — –2 1 — — 0.1 7 24.9 (5) 2.5 (6) — — 20 — 1,100 — — — — Open (3) +0.8 — — 1000 330 0.12 — 26.25 3 +85 (7) — — — — — 235 (8) +125 — — 500 — G’s — — — 20 7.5 12 — — — G’s A VDC %Vo %Vo mV mV %Vo % mVpp µs mV %Vo %Iomax kHz V V mA mA µF µF kΩ mA °C °C V pF MΩ °C °C 106 Hrs grams Notes: (1) The input voltage Vin is applied and measured between ‘Data Line A’ (pin 10) and ‘Data Line B’ (pin 9), or between ‘Spare Line A’ (pin 8) and ‘Spare Line B (pin 7). These inputs accept either polarity. (2) The DC/DC converter will operate at no load with reduced specifications. (3) The Output Inhibit (pin 13) is referenced to ‘Input Ref ’ (pin 4) and has an internal pull-up. If it is left open circuit the converter will operate when input power is applied. The open-circuit voltage is typically 5 V. Refer to the application notes for interface considerations. (4) An output capacitor is not required for proper operation. (5) This is the default for a “Valid Device” PD detection signature. (6) This is the default for a “Class 0” PD classification signature. (7) See Safe Operating Area curves or contact the factory for the appropriate derating. (8) During the reflow of the SMD package version do not elevate the peak temperature of the module, pins, or internal components above the stated maximum. For technical support and further information visit http://power.ti.com Not Recommended for New Designs Typical Characteristics PTB48540 Series 10-W Power-Over-Ethernet Isolated Power Module Assembly PTB48540B; Vo =3.3 V SLTS224B – APRIL 2004 – REVISED JULY 2004 PTB48540A; Vo =5 V (See Note A) Efficiency vs Load Current Efficiency vs Load Current 100 42 V 48 V 57 V 70 80 42 V 48 V 57 V 70 60 60 50 0.5 1 1.5 2 2.5 3 Output Ripple vs Load Current 0.4 0.8 1.2 1.6 2 0 Output Ripple vs Load Current 80 80 60 42 V 48 V 57 V 40 20 VIN Ripple - mV 40 20 0 2.5 3 Power Dissipation vs Load Current 0.4 0.8 1.2 1.6 2 0 1.5 42 V 48 V 57 V 1 Pd - Watts 1 VIN VIN Pd - Watts 1.5 0 3 0 0.4 Iout - Amps 0.8 1.2 1.6 0 2 60 50 40 30 80 Airflow 70 400LFM 200LFM 100LFM Nat conv 60 50 40 30 20 20 1.0 1.5 Iout (A) 2.0 2.5 3.0 0.8 90 Ambient Temperature (°C) 400LFM 200LFM 100LFM Nat conv Ambient Temperature (°C) Airflow 70 0.6 Safe Operating Area (See Note B) 90 80 0.4 Iout - Amps Safe Operating Area (See Note B) Safe Operating Area (See Note B) 0.5 0.2 Iout - Amps 90 0.0 42 V 48 V 57 V 1 0 0 2.5 1.5 0.5 0.5 0.5 2 0.8 2 2 42 V 48 V 57 V 0.6 2.5 VIN 2 0.4 Power Dissipation vs Load Current Power Dissipation vs Load Current 2.5 1.5 0.2 Iout - Amps 2.5 1 40 Iout - Amps 3 0.5 42 V 48 V 57 V 0 0 Iout - Amps 0 60 20 0 2 0.8 VIN Ripple - mV Ripple - mV 42 V 48 V 57 V 0.6 Output Ripple vs Load Current 80 60 0.4 100 VIN 1.5 0.2 Iout - Amps 100 1 70 Iout - Amps 100 0.5 42 V 48 V 57 V 50 0 Iout - Amps 0 VIN 80 60 50 0 Pd - Watts Efficiency - % 80 90 VIN Efficiency - % Efficiency - % 100 90 VIN (See Note A) Efficiency vs Load Current 100 90 Ambient Temperature (°C) PTB48540C; Vo =12 V (See Note A) 80 Airflow 70 400LFM 200LFM 100LFM Nat conv 60 50 40 30 20 0.0 0.4 0.8 1.2 Iout (A) 1.6 2.0 0.0 0.2 0.4 0.6 0.8 Iout (A) Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the converter. Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures. Derating limits apply to modules soldered directly to a 4 in. × 4 in. double-sided PCB with 1 oz. copper. For technical support and further information visit http://power.ti.com Not Recommended for New Designs Application Notes PTB48540 Series Operating Features of the PTB48540 Series Power-Over-Ethernet Modules Overview Figure 1-1 shows the block diagram of the PTB48540 series of Power-over-Ethernet (PoE) modules. Input power to the module can be supplied through either the Data Line A/B or Spare Line A/B associated Ethernet connections. A diode bridge associated with each of these input pairs allows the input source to be supplied in either polarity. A transient suppressor, located across the common output of the diode bridges, protects the module against power surges. The input power to the internal DC/DC converter is controlled by the TPS2375 IC. This IC is a power interface switch, specifically designed for use with PoE powered devices. The IC provides the device detection, classification, and current limiting control that is necessary for a powered device (PD) to comply with the IEEE 802.af Standard. The DC/DC converter input circuit includes an EMI filter, which maintains the module in compliance with CISPR 22 (EN5022); class ‘B’ for radiated, and class ‘A’ for conducted emissions. PD Detection Prior to power up, the PoE power sourcing equipment (PSE) must detect a 24.9-kΩ “discovery” load resistance from the PD. This default value of resistance is necessary for the PD to be recognized as a “valid device” by the PSE. A 24.9-kΩ resistor is provided internally to the PTB48540 modules. It is located across the ‘Detect A’ (pin 5) and ‘Detect B’ (pin 6) terminals. By placing an external resistor across these pins (in parallel with the internal 24.9-kΩ resistor), the module can be made to communicate a “non-valid device” signature to the PSE. A non-valid device is recognized by a resistance of less than 12 kΩ. Connecting a 16.9-kΩ external resistor between the ‘Detect A’ and ‘Detect B’ pins creates an equivalent resistance of 10 kΩ. This is sufficient to communicate a non-valid device signature. The external resistor should not be less than 16.9 kΩ as this increases power dissipation in the power interface IC. PD Classification Signature The PSE uses a classification current to determine the maximum supply current that the PD is allowed to draw. The classification current is sensed by the PSE when the supply voltage to the PD is between 15 V and 20 V. The classification current is set on the PTB48540 by a programming resistance. Table 1-1 gives the resistance values Figure 1 1; Block Diagram of the PTB48540 Series Modules Output Inhibit 13 Input Ref 4 Detect A 5 External RDETECT PD Detect 24.9 k (Valid Device) Detect B 6 1500 VDC Isolation Data Line A 10 Data Line B 9 Spare Line A 8 1 2 Spare Line B 7 3 4 Class B 11 External RCLASS DC/DC Converter TPS2375 PoE Interface Class Select 4.42 k (Class 0) Class A 12 For technical support and further information visit http://power.ti.com ILIM VDD CLASS NC DETECT EN_DC VEE RTN 8 7 Inhibit Adjust 2 VOUT Adj +VIN +VOUT 3 + VOUT –VIN –VOUT 1 –VOUT Input EMI Filter 6 5 Not Recommended for New Designs Application Notes continued PTB48540 Series Table 1-1; PD Class Programming Resistance PD Class PD Demand (watts) Usage Min Max Class Program Resistance External Resistor 0 Default 0.44 12.95 4.42 kΩ None 1 Optional 0.44 3.84 950 Ω 1.21 kΩ 2 Optional 3.84 6.49 543 Ω 619 Ω 3 Optional 6.49 12.95 360 Ω 392 Ω 4 Not Allowed — Future Use — 252 Ω 267 Ω for the different types of PD class defined in the IEEE 802.3af Standard. The power modules support the PD classification protocol with a default ‘Class 0’ signature. ‘Class 0’ corresponds to a 4.42-kΩ programming resistance, which is set by an internal resistor located between the ‘Class A’ (pin 12) and ‘Class B’ (pin 11) terminals. By placing an external resistor across the Class A/B pins (in parallel with the internal 4.42-kΩ resistor) the power module can be made to communicate one of the alternate classifications to the PSE. Consult Table 1-1 for the external resistance values. Under-Voltage Lockout The UVLO prevents the internal DC/DC converter from seeing an input voltage until the voltage applied to either the ‘Data Line A/B’ or ‘Spare Line A/B’ pair of Ethernet connections approaches 42 V. The UVLO threshold correlates to a voltage between the ‘Detect B’ (pin 6) and ‘Class B’ (pin 11) terminals of approximately 39.3 V. Only after the voltage applied from the Ethernet is above the UVLO threshold is the module’s internal bus voltage allowed to rise. The internal bus powers the DC/DC converter and can be measured between the ‘Detect B’ (pin 6) and ‘Input Ref’ (pin 4) terminals. Input Capacitance In accordance with the IEEE 802.3af Standard, the PTB48540 power modules provide an input capacitance of 0.1 µF to the PSE when communicating the required detection and classification signatures. Once fully powered (Vin ≥42 V), the PSE will see the combined input capacitance of the EMI filter and DC/DC converter; approximately 7 µF. This capacitance is sufficient to operate the module’s internal DC/DC converter, and satisfies the 5 µF minimum capacitance required by the IEEE 802.3af Standard. For improved hold-up capability, this input capacitance can be increased with an external capacitor. Connect the anode of the external capacitor to ‘Detect B’ (pin 6), and the cathode to the ‘Input Ref’ (pin 4). During power up the power interface IC limits the inrush current for charging the input capacitance. Additional capacitance increases the power dissipation in the IC. For this reason the maximum recommended value of external capacitance is 220 µF (100-V electrolytic). Startup Startup of the module in a PoE application consists of a complex process of handshaking states between the module and PSE. During the PD detection state the PSE uses a low voltage (