ALTAIR05T-800TR STMicroelectronics, ALTAIR05T-800TR Datasheet - Page 5

• Manufacturer Part Number: ALTAIR05T-800TR
• Description: Switching Converters, Regulators & Controllers 800V Off-line QR Switching Regulator
• Manufacturer: STMicroelectronics

Specifications of ALTAIR05T-800TR

• Input Voltage: 11.5 V to 23 V
• Switching Frequency: 166 KHz
• Operating Temperature Range: - 55 C to + 150 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC-16
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ALTAIR05T-800
Table 1.
13 to 16
9-11
12
N.
6
7
8
ZCD/FB
DRAIN
COMP
Name
CDC
N.A
N.C
Pin functions (continued)
Transformer’s demagnetization sensing for quasi-resonant operation. Input/output voltage
monitor. A negative-going edge triggers MOSFET’s turn-on. The current sourced by the pin
during ON-time is monitored to get an image of the input voltage to the converter, in order to
compensate the internal delay of the current sensing circuit and achieve a CC regulation
independent of the mains voltage. If this current does not exceed 50µA, either a floating pin
or an abnormally low input voltage is assumed, the device is stopped and restarted after Vcc
has dropped below 5V. Still, the pin voltage is sampled-and-held right at the end of
transformer’s demagnetization to get an accurate image of the output voltage to be fed to the
inverting input of the internal, transconductance-type, error amplifier, whose non-inverting
input is referenced to 2.5V. Please note that the maximum I
to not exceed ±2 mA (AMR) in all the Vin range conditions (85-265 Vac). No capacitor is
allowed between the pin and the auxiliary transformer.
Output of the internal transconductance error amplifier. The compensation network is placed
between this pin and GND to achieve stability and good dynamic performance of the voltage
control loop.
Cable drop compensation input. During CV regulation this pin, capable of sinking current,
provides a voltage lower than the internal reference voltage (2.5V) by an amount proportional
to the dc load current. By connecting a resistor between this pin and ZCD/FB, the CV
regulation setpoint is increased proportionally. This allows that the voltage drop across the
output cable be compensated and, ideally, that zero load regulation at the externally available
terminals be achieved. Leave the pin open if the function is not used.
Not available. These pins must be left not connected
Not internally connected. Provision for clearance on the PCB to meet safety requirements.
Drain connection of the internal power section. The internal high-voltage start-up generator
sinks current from this pin as well. Pins connected to the internal metal frame to facilitate
heat dissipation.
Doc ID 17957 Rev 1
Function
ZCD/FB
sunk/sourced current has
Pin connection
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