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부품번호 | AX3106 기능 |
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기능 | PWM Control 3A Step-Down Converter | ||
제조업체 | AXElite | ||
로고 | |||
전체 12 페이지수
AX3106
PWM Control 2A Step-Down Converter
GENERAL DESCRIPTION
AX3106 consists of step-down switching regulator with PWM control. These devise
include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and
etc.
AX3106 provides low-ripple power, high efficiency, and excellent transient
characteristics. The PWM control circuit is able to every the duty ratio linearly form 0 up to
100%. This converter also contains an error amplifier circuit as well as a soft-start circuit
that prevents overshoot at startup. An enable function, an over current protect function and
short circuit protect function are built inside, and when OCP or SCP happens, the operation
frequency will be reduced. Also, an internal compensation block is built in to minimum
external component count.
With the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode
connected externally, these ICs can function as step-down switching regulators. They
serve as ideal power supply units for portable devices when coupled with the SOP-8L
package, providing such outstanding features as low current consumption. Since this
converter can accommodate an input voltage up to 23V, it is also suitable for the operation
via an AC adapter.
FEATURES
- Input voltage:3.6V to 23V
- Output voltage:0.8V to VCC
- Duty ratio:0% to 100% PWM control
- Oscillation frequency:330KHz typ.
- Soft-start (SS), Current Limit (CL), Enable function.
- Thermal Shutdown function.
- Short Circuit Protect (SCP).
- Built-in internal SW P-channel MOS.
- Low ESR output capacitor (Multi-layer chip capacitor (MLCC)) application.
- SOP-8L Pb-Free package.
1/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.2.1 Mar.29, 2011
AX3106
APPLICATION CIRCUIT
1. MLCC
VCC+12V
C2
10uF*2
ON/OFF R4
C3 100K
0.1uF
C6
0.1uF
option
AX3106
1 FB VSS 8
2 EN VSS 7
3 COMP SW 6
4 VCC SW 5
L1
115uH 2
R1
D1 39K
B340
R3 C7
R2
7.5K
4.7k 680pF
VOUT =
VFB
x
(1
+
R1
R2
)
VFB = 0.8 V ; R1 suggest 10K ~ 50K
C1
1nF
VOUT=5V3A
C4 C8
10uF*3 0.1uF
Compensation Capacitor Selection(MLCC)
VIN VOUT
L1 R3 C7
C1
12V 5.0/3.3/2.5V
15uH 4.7K 680pF
1nF
5V 3.3/2.5V
15uH 6.8K 470pF
1nF
2. EL CAP
VCC+12V
ON/OFF R4
C2 C3
100K
470uF 0.1uF
C6
0.1uF
option
AX3106
1 FB VSS 8
2 EN VSS 7
3 COMP SW 6
4 VCC SW 5
R3 C7
3.9k 10nF
L1
115uH 2
R1
D1 30K
B340
R2
5.6K
VOUT =
VFB x
(1 +
R1
R2
)
VFB = 0.8 V ; R2 suggest 0.8K ~ 6.0K
VOUT=5V2A
C1
1nF
C4 C8
470uF 0.1uF
VIN
5-20V
Compensation Capacitor Selection(EL CAP)
VOUT L1 R3 C7
5.0/3.3/2.5/1.8V
15μH
3.9K
10nF
C1
1nF
4/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.2.1 Mar.29, 2011
4페이지 AX3106
Output Capacitor Selection
(EL CAP)
The output capacitor is required to filter the output and provide regulator loop stability. The
important capacitor parameters are; the 100KHz Equivalent Series Resistance (ESR), the RMS
ripples current rating, voltage rating, and capacitance value. For the output capacitor, the ESR
value is the most important parameter. The ESR can be calculated from the following formula.
V I ESR = 0.33A x 130mΩ= 43mV
RIPPLE
L
An aluminum electrolytic capacitor's ESR value is related to the capacitance and its
voltage rating. In most case, higher voltage electrolytic capacitors have lower ESR values. Most
of the time, capacitors with much higher voltage ratings may be needed to provide the low ESR
values required for low output ripple voltage. It is recommended to replace this low ESR
capacitor by using a 330µF low ESR values < 130mΩ.
(MLCC CAP)
A 22µF MLCC capacitor for most applications is sufficient.
RDS (ON) Current Limiting
The current limit threshold is setting by the internal circuit.
VIN
ICL(MIN)
IOUT(MAX)
4V~4.6V
2.5A
1.8A
4.6V~8V
2.8A
2A
8V~20V
3.0A
2A
7/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.2.1 Mar.29, 2011
7페이지 | |||
구 성 | 총 12 페이지수 | ||
다운로드 | [ AX3106.PDF 데이터시트 ] |
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