參數(shù)資料
型號： S-8355Q34BD-OWT-TF
元件分類： 穩(wěn)壓器
英文描述： 0.08 A SWITCHING CONTROLLER, 690 kHz SWITCHING FREQ-MAX, PDSO6
封裝： SNB-6
文件頁數(shù)： 24/77頁
文件大?。?/td> 836K
代理商： S-8355Q34BD-OWT-TF
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series
Rev.7.0_00
Seiko Instruments Inc.
30
1. Inductor
The inductance value (L value) has a strong influence on the maximum output current (IOUT) and efficiency (η).
Figure 17 shows the relationship between the IOUT and η dependency on L of S-8355/56/57/58 series.
F, G, H, J, L and M types
CDRH6D28, VOUT = 5.0 V, VIN = 3.0 V
Recommended range
IOUT
η
4.7
47
L value (
μH)
Efficiency
decreases
IOUT decreases
IPK increases
Coil size :
smaller
Efficiency
decreases
IOUT decreases
IPK decreases
Coil size : bigger
Figure 17 L Value vs. IOUT Characteristics, L Value vs. η Characteristics
The peak current (IPK) increases by decreasing L value and the stability of the circuit improves and IOUT increases. If L
value is decreased, the efficiency falls causing a decline in the current drive capacity for the switching transistor, and
IOUT decreases.
The loss of IPK by the switching transistor decreases by increasing L value and the efficiency becomes maximum at a
certain L value. Further increasing L value decreases the efficiency due to the loss of the direct current resistance of
the coil. IOUT also decreases.
A higher oscillation frequency allows selection of a lower L value, making the coil smaller.
The recommended inductances are a 22 to 100
μH for B, E, and K types, a 4.7 to 47 μH for F, G, H, J, L, and M
types, 3.0 to 22
μH for N, P and Q types.
Be careful of the allowable inductor current when choosing an inductor. Exceeding the allowable current of the
inductor causes magnetic saturation, much lower efficiency and destruction of the IC chip due to a large current.
Choose an inductor so that IPK does not exceed the allowable current. IPK in discontinuous mode is calculated by the
following equation:
L
f
)
V
(
I
2
I
OSC
IN
D
OUT
PK
+
=
(A)
(17)
fosc = oscillation frequency, VD 0.4 V.
2. Diode
Use an external diode that meets the following requirements :
Low forward voltage : VF < 0.3 V
High switching speed : 500 ns max.
Reverse voltage :
VOUT + VF or more
Current rate :
IPK or more
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相關代理商/技術參數(shù)
參數(shù)描述
S-8355Q34BD-OWT-TFG 制造商:Seiko Instruments Inc (SII) 功能描述:DC DC CNTRLR SGL-OUT W/ PWM DC TO DC CNTRLR/STEP UP 10V 6PIN - Tape and Reel 制造商:Seiko Instruments Inc (SII) 功能描述:IC REG CTRLR BST PWM 6-SNB
S-8355Q34MC-OWTT2G 功能描述:DC/DC 開關控制器 Step-Up SWR PWM 25.9uA Iq RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
S-8355Q45MC-OXET2G 功能描述:DC/DC 開關控制器 STEP-UP SWR PWM 25.9UA IQ RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
S-8355Q50BD-OXJ-TFG 制造商:Seiko Instruments Inc (SII) 功能描述:DC DC CNTRLR SGL-OUT W/ PWM DC TO DC CNTRLR/STEP UP 10V 6PIN - Tape and Reel 制造商:Seiko Instruments Inc (SII) 功能描述:IC REG CTRLR BST PWM 6-SNB
S-8355Q50MC-OXJT2G 功能描述:DC/DC 開關控制器 Step-Up SWR PWM 25.9uA Iq RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
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