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STR-W6765 Datasheet(PDF) 6 Page - Allegro MicroSystems

Part No. STR-W6765
Description  Quasi-Resonant Topology Primary Switching Regulators
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Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
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STR-W6765 Datasheet(HTML) 6 Page - Allegro MicroSystems

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Quasi-Resonant Topology
Primary Switching Regulators
STR-W6765
6
ELECTRICAL CHARACTERISTICS Test Conditions*
Parameter
Test Conditions
VCC
(V)
Measure-
ment
Circuit
Operation Start Voltage
VCC voltage at which oscillation starts.
0→20
1
Operation Stop Voltage
VCC voltage at which oscillation stops.
20→8.8
Circuit Current In Operation
Inflow current flowing into power supply terminal in oscillation.
20
Circuit Current In Non-operation
Inflow current flowing into power supply terminal prior to oscillation.
15
Oscillation Frequency
Oscillating frequency ( fosc= 1 / T ).
20
Soft Start Operation Stop Voltage
SS/OLP terminal voltage at which ISS/OLP reach ≥–100 μA by raising the SS/OLP terminal
voltage from 0 V gradually.
20
5
Soft Start Operation Charging
Current
SS/OLP terminal charging current (SS/OLP terminal voltage = 0 V).
Bottom-Skip Operation Threshold
Voltage 1
Input 1 μs pulse width, as shown in waveform 1, to OCP/BD terminal twice after V1-3 rises.
After that, offset the input waveform gradually from 0 V in the minus direction. Measurment
of the offset voltage VOCPBD(BS1) is taken when the V1-3 start-to-fall point switches from two-
pulses-after to one-pulse-after.
20
3
Bottom-Skip Operation Threshold
Voltage 2
After measuring VOCPBD(BS1), as shown in waveform 2, offset the input waveform gradually.
Measurment of the offset voltage VOCPBD(BS2) is taken when the V1-3 start-to-fall point
switches from two-pulses-after to one-pulse-after.
Overcurrent Detection Threshold
Voltage
OCP/BD terminal voltage at which oscillation stops by lowering the OCP/BD terminal voltage
from 0 V gradually.
20
2
OCP/BDOCP/BD Terminal Outflow
Current
OCP/BD terminal outflow current (OCP/BD terminal voltage = –0.95 V).
Quasi-Resonant Operation
Threshold Voltage 1
OCP/BD terminal voltage at which oscillation starts with setting the OCP/BD terminal voltage
at 1 V, and then lowering the voltage gradually.
Quasi-Resonant Operation
Threshold Voltage 2
OCP/BD terminal voltage at which oscillation stops by raising the OCP/BD terminal voltage
from 0 V gradually.
FB Terminal Threshold Voltage
FB terminal voltage at which oscillation stops by raising the FB terminal voltage from 0 V
gradually.
20
4
FB Terminal Inflow Current (Normal
Operation)
FB terminal inflow current (FB terminal voltage = 1.6 V).
20
Standby Operation Start Voltage
VCC voltage at which ICC reaches ≥1 mA (FB terminal voltage = 1.6 V).
0→15
Standby Operation Start Voltage
Interval
Specified by VCC(SK) = VCC(S) – VCC(OFF).–
Standby Non-Operation Circuit
Current
Inflow current flowing into power supply terminals prior to oscillation (FB terminal voltage =
1.6 V).
10.2
FB Terminal Inflow Current, Standby
Operation
FB terminal inflow current (FB terminal voltage = 1.6 V).
10.2
FB Terminal Threshold Voltage
Standby Operation
FB terminal voltage at which oscillation starts by raising the FB terminal voltage from 0 V
gradually.
15
Minimum On Time
Waveform between terminals 1 and 3 at low.
20
6
Maximum On Time
Waveform between terminals 1 and 3 at low.
20
1
Continued on the next page…
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com


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