TL2575_10 Datasheet, PDF (3/29 Pages) Texas Instruments – 1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATORS

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TL2575, TL2575HV
1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATORS
SLVS638B – MAY 2006 – REVISED JANUARY 2007
FUNCTIONAL BLOCK DIAGRAM
Unregulated
DC Input
V_IN
1
+
C_IN
Internal
Regulator
On/Off
ON/OFF
5
FEEDBACK
4
Fixed-Gain
R2 _{Error Amplifier}
+
_
R1
1 kW
Comparator
+
_
1-A
Driver Switch
OUTPUT ^L1
2
D1
+
C_OUT
1.23-V
Band-Gap
Reference
52-kHz
Thermal Current
Oscillator ^Reset Shutdown
Limit
GND
3
V_OUT
L
O
A
D
3.3 V: R2 = 1.7 kW
5 V: R2 = 3.1 kW
12 V: R2 = 8.84 kW
15 V: R2 = 11.3 kW
ADJ: R1 = Open, R2 = 0 Ω
A. Pin numbers are for the KTT (TO-263) package.
7-V to 40-V
Unregulated
DC Input
+V_IN
1
TL2575-05
FEEDBACK
4
OUTPUT
2
L1
330 µH
3 GND
5 ON/OFF
+
C_IN
100 µF
D1
+
C_OUT
1N5819
330 µF
L2
20 µH
C1 ⁺
100 µF
5-V
Regulated
Output
1-A Load
Optional Output Ripple Filter
A. Pin numbers are for the KTT (TO-263) package.
Figure 1. Typical Application Circuit (Fixed Version)
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