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| 型号： | TL2575-15IN |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 4 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封装： | ROHS COMPLIANT, PLASTIC, DIP-16 |
| 文件页数： | 9/29页 |
| 文件大小： | 1019K |
| 代理商： | TL2575-15IN |
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BUCK REGULATOR DESIGN PROCEDURE
1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATORS
SLVS638B – MAY 2006 – REVISED JANUARY 2007
PROCEDURE (Fixed Output)
EXAMPLE (Fixed Output)
Known:
VOUT = 3.3 V, 5 V, 12 V, or 15 V
VOUT = 5 V
VIN(Max) = Maximum input voltage
VIN(Max) = 20 V
ILOAD(Max) = Maximum load current
ILOAD(Max) = 1 A
1. Inductor Selection (L1)
A. From Figure 15 through Figure 18, select the appropriate inductor A. From Figure 16 (TL2575-05), the intersection of 20-V line and
code based on the intersection of VIN(Max) and ILOAD(Max).
1-A line gives an inductor code of L330.
B. From Table 2, choose the appropriate inductor based on the
B. L330
→ L1 = 330 H
inductor code. Parts from three well-known inductor manufacturers
Choose from:
are given. The inductor chosen should be rated for operation at
34042 (Schott)
52-kHz and have a current rating of at least 1.15
× I
LOAD(Max) to
PE-52627 (Pulse Engineering)
allow for the ripple current. The actual peak current in L1 (in normal
operation) can be calculated as follows:
RL1952 (Renco)
IL1(pk) = ILOAD(Max) + (VIN – VOUT) × ton/2L1
Where ton = VOUT/VIN× (1/fosc)
2. Output Capacitor Selection (COUT)
A. The TL2575 control loop has a two-pole two-zero frequency
A. COUT = 100-F to 470-F, standard aluminum electrolytic
response. The dominant pole-zero pair is established by COUT and
L1. To meet stability requirements while maintaining an acceptable
output ripple voltage (Vripple ≈ 0.01 × VOUT), the recommended range
for a standard aluminum electrolytic COUT is between 100 F and
470
F.
B. COUT should have a voltage rating of at least 1.5 × VOUT. But if a
B. Although a COUT rated at 8 V is sufficient for VOUT = 5 V, a
low output ripple voltage is desired, choose capacitors with a
higher-voltage capacitor is chosen for its typically lower ESR (and
higher-voltage ratings than the minimum required, due to their
hence lower output ripple voltage)
→ Capacitor voltage
typically lower ESRs.
rating = 20 V.
3. Catch Diode Selection (D1) (see Table 1)
A. In normal operation, the catch diode requires a current rating of
A. Pick a diode with 3-A rating.
at least 1.2
× I
LOAD(Max). For the most robust design, D1 should be
rated to handle a current equal to the TL2575 maximum switch peak
current; this represents the worst-case scenario of a continuous
short at VOUT.
B. The diode requires a reverse voltage rating of at least
B. Pick 30-V rated Schottky diode (1N5821, MBR330, 31QD03, or
1.25
× V
IN(Max).
SR303) or 100-V rated Fast Recovery diode (31DF1, MURD310, or
HER302).
4. Input Capacitor (CIN)
An aluminum electrolytic or tantalum capacitor is needed for input
CIN = 100 F, 25 V, aluminum electrolytic
bypassing. Locate CIN as close to the VIN and GND pins as
possible.
17
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