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For assistance or to order, call
(800) 531-5782
78ST212
Series
12V 2 AMP POSITIVE STEP-DOWN INTEGRATED SWITCHING REGULATOR
Revised 6/30/98
* High Efficiency > 87% * Wide Input Range * Aluminum Heatsink for Applications with Airflow * Self-Contained Inductor * Short Circuit Protection * Over-Temperature Protection
The 78ST212 is a series of wide input voltage, 3-terminal Integrated Switching Regulators (ISRs). With a surge capability of 3A and an output voltage that is laser trimmed, it is ideal for inductive load applications such as disk drive motors.
Pin-Out Information
Pin
1
Ordering Information
Function
Vin GND Vout
78ST2 XX
Output Voltage 12 = 12.0 Volts
YC
Package Suffix V = Vertical Mount H = Horizontal Mount
Standard Application
Vin
1
2 3
Vout + GND
78ST212
2
3
C1 GND
C2
(For dimensions and PC board layout see Package Style 600.)
C1 = Optional 1F ceramic C2 = Required 100F electrolytic
Specifications
Characteristics (Ta = 25C unless noted) Output Current Input Voltage Range Output Voltage Tolerance Line Regulation Load Regulation Vo Ripple/Noise Transient Response (with 100F output cap) Efficiency Switching Frequency Absolute Maximum Operating Temperature Range Recommended Operating Temperature Range Thermal Resistance Storage Temperature Mechanical Shock Mechanical Vibration Weight
78ST212 SERIES
Symbols Io Vin Vo Regline Regload Vn ttr
Conditions Over Vin range With forced air cooling 0.1 Io 2.0A Over Vin range, Io= 2.0A Ta= 0C to +55C Over Vin range 0.1 Io 2.0A Vin=17V, Io=2.0A, Vo=12V 50% load change Vo over/undershoot Vin=17V, Io=2.0A Over Vin and Io ranges -- Free Air Convection, (40-60LFM) at Vin= 24V, Io=2A Free Air Convection, (40-60LFM) -- Per Mil-STD-883D, Method 2002.3 Per Mil-STD-883D, Method 2007.2, 20-2000 Hz, Soldered in a PC board --
**See Thermal Derating chart.
Min 0.1* 14.5 -- -- -- -- -- -- -- 0.95 -40 -40 -- -40 -- -- --
Typ -- -- 1.0 0.4 0.2 1.0 100 3.0 87 1.0 -- -- 35 -- 500 10 11
Max 2.0 28 2.0 0.8 0.4 -- -- -- -- 1.05 +65 +55** -- +125 -- -- --
Units A V %Vo %Vo %Vo %Vo Sec %Vo % MHz C C C/W C G's G's Grams
o Ta Ta
ja
Ts -- -- --
*ISR will operate down to no load with reduced specifications.
Note: The 78ST212 Series requires a 100F electrolytic or tantalum output capacitor for proper operation in all applications.
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
For assistance or to order, call
(800) 531-5782
78ST212
CHARACTERISTIC DATA
Series
78ST212_ 12.0 VDC
DATA SHEETS
(See Note 1)
Efficiency vs Output Current
100 90
Efficiency (%)
80 70 60 50 40 0.0 0.5 1.0 1.5 2.0
Vin
15V 18V 21V 24V 28V
Iout (A)
Ripple vs Output Current
60 50 40 30 20 10 0 0.0 0.5 1.0 1.5 2.0
Vin
15V 18V 21V 24V 28V
Ripple (mV)
Iout (A)
Thermal Derating (Ta)
2.0
(See Note 2)
60C 70C
1.5
85C
Iout (A)
1.0
0.5
0.0 14 16 18 20 22 24 26 28
Vin (Volts)
Power Dissipation vs Output Current
3.0 2.5 2.0 1.5 1.0 0.5 0.0 0.0 0.5 1.0 1.5 2.0
Vin
15V 18V 21V 24V 28V
PD (Watts)
Iout (A)
Note 1: All data listed in the above graphs, except for derating data, has been developed from actual products tested at 25C. This data is considered typical data for the ISR. Note 2: Thermal derating graphs are developed in free air convection cooling of 40-60 LFM. (See Thermal Application Notes.)
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
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Copyright (c) 1999, Texas Instruments Incorporated

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