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1-1-2 Switching Mode Regulator ICs
STA810M Series Separate Excitation Switching Mode Regulator ICs with Flywheel Diode
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)
Lineup
Part Number STA811M Output Voltage (V) 6.5
Output voltage: 2.5V, 3.3V, 5V, 9V, 12V and adjustable types are projected.
Absolute Maximum Ratings*1
Parameter DC Input Voltage Output Current Power Dissipation*2 Symbol VIN IO PD1 PD2 Tj Tstg Ratings 43 1.5 18.2 (With infinite heatsink) 2.7 (Without heatsink, stand-alone operation) +125 -40 to +125 5.5 37 Unit V A W W C C C/W C/W
Applications
* Power supplies for telecommunication equipment * Onboard local power supplies * OA equipment * For stabilization of the secondary-side output voltage of switching power supplies
Junction Temperature Storage Temperature Thermal Resistance (junction to case) Thermal Resistance (junction to ambient air)
j-c j-a
*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
Ratings Parameter Symbol min. DC Input Voltage Range Output Current Range*2 Operating Junction Temperature Range Operating Temperature Range*2 VIN1 VIN2 IO Tjop Top 8.5 9.5 0 -30 -30 STA811M max. 9.5 40 1.5 +125 +80 V V A C C IO=0 to 1A IO=0 to 1.5A VIN 9.5V Unit Conditions
*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.
Electrical Characteristics
Ratings Parameter Symbol min. Output Voltage Efficiency*1 Oscillation Frequency Line Regulation Load Regulation Temperature Coefficient of Output Voltage Overcurrent Protection Starting Current Low Level Voltage ON/OFF Terminal*2 Outflow Current at Low Voltage VO Conditions 6.37 STA811M typ. 6.5 VIN=28V, IO=1A 83 VIN=28V, IO=1A 125 VIN=28V, IO=1A 40 VIN=10 to 30V, IO=1A 10 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 40 100 max. 6.63
(Ta=25C) Unit
V % kHz mV mV mV/ C A V
Conditions fO Conditions VLine Conditions VLoad Conditions VO/T IS Conditions VSSL ISSL Conditions Iq Conditions Iq(OFF) Conditions
A
mA
Quiescent Circuit Current 1 Quiescent Circuit Current 2
A
*1: Efficiency is calculated from the following formula.
(%) = VO*IO x 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.
STA811M
STA811M
STA811M
7 ON/OFF
7 ON/OFF C3
7 ON/OFF C3
VO. ON/OFF
Soft start
Soft start +VO. ON/OFF
86
ICs
STA810M Series
External Dimensions (SIP8 [STA 8Pin])
40.2
(Unit : mm)
2.30.2
1.7MAX
90.2
SK
a
b
(1)
STA811M
3.150.5
1.20.1 (Measured at the root of pin) 2-(R1)
R-END
0.65 )
1.15+0.2 -0.1 7xP2.540.1=17.78 (Measured at the root) C1.50.5 20.150.3
(3.1)
0.55+0.2 -0.1 4.30.7 (Measured at the tip)
Pin Assignment q SWOUT w GND e VIN r N.C t GND y VOS u ON/OFF i GND Plastic Mold Package Type Flammability: UL 94V-0 Product Mass: Approx. 2.0 g
0.7
0.7
1
2
3
4
5
6
7
8
Plan View
Block Diagram
STA811M
VIN C1 + PReg. ON/OFF 7 + C3 ON/OFF Soft Start Oscillator + - Thermal Protection Reset Latch & Driver Overcurrent Protection 3 VIN
SW OUT
1
L
VOUT +
C2
Di
GND 2
VOS 6
Comparator + -
Error Amp
Reference Voltage GND 5,8
Typical Connection Diagram
L1 VIN 3.VIN 1.SW 6.VOS VOUT
Thermal Derating
20 18
With Infinite Heatsink
2-(R
+ C1
7.ON/OFF
2.GND 5,8.GND
Power Dissipation PD (W)
STA811M
Without Insulating Sheet With Silicone Grease Heatsink: Alminum
16 14 12 10 8 6 50x50x2mm (17.9C/W) 4 2
Without Heatsink (37C/W) 25x50x2mm (25C/W) 100x100x2mm (11.5C/W)
+ C2
C3 GND GND
PD = VO*IO
100 -1
C1: 220 F/50V C2: 470 F/25V C3: 0.47 F/10V (Only when using soft start function) L1: 100 H
0 -25
0
25
50
75
100
125
Ambient Temperature Ta (C)
VO : VIN : IO : :
Output voltage Input voltage Otuput current Efficiency (%)
ICs
87
qSTA810M Series
sTypical Characteristics
Efficiency
100 90
Output Voltage Rise
8
6.70
Output Voltage Fluctuation
Output Voltage VO (V)
80
Output Voltage VO (V)
6
6.60
Efficiency (%)
70 60 50 40 30 0 0.2
VIN=8.5V 20V 28V 40V
VIN=40V 28V
6.50
4 lO=0A 1A 1.5A 2
20V 8.5V
6.40
0.4
0.6
0.8
1.0
1.2
1.4
1.6
0
0
5
10
15
20
25
30
6.30
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
Output Current IO (A)
Intput Voltage VIN (V)
Output Current IO (A)
Overcurrent Protection Characterisitcs
8 8
Thermal Protection
160
Temperature Characteristics
6.65
Efficiency (%) Frequency Freq (kHz)
Output Voltage VO (V)
VIN=8.5V 28V 40V 4
120
Freq
6.55
4
100
VO
6.5
TSD OFF 2
TSD ON
2
80
6.45
0
0
0.5
1
1.5
2
2.5
3
0 50
75
100
125
150
175
200
60 -50
0
50
100
6.4 150
Output Current IO (A)
Ambient Temperature Ta (C)
Ambient Temperature Ta (C)
Output Current VO (A)
6
Output Voltage VO (V)
140
6.6
6
5

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