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參數(shù)資料
| 型號： | TB7101F(T5L1.2,F) |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 1150 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 3 X 3 MM, 0.65 MM PITCH, PLASTIC, SON-8 |
| 文件頁數(shù)： | 2/22頁 |
| 文件大小： | 324K |
| 代理商： | TB7101F(T5L1.2,F) |
TB7101F(T5L1.2,F)/(T5L1.5,F)/(T5L1.8,F)/(T5L2.5,F)/(T5L3.3,F)
2008-04-09
10
Application Circuit Example
Figure 1 TB7101F(T5L*.*,F) Application Circuit Example
Component values (@TB7101F (T5L3.3, F), VIN = 5 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.)
L:
Inductor = 3.3
μH (NP04SB3R3N from Taiyo Yuden Co., Ltd.)
Component values (@TB7101F (T5L1.2, F), VIN = 5 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.)
L:
Inductor = 3.3
μH (NP04SB3R3N from Taiyo Yuden Co., Ltd.)
Component values need to be adjusted, depending on the TB7101F’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 TB7101F 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 TB7101F (T5L3.3, F) and VIN = 5 V, the required inductance can be calculated as follows. Be sure to
select an appropriate inductor, taking the VIN range into account.
PGND
TB7101F (T5L*.*, F)
SGND
GND
VOUT
LX
VFB
C
OUT
GND
VIN
C
IN
C
EN
VIN
L
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