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ACT8601 डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - Radiation Hardened 50 Watt Power Supply Module - Aeroflex Circuit Technology

भाग संख्या ACT8601
समारोह Radiation Hardened 50 Watt Power Supply Module
मैन्युफैक्चरर्स Aeroflex Circuit Technology 
लोगो Aeroflex Circuit Technology लोगो 
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ACT8601 pdf
General Description
Aeroflex’s ACT861X series of power supply modules are radiation hardened 50 Watt units
designed for use in space applications. Using a double ended forward topology with synchronous
rectifiers achieves high efficiency, and the use of Chip-On-Board (COB) construction together with
planar magnetics allows Aeroflex to provide space quality components at down-to-earth prices.
The ACT861X series are full featured single output converters, with EMI filtering, short circuit
protection, input undervoltage shutdown, output overvoltage shutdown, overtemperature shutdown,
input shutdown control and synchronization on both input and output sides. Other output voltages
are available upon request.
Aeroflex’s ACT861X series of power supply modules are radiation hardened 50 Watt units
designed for use in space applications. The block diagram shown in Figure 1 uses a two transistor
(double ended) forward topology to minimize voltage stresses on the semiconductors, and
synchronous rectifiers are used to achieve high efficiency. These full featured converters are
intended to be used in the space environment, conduction cooled to a baseplate and
interconnected to the system via a D connector. The converter includes features such as input
undervoltage shutdown, output overvoltage shutdown, overtemperature shutdown, input shutdown
control and synchronization on both input and output sides. No optocouplers are used in the
converter to assure long term total dose hardness.
The ACT861X series is fabricated as an encapsulated Chip-On-Board module in an aluminum
housing. The Outline Drawing is shown in Figure 2.
The input undervoltage shutdown disables the converter when the input bus is below the
minimum specified setpoint. Nominal input current will be the shutdown current specified. This
prevents the converter from generating low output voltages in the event of bus undervoltages and
drawing high input currents when attempting to power the rated load with these low bus input
voltages. When the input bus voltage is above the minimum specified in Table 1 the converter
commences operation.
Overtemperature protection is integral to the ACT861X series. An internal temperature sensor
mounted near the higher power dissipating components shuts the converter off if the mounting
temperature is above the threshold specified in Table 1. When the converter cools off it will turn
back on with no cycling of input power required.
The output overvoltage circuit uses a portion of the output voltage derived to power the internal
logic (the bootstrap supply) to measure indirectly the output voltage. This voltage is sensed, and if it
exceeds a predetermined threshold the converter will cycle at a nominal 100Hz frequency
attempting to restart.
Control of the ACT861X is achieved via the INHIBIT pin. This pin may be used as both an internal
temperature monitor and to control the module. When INHIBIT is shorted to the IN_COM pin the
module is disabled. Nominal current flowing through the INHIBIT line at this time is less than 1mA,
and the on/off threshold is 6V above the negative return. When the converter temperature sensor is
at –55°C the INHIBIT line will be approximately 8.7V; at 85°C it will be approximately 6.7V. This
affords the user a convenient way to measure the converter internal temperature.
Synchronization may either be referenced to the output ground of the converter or input ground.
When synchronization is referenced to the input ground a low impedance clock waveform,
approximately 50% duty cycle, TTL compatible between 450 and 500KHz, should be applied to the
SYNC_IN terminal and the IN_COM terminal. This will synchronize the switching power converter
although not the feedback oscillator. If it is desired to synchronize both the power converter and
feedback oscillator a low impedance clock waveform, approximately 50% duty cycle, TTL
compatible between 450 and 500KHz, should be applied to the SYNC_OUT terminal and the
OUT_COM terminal.
The STATUS output is an open collector signal, active low, referenced to OUT_COM that is
asserted when the output voltage is within ±10% of the nominal output voltage.
A
Aeroflex Circuit Technology
2 SCD861X REV 2 5/16/00 Plainview NY (516) 694-6700

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