Overview
The PTB48510CAH is a dual complementary-output DC/DC converter module produced by Texas Instruments. This module is designed to power line-driver devices in xDSL telecom applications, particularly for the AC-7 ADSL chipset. It operates from a standard telecom central office supply of –48 V and can provide up to 72 W of power in a balanced load configuration. The module features fixed frequency operation, synchronizable with the PTB48500 DC/DC converter, and includes various protection mechanisms such as undervoltage lockout, over-temperature protection, and output current limit.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Input Voltage Range | - | - | 48 | V |
| Output Power | 0 | - | 65 | W |
| Output Current (IO1, IO2) | 0 | - | 6.5 | A |
| Output Load Imbalance (IO1 - IO2) | 0 | - | 1 | A |
| Output Voltage (VO1, VO2) | 4.75 | 5 | 5.25 | V |
| Switching Frequency | 440 | 470 | 500 | kHz |
| Undervoltage Lockout (VI on) | 33 | - | - | V |
| Temperature Range | -40 | - | 85 | °C |
| Start-up Time | 6 | 10 | 22 | ms |
| Internal Input Capacitance | 3 | - | - | μF |
Key Features
- Complementary Output Voltages: The module produces a pair of regulated output voltages that are complementary to each other, suitable for powering line-driver devices in xDSL applications.
- Fixed Frequency Operation: Operates at a fixed frequency, allowing synchronization with the PTB48500 DC/DC converter.
- Protection Mechanisms: Includes undervoltage lockout, over-temperature protection, output current limit, and output overvoltage protection (for PTB48511 models).
- Industry Standard Outline: Designed with an industry standard outline, eliminating the need for a heatsink and available in both through-hole and surface mount configurations.
- Sequencing Capability: The module can be controlled to power up in sequence with the PTB48500 DC/DC converter, meeting system power and sequencing requirements.
Applications
The PTB48510CAH is primarily designed for xDSL telecom applications, particularly for powering line-driver devices in the AC-7 ADSL chipset. It is also suitable for other analog applications requiring complementary supply voltages with relatively balanced loads.
Q & A
- What is the input voltage range for the PTB48510CAH?
The input voltage range is –48 V, typical for telecom central office supplies.
- What is the maximum output power of the PTB48510CAH?
The module can provide up to 65 W of power in a balanced load configuration.
- What are the output voltage options for the PTB48510CAH?
The PTB48510CAH provides ±5 V output voltages.
- Does the PTB48510CAH have overvoltage protection?
No, the PTB48510CAH does not have output overvoltage protection; this feature is available in the PTB48511 models.
- How does the synchronization with PTB48500 work?
The PTB48510CAH can be synchronized with the PTB48500 DC/DC converter by connecting the Sync In pin to the Sync Out of the PTB48500, allowing both modules to operate at the same switching frequency.
- What are the temperature range and reliability specifications of the PTB48510CAH?
The module operates over a temperature range of –40°C to 85°C and has a reliability specification of 2.7 x 10^6 hours MTBF at 40°C, ground benign, per Telcordia SR-332 50% stress.
- Can the output voltages be adjusted?
Yes, the output voltages can be adjusted simultaneously using the VOAdj pin.
- What safety approvals does the PTB48510CAH have?
The module has safety approvals including EN 60950 and UL/cUL 60950.
- Is the PTB48510CAH recommended for new designs?
No, the PTB48510CAH is not recommended for new designs.
- What is the switching frequency of the PTB48510CAH?
The switching frequency is between 440 kHz and 500 kHz.
