Datasheet

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