SANKEN SI-8100QL_11

1-1-3 DC/DC Converter ICs
SI-8100QL Series Current Mode Control Step-down Switching Mode
■Features
■Absolute Maximum Ratings
• DIP8 package
Symbol
Ratings
Unit
• Introduction of current mode control method
Input Voltage
Parameter
VIN
30
V
• Output current: 3.5A
Power Dissipation*1
PD
1.56
W
Junction Temperature*2
Tj
–30 to +150
°C
Storage Temperature
Tstg
–40 to +150
°C
Thermal Resistance (Junction to Case)
θj-c
25
°C/W
Thermal Resistance (Junction to Ambient Air)
θj-a
64
°C/W
• High efficiency: 90% (Vo=5V)
• Built-in reference oscillator (350kHz)
• Built-in drooping-type overcurrent and thermal
protection circuits
• Built-in soft start circuit
Conditions
When mounted on glass-epoxy board measuring 70×60 mm (copper laminate area: 1310 mm2)
When mounted on glass-epoxy board measuring 70×60 mm (copper laminate area: 1310 mm2)
*1: Limited by thermal protection circuit
*2: Note that the detect temperature for thermal protection is about 140°C.
• Built-in on/off function (Active Hi)
• Low current consumption during off
■Applications
■Recommended Operating Conditions
Parameter
Symbol
Ratings
Unit
SI-8105QL
Vo+3*1
Input Voltage Range
VIN
Output Voltage Range
Vo
0.5 to 24
• Onboard local power supplies
Output Current Range
Io
0 to 3.5
A
• OA equipment
Operating Junction Temperature Range
Tjop
–30 to +125
°C
Operating Temperature Range
Top
–30 to +85
°C
• DVD recorder, FPD-TV
to 28
Conditions
V
V
*1: The minimum value of the input voltage range is 4.75 V or Vo +3 V, whichever is higher.
■Electrical Characteristics
(When Ta=25°C and Vo=5V)
Ratings
Parameter
Symbol
SI-8105QL
min.
VADJ
Reference Voltage
0.485
Conditions
Temperature Coefficient of Reference Voltage
Oscillation Frequency
(∆VADJ/∆T)
VIN=12V, Io=1A, Ta=–40 to +85°C
Conditions
VIN=12V, Io=1A
fo
315
Conditions
30
30
Outflow Current at Low Voltage
High Level Voltage
EN Pin
Low Level Voltage
Inflow Current at Low Voltage
60
60
VIN=12V, Io=0.1 to 3.5A
3.6
6.0
Conditions
VIN=12V
Conditions
VIN=12V, Io=0A, VEN=open
18
Iq(OFF)
SS Pin
385
VIN=8 to 28V, Io=1A
Iq
Quiescent Circuit Current
%
VIN=16V, Io=1A
Conditions
Is
350
VIN=12V, Io=0A, VEN=0V
Conditions
VIN=12V, VSSL=0V
ISSL
5
VC/EH
VIN=12V
Conditions
VIN=12V
Conditions
VEN=0V
VC/EL
5
mV
A
µA
V
2.2
IC/EH
mV
µA
2.8
Conditions
kHz
mA
20
Conditions
V
mV/ °C
90
∆VoLOAD
Overcurrent Protection Starting Current
0.515
Conditions
Conditions
Load Regulation
0.500
0.05
∆VoLINE
Line Regulation
max.
VIN=12V, Io=1A
η
Efficiency
Unit
typ.
V
µA
Error Amplifier Voltage Gain
AEA
1000
V/V
Error Amplifier Transformer Conductance
GEA
800
µA/V
Current Sense Amplifier Impedance
1/GCS
0.35
V/A
Maximum ON Duty
DMAX
92
%
Minimum ON Time
DMIN
100
nsec.
*: Pin 8 is the SS pin. Soft start at power on can be performed with a capacitor connected to this pin.
The SS pin is pulled up to the power supply in the IC, so applying the external voltage is prohibited.
SI-8100QL
8 SS
C5
Soft start
42
ICs
SI-8100QL Series
■External Dimensions (DIP8)
7
6
5
6.5±0.2
8
(Unit : mm)
2
3
4
4.2±0.3
3.4±0.1
9.4±0.3
1.0+0.3
-0.05
7.5±0.5
1
Pin Assignment
1 BS
2 IN
3 SW
4 GND
5 FB
6 COMP
7 EN
8 SS
7.6
1.5+0.3
-0.05
+0.1
0.25-0.
05
3.3±0.2
Plastic Mold Package Type
Flammability: UL 94V-0
Product Mass: Approx. 0.49 g
0.5±0.1
2.54
0.25 M
0° to 15°
0.89 TYP
■Block Diagram
2
IN
Current
Sense
Amp
OSC
P.REG
Boot
REG
OCP
5v_ldo
1
BS
VREF
0.5V
ON
OFF
7
EN
PWM
LOGIC
Drive
3
SW
OVP
TSD
5v_ldo
6
COMP
5
FB
Amp
UVLO
0.5V
4
GND
8
SS
■Typical Connection Diagram
VIN
7
2
IN
1
BS
EN
C4
R1
SI-8105QL
8
C1
SS
GND
COMP
6
C5
C6
OPEN
C3
R3
VO
L1
SW 3
FB 5
D1
GND
VFB
C2
R2
IADJ
GND
C1:10µ F/50V
(Murata: GRM55DB31H106KA87)
C2:22µ F/16V
(Murata: GRM32ER71A226KE20)
C3:560pF
(Murata: GRM18 Type)
C4:10nF
(Murata: GRM18 Type)
C5:10nF
(Murata: GRM18 Type)
L1:10µ H
D1:SPB-G56S (Sanken)
SJPB-L4 (Sanken)
R1:46kΩ (When Vo = 5 V)
R2:5.1kΩ
R3:24kΩ
ICs
43