STR-X6737 Allegro Microsystems Inc, STR-X6737 Datasheet - Page 6

• Manufacturer Part Number: STR-X6737
• Description: SMPS Primary Switcher, (Bottom Skip Quosi-resonance Switching Type)
• Manufacturer: Allegro Microsystems Inc

STR-X6737
ELECTRICAL CHARACTERISTICS
ELECTRICAL CHARACTERISTICS for Controller (MIC)
Power Supply Start-up Operation
Operation Start Voltage
Operation Stop Voltage
Circuit Current In Operation
Circuit Current In Non-Operation
Oscillation Frequency
Soft Start Operation Stop Voltage
Soft Start Operation Charging Current
Normal Operation
Bottom-Skip Operation Threshold Voltage 1
Bottom-Skip Operation Threshold Voltage 2
Overcurrent Detection Threshold Voltage
OCP/BD Terminal Outflow Current
Quasi-Resonant Operation Threshold Voltage 1
Quasi-Resonant Operation Threshold Voltage 2
FB Terminal Threshold Voltage
FB Terminal Inflow Current (Normal Operation)
Standby Operation
Standby Operation Start Voltage
Standby Operation Start Voltage Interval
Standby Non-Operation Circuit Current
FB Terminal Inflow Current, Standby Operation
FB Terminal Threshold Voltage, Standby Operation
Minimum On Time
Protection Operation
Maximum On Time
Overload Protection Operation Threshold Voltage
Overload Protection Operation Charging Current
Overvoltage Protection Operation Voltage
Latch Circuit Holding Current
Latch Circuit Release Voltage
ELECTRICAL CHARACTERISTICS for MOSFET, valid at T
Drain-to-Source Breakdown Voltage
Drain Leakage Current
On Resistance
Switching Time
Thermal Resistance
1
terminal named.
2
Current polarity with respect to the IC: positive current indicates current sink at the terminal named, negative current indicates source at the
The latch circuit means a circuit operated OVP and OLP.
Characteristic
2
2
Off-Line Quasi-Resonant Switching Regulators
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
V
V
V
V
V
V
I
V
V
I
SSOLP(OLP)
Symbol
OCPBD(BS1)
OCPBD(BS2)
OCPBD(TH1)
OCPBD(TH2)
V
V
SSOLP(SS)
OCPBD(LIM)
V
SSOLP(OLP)
t
V
I
CC(La.OFF)
SSOLP(SS)
V
t
R
I
I
I
ON(MAX)
CC(OFF)
V
ON(MIN)
R
V
CC(OFF)
CC(ON)
OCPBD
I
CC(OVP)
I
FB(OFF)
FB(ON)
I
V
1
CC(ON)
CC(SK)
CC(S)
CC(H)
I
FB(S)
DS(on)
f
, valid at T
CC(S)
FB(S)
DSS
θch-F
osc
DSS
t
f
A
= 25°C, unless otherwise specified
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
I
V
I
Channel to internal frame
DSS
DS
CC
CC
CC
SS/OLP
SS/OLP
OCP/BD
OCP/BD
OCP/BD
OCP/BD
FB
FB
CC
CC(SK)
CC
CC
CC
SS/OLP
CC
CC(OFF)
CC
A
DSSS
= 25°C, V
rising
= 1.6 V
= 4.0 A
= 0→20 V
= 20→8.8 V
= 15 V
= 0→15 V, V
= 10.2 V, V
= 10.2 V, V
= 15 V, V
= 0→30 V
= 30→6 V, OVP operating
= 300 μA
= 500 V
= V
increasing
= 0 V
= 2.5 V
falling
= –0.95 V
falling
rising
– 0.3 V
Test Conditions
CC(S)
CC
FB
FB
FB
– V
= 20 V, unless otherwise specified
rising
FB
= 1.6 V
= 1.6 V
CC(OFF)
= 1.6 V
–0.720
–0.485
–0.995
–710
–250
Min.
16.3
0.28
0.67
1.32
10.3
1.10
0.55
0.75
27.5
25.5
600
–16
500
8.8
1.1
4.0
6.0
19
–
–
–
–
–
–
–
–
–
–0.665
–0.435
–0.940
–550
–100
1000
Typ.
18.2
0.40
0.80
1.45
1.35
1.10
1.10
32.5
27.7
11.2
–11
9.7
1.2
4.9
7.2
22
20
45
–
–
4
–
–
–
–
–
–0.605
–0.385
–0.895
Max.
–390
1400
19.9
10.6
0.52
0.93
1.58
12.1
1.65
1.50
1.50
39.0
29.9
0.36
1.09
100
–40
140
300
500
1.4
5.8
8.5
25
56
14
–6
6
–
Units
°C/W
kHz
mA
μA
μA
μA
μA
μA
μA
μs
μs
μA
μA
μA
ns
Ω
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
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