STR-W6735_V データシートの表示（PDF） - Allegro MicroSystems
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STR-W6735_V Datasheet PDF : 13 Pages
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STR-W6735
Quasi-Resonant Topology
Primary Switching Regulators
ELECTRICAL CHARACTERISTICS Test Conditions*
Parameter
Test Conditions
Operation Start Voltage
VCC voltage at which oscillation starts.
Operation Stop Voltage
VCC voltage at which oscillation stops.
Circuit Current In Operation
Inflow current flowing into power supply terminal in oscillation.
Circuit Current In Non-operation Inflow current flowing into power supply terminal prior to oscillation.
Oscillation Frequency
Soft Start Operation Stop Voltage
Oscillating frequency ( fosc= 1 / T ).
SS/OLP terminal voltage at which ISS/OLP reach ≥–100 μA by raising the SS/OLP terminal
voltage from 0 V gradually.
Soft Start Operation Charging
Current
SS/OLP terminal charging current (SS/OLP terminal voltage = 0 V).
Input 1 μs pulse width, as shown in waveform 1, to OCP/BD terminal twice after V1-3 rises.
Bottom-Skip Operation Threshold After that, offset the input waveform gradually from 0 V in the minus direction. Measurment
Voltage 1
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.
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 OCP/BD terminal voltage at which oscillation stops by lowering the OCP/BD terminal voltage
Voltage
from 0 V gradually.
OCP/BDOCP/BD Terminal Outflow
Current
OCP/BD terminal outflow current (OCP/BD terminal voltage = –0.95 V).
Quasi-Resonant Operation
OCP/BD terminal voltage at which oscillation starts with setting the OCP/BD terminal voltage
Threshold Voltage 1
at 1 V, and then lowering the voltage gradually.
Quasi-Resonant Operation
OCP/BD terminal voltage at which oscillation stops by raising the OCP/BD terminal voltage
Threshold Voltage 2
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.
FB Terminal Inflow Current (Normal
Operation)
FB terminal inflow current (FB terminal voltage = 1.6 V).
Standby Operation Start Voltage VCC voltage at which ICC reaches ≥1 mA (FB terminal voltage = 1.6 V).
Standby Operation Start Voltage
Interval
Specified by VCC(SK) = VCC(S) – VCC(OFF).
Standby Non-Operation Circuit
Inflow current flowing into power supply terminals prior to oscillation (FB terminal voltage =
Current
1.6 V).
FB Terminal
Operation
Inflow Current, Standby
FB
terminal
inflow current (FB
terminal
voltage
=
1.6 V).
FB Terminal Threshold Voltage
FB terminal voltage at which oscillation starts by raising the FB terminal voltage from 0 V
Standby Operation
gradually.
Minimum On Time
Waveform between terminals 1 and 3 at low.
Maximum On Time
Waveform between terminals 1 and 3 at low.
Overload Protection Operation
Threshold Voltage
SS/OLP terminal voltage at which oscillation stops.
Overload Protection Operation
Charging Current
SS/OLP terminal charging current (SS/OLP terminal voltage = 2.5 V).
Overvoltage Protection Operation
Voltage
VCC voltage at which oscillation stops.
Latch Circuit Holding Current
Inflow current at VCC(OFF) – 0.3; after OVP operation.
Latch Circuit Release Voltage
VCC voltage at which ICC reaches 20 μA or lower by decreasing VCC after OVP operation.
*Oscillating operation is specified with a rectangular waveform between terminals 1 and 3.
VCC
(V)
0→20
20→8.8
20
15
20
Measure-
ment
Circuit
1
20
5
20
3
20
2
20
20
0→15
–
4
10.2
10.2
15
20
6
20
1
20
5
–
0→30
VCC(OFF)
1
– 0.3
30→6
28103.30-5
6
SANKEN ELECTRIC CO., LTD.
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