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STA811M Arkusz danych(PDF) 1 Page - Sanken electric

Numer części STA811M
Szczegółowy opis  Separate Excitation Switching Mode Regulator ICs with Flywheel Diode
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Producent  SANKEN [Sanken electric]
Strona internetowa  http://www.sanken-ele.co.jp/en
Logo SANKEN - Sanken electric

STA811M Arkusz danych(HTML) 1 Page - Sanken electric

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86
ICs
■Features
• Output current: 1.5A
• High efficiency: TYP83% (STA811M)
• Built-in flywheel diode (schottky-barrier diode)
• Requires only 3 discrete components: output
coil, input and output capacitors
• Phase correction and output voltage
adjustment performed internally
• Built-in reference oscillator (125kHz)
• Built-in foldback-overcurrent and thermal
protection circuits
• Built-in ON/OFF circuit (soft start available)
■Applications
•Power supplies for telecommunication
equipment
• Onboard local power supplies
•OA equipment
•For stabilization of the secondary-side output
voltage of switching power supplies
■Lineup
Part Number
Output Voltage (V)
STA811M
6.5
■Absolute Maximum Ratings*1
Unit
V
A
W
W
°C
°C
°C/W
°C/W
Ratings
43
1.5
18.2 (With infinite heatsink)
2.7 (Without heatsink, stand-alone operation)
+125
–40 to +125
5.5
37
Symbol
VIN
IO
PD1
PD2
Tj
Tstg
θ j-c
θ j-a
Parameter
DC Input Voltage
Output Current
Power Dissipation*2
Junction Temperature
Storage Temperature
Thermal Resistance (junction to case)
Thermal Resistance (junction to ambient air)
Output voltage: 2.5V, 3.3V, 5V, 9V, 12V and adjustable types are projected.
*1: Absolute maximum ratings show the destructive limit. No parameter should exceed the ratings in transient or normal
operations.
*2: Limited by thermal protection.
■Recommended Operating Conditions*1
Parameter
DC Input Voltage Range
Output Current Range*2
Operating Junction Temperature Range
Operating Temperature Range*2
Symbol
VIN1
VIN2
IO
Tjop
Top
Conditions
IO=0 to 1A
IO=0 to 1.5A
VIN
≥ 9.5V
*1: Recommended operating conditions show operating conditions required for normal circuit function described in the electrical characteristics.
These conditions must be followed in actual use.
*2: Limited by Ta-PD characteristics.
Ratings
STA811M
min.
max.
8.5
9.5
9.5
40
0
1.5
–30
+125
–30
+80
Unit
V
V
A
°C
°C
■Electrical Characteristics
Unit
V
%
kHz
mV
mV
mV/
°C
A
V
µA
mA
µA
Parameter
Output Voltage
Efficiency*1
Oscillation Frequency
Line Regulation
Load Regulation
Overcurrent Protection
Starting Current
ON/OFF
Low Level Voltage
Terminal*2
Outflow Current
at Low Voltage
Quiescent Circuit
Current 1
Quiescent Circuit
Current 2
Symbol
VO
Conditions
η
Conditions
fO
Conditions
VLine
Conditions
VLoad
Conditions
∆VO/∆T
IS
Conditions
VSSL
ISSL
Conditions
Iq
Conditions
Iq(OFF)
Conditions
(Ta=25
°C)
Ratings
STA811M
min.
typ.
max.
6.37
6.5
6.63
VIN=28V, IO=1A
83
VIN=28V, IO=1A
125
VIN=28V, IO=1A
40
100
VIN=10 to 30V, IO=1A
10
40
VIN=28V, IO=0.2 to 1A
±0.5
1.6
VIN=28V
0.5
100
VSSL=0V
7
VIN=28V, IO=0A
200
VIN=28V, VON/OFF=0.3A
*1: Efficiency is calculated from the following formula.
η (%) = V
O
·IO × 100
VIN·IIN
*2: Pin 7 is the ON/OFF pin. Soft start at power on can be performed by connecting a
capacitor to this pin. The output can also be turned ON/OFF with this pin. The output is
stopped by setting the 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 used, leave it open.
Separate Excitation Switching Mode Regulator ICs with Flywheel Diode
STA810M Series
Temperature Coefficient of Output Voltage
STA811M
STA811M
ON/OFF
7
ON/OFF
7
ON/OFF
C3
C3
7
VO. ON/OFF
Soft start
Soft start
+VO. ON/OFF
STA811M
1-1-2 Switching Mode Regulator ICs


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