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参数资料
| 型号： | TB7102AF(TE85L,F) |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 1150 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | 3 X 3 MM, 0.65 MM PITCH, PLASTIC, SON-8 |
| 文件页数： | 14/17页 |
| 文件大小： | 249K |
| 代理商： | TB7102AF(TE85L,F) |
TB7102AF
2008-05-22
6
Application Circuit Example
Figure 1 TB7102AF Application Circuit Example
Component values (@VIN = 5 V, VOUT = 3.3 V, Ta = 25°C)
These values are presented only as a guide.
CIN:
Input filter capacitor = 10
μF
(ceramic capacitor: GRM21BB30J106K from Murata Manufacturing Co., Ltd.)
COUT: Output filter capacitor = 10 μF
(ceramic capacitor: GRM21BB30J106K from Murata Manufacturing Co., Ltd.)
RFB1: Output voltage setting resistor = 7.5 kΩ
RFB2: Output voltage setting resistor = 2.4 kΩ
L:
Inductor = 3.3
μH (NP04SB3R3N from Taiyo Yuden Co., Ltd.)
Component values (@VIN = 5 V, VOUT = 1.2 V, Ta = 25°C)
These values are presented only as a guide.
CIN:
Input filter capacitor = 10
μF
(ceramic capacitor: GRM21BB30J106K from Murata Manufacturing Co., Ltd.)
COUT: Output filter capacitor = 22 μF
(ceramic capacitor: GRM31CB30J226K from Murata Manufacturing Co., Ltd.)
RFB1: Output voltage setting resistance = 1.2 kΩ
RFB2: Output voltage setting resistance = 2.4 kΩ
L:
Inductor = 3.3
μH (NP04SB3R3N from Taiyo Yuden Co., Ltd.)
Component values need to be adjusted, depending on the TB7102AF’s input/output conditions and the board layout.
Application Notes
Inductor Selection
The inductance required for inductor L can be calculated as follows:
IN
OUT
L
osc
OUT
IN
V
I
f
V
L
Δ
=
(1)
VIN:
Input voltage (V)
VOUT:
Output voltage (V)
fosc:
Oscillation frequency
= 1 MHz (typ.)
ΔIL:
Inductor ripple current (A)
*: Generally,
ΔIL should be set to approximately 30% of the maximum output current. Since the maximum output
current of the TB7102AF is 1 A,
ΔIL should be 0.3 A or so. Therefore, the inductor should have a current rating
greater than the peak output current of 1.15 A. If the inductor current rating is exceeded, the inductor becomes
saturated, leading to an unstable DC-DC converter operation.
When VIN = 5 V and VOUT = 3.3 V, the required inductance can be calculated as follows. Be sure to select an
appropriate inductor, taking the VIN range into account.
PGND
TB7102AF
SGND
GND
VOUT
R
FB2
R
FB1
LX
VFB
C
OUT
GND
VIN
C
IN
C
EN
VIN
L
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