Document
1-1-3 DC/DC Converter ICs
SI-8000JF Series Full-Mold, Separate Excitation Step-down Switching Mode
■Features
• Compact full-mold package (equivalent to TO220)
• Output current: 1.5A • High efficiency: 67 to 88% • Requires only 4 discrete components • Internally-adjusted phase correction and
output voltage • Capable of downsize a choke-coil due to IC's
high switching frequency (125kHz). (Compared with conventional Sanken devices) • Built-in foldback-overcurrent and thermal protection circuits • Output ON/OFF available (circuit current at output OFF: 200µA max.) • Soft start available by ON/OFF pin
■Lineup
Part Number VO (V)* IO (A)
* VREF(V) for SI-8015JF
SI-8015JF 1.59
■Absolute Maximum Ratings
Parameter DC Input Voltage
Power Dissipation
Junction Temperature Storage Temperature Thermal Resistance (Junction to Case)
Symbol VIN PD1 PD2 Tj Tstg θj-c
SI-8033JF 3.3
1.5
SI-8050JF 5.0
Ratings 43
16.6 (with infinite heatsink) 1.5 (without heatsink, standalone operation)
+125 –40 to +125
6.0
SI-8120JF 12.0
Unit V W W °C °C
°C/W
■Applications
• Power supplies for telecommunication equipment • Onboard local power supplies
■Recommended Operating Conditions
Parameter
DC Input Voltage Range Output Current Range Operating Junction Temperature Range
Symbol
VIN1 VIN2
IO Tjop
SI-8015JF* VO+2 to 40 VO+3 to 40
Ratings
SI-8033JF
SI-8050JF
5.3 to 40
7 to 40
6.3 to 40
8 to 40
0 to 1.5
–30 to +125
SI-8120JF 14 to 40 15 to 40
Unit
V V A °C
Conditions
IO=0 to 1A IO=0 to 1.5A VIN≥VO+3V
* SI-8015JF is a variable output voltage type. The variable output voltage range is from 2.5 V to 24 V.
■Electrical Characteristics
Parameter
Output Voltage*1
Efficiency
Oscillation Frequency
Line Regulation
Load Regulation Temperature Coefficient of Output Voltage*3 Overcurrent Protection Starting Current
Low Level Voltage ON/OFF*5
Outflow Current Terminal
at Low Voltage
Quiescent Circuit Current
Symbol
VO*2 Conditions
η Conditions
f Conditions ∆VOLINE Conditions ∆VOLOAD Conditions
∆VO/∆Ta*4 IS1
Conditions VSSL ISSL Conditions
Iq Conditions Iq(OFF) Conditions
SI-8015JF min. typ. max. 1.558 1.59 1.622
VIN=12V, IO=0.5A 67
VIN=12V, IO=0.5A 125
VIN=12V, IO=0.5A 25 80
VIN=8 to 30V, IO=0.5A 10 30
VIN=12V, IO=0.2 to 0.8A
±0.5
1.6 VIN=12V 0.5 100 VSSL=0V 7
VIN=12V, IO=0A 200
VIN=12V, VON/OFF=0.3V
Ratings
SI-8033JF
SI-8050JF
min. typ. max. min. typ. max.
3.234 3.30 3.366
4.90 5.00
5.10
VIN=15V, IO=0.5A
VIN=20V, IO=0.5A
77 82
VIN=15V, IO=0.5A
VIN=20V, IO=0.5A
125 125
VIN=15V, IO=0.5A
VIN=20V, IO=0.5A
25 80
40 100
VIN=8 to 30V, IO=1.0A
VIN=10 to 30V, IO=1.0A
10 30
10 40
VIN=15V, IO=0.5 to1.5A
VIN=20V, IO=0.5 to 1.5A
±0.5 ±0.5
1.6 VIN=15V 0.5 100 VSSL=0V 7
VIN=15V, IO=0A 200
VIN=15V, VON/OFF=0.3V
1.6 VIN=20V 0.5 100 VSSL=0V 7
VIN=20V, IO=0A 200
VIN=20V, VON/OFF=0.3V
SI-8120JF min. typ. max. 11.76 12.00 12.24
VIN=24V, IO=0.5A 88
VIN=24V, IO=0.5A 125
VIN=24V, IO=0.5A 60 130
VIN=18 to 30V, IO=1.0A 10 40
VIN=24V, IO=0.5 to 1.5A
±1.0
1.6 VIN=24V 0.5 100 VSSL=0V 7
VIN=24V, IO=0A 200
VIN=24V, VON/OFF=0.3V
*1: Reference voltage for SI-8015JF
*3: Temperature Coefficient of Reference Voltage for SI-8015JF
*2: VREF for SI-8015JF
*4: ∆VREF/∆Ta for SI-8015JF
*5: Pin 5 is the ON/OFF pin. Soft start at power on can be performed with a capacitor connected
to this pin. The output can also be turned ON/OFF with this pin. The output is stopped by setting the
SI-8000JF
voltage of this pin to VSSL or lower. ON/OFF-pin voltage can be changed with an open-collector drive circuit of a transistor. When using both the soft-start and ON/OFF functions together, the discharge current from C3 flows into the ON/OFF control transistor. Therefore, limit the current securely to protect the transistor if C3 capacitance is large. The ON/OFF pin is pulled up to the power supply in the IC, so applying the external voltage is prohibited. If this pin is not
5 ON/OFF
used, leave it open.
SI-8000JF
5 ON/OFF C3
(Ta=25°C) Unit
V % kHZ mV mV mV/ °C A V µA mA µA
SI-8000JF
5 ON/OFF C3
VOUT. ON/OFF
Soft start
Soft start +VOUT. ON/OFF
34 ICs
■External Dimensions (TO220F-5)
10.0±0.2
4.2±0.2 2.8±0.2
φ 3.2±0.2
0.5 4.0±0.2 7.9±0.2 16.9±0.3
2.6±0.1
(2.0)
(8.0)
0.95±0.15
0.85
+0.2 –0.1
P1.7±0.7×4=6.8±0.7
(4.6)
0.45
+0.2 –0.1
3.9±0.7
(4.3) 8.2±0.7
1 23 45
Forming No.1101
■Block Diagram
SI-8015JF
1 VIN
5 ON/OFF
PReg.
OCP
ON/OFF Soft Start
Reset
OSC
+ –
Comp.
Error Amp. + –
GND 3
SW OUT 2
Latch& Drive
TSD
VREF 4
VREF
■Typical Connection Diagram
VIN 220µF
SI-8015JF
1 VIN
SW 2
SI-8015JF
4
+ ON/OFF GND
VREF
53
L1 VOUT
R1 Di
C4
R2 REF
+ 470µF
GND
GND
IREF
IREF shall be approx. 2mA.
C1 : 50V/220µF
C2 : 25V/470µF
C3 : 10V/0.47µF (Only when using soft-start function)
C4 : 6800pF
L1 : 100µH Di : RK16 (Sanken)
VREF × (R1+R2) VOUT=
R2
(17.9)
SI-8000JF Series
(Unit : mm)
Pin Assignment q VIN w SWOUT e GND r VOS t ON/OFF
Plastic Mold Package Type Flammability: UL94V-0 Product Mass: Approx. 2.3g
8.