MB3873 Datasheet, PDF (6/22 Pages) Fujitsu Component Limited. – Multi-Resonance AC/DC Converter IC

MB3873
s ELECTRICAL CHARACTERISTICS
(Ta = +25°C, VCC = 18 V, VCC (O) = VREF)
Parameter
Symbol Pin no
Conditions
Value
Unit
Min. Typ. Max.
Output voltage
Reference
Ta = 25°C
VREF
10
Ta = –30 to +85°C
7.6
8.0
8.4 V
7.44 8.0 8.56 V
voltage Input stability
Line 10 VCC = 10 V to 28 V
–30
—
30 mV
block
[Ref]
Load stability
Load 10 VREF = 0 mA to –10 mA —
25
50 mV
Short circuit output
current
IOS
10 VREF = 4 V
–35 –25 –15 mA
Under
voltage ^{Threshold voltage}
lockout
circuit block _{Hysteresis width}
[UVLO]
VTLH
VTHL
VH
10 VCC =
10 VCC =
10 VH = VTLH – VTHL
15
16
17 V
8.8
9.3
9.8 V
—
6.7

V
Triangular
wave
oscillator
block
Oscillator frequency
fOSC1
fOSC2
8
CT = 220 pF, RT = 33 kΩ,
FB = VREF, CS = OPEN
95
105 115 kHz
8
CT = 220 pF, RT = 33 kΩ,
FB = –1 mA, CS = OPEN
535
630
725 kHz
[OSC]
Frequency
temperature stability
∆f/fdt
8 Ta = –30 to +85°C
—
1.0*
—
%
ICS1
Charge current
ICS2
Soft start
block
fCS1
[CS]
Soft start frequency
fCS2
6 CS = 0 V
–35 –25 –15 µA
6 CS = 2 V
–3.5 –2.5 –1.5 µA
8
CT = 220 pF, RT = 33 kΩ,
FB = VREF, CS = 0 V
380
450
520 kHz
8
CT = 220 pF, RT = 33 kΩ,
FB = VREF, CS = OPEN
95
105 115 kHz
Dead time
control
block
[DTC]
Dead time
tDEAD
8 RD = 120 kΩ
400 500 600 ns
Overload Threshold current
ITH
5
detection _{Threshold voltage}
VTH
4
block
[OCP] ^{Charge current}
ICD
4
—
–60 –40 –20 µA
—
3.7
3.9
4.1 V
—
–14 –10
–6 µA
Overvoltage _{Threshold voltage}
detection
comparator
block1 ^{Input bias current}
[OVP1]
VTH
14
—
IB
14 OVP = 0 V
2.37 2.50 2.63 V
–400 –50
— nA
*: Standard design value.
(Continued)
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