參數(shù)資料
型號: MIC2199
廠商: Micrel Semiconductor,Inc.
英文描述: 300kHz 4mm 】 4mm Synchronous Buck Converter
中文描述: 300kHz的4毫米】4mm的同步降壓轉(zhuǎn)換器
文件頁數(shù): 7/15頁
文件大?。?/td> 222K
代理商: MIC2199
November 2004
7
MIC2199
MIC2199
Micrel
A ramp is added to the amplified current-sense signal to
provide slope compensation, which is required to prevent
unstable operation at duty cycles greater than 50%.
A transconductance amplifier is used for the error amplifier,
which compares an attenuated sample of the output voltage
with a reference voltage. The output of the error amplifier is
the COMP (compensation) pin, which is compared to the
current-sense waveform in the PWM block. When the current
signal becomes greater than the error signal, the comparator
turns off the high-side drive. The COMP pin (pin 1) provides
access to the output of the error amplifier and allows the use
of external components to stabilize the voltage loop.
Current
Sense
Amp
V
B
0
V
B
Error
Amp
V
IN
V
DD
CORRERAMP
COMPWM
RESET
Oscillator
7
VIN
10
HSD
6
BST
12
VSW
11
LSD
8
9
4
5
3
1
COMP
100k
MIC2199
FB
R2
R1
VOUT
CSH
VDD
C
IN
Q2
Q1
D1
D2
C
BST
C
OUT
V
IN
V
OUT
L1
PGND
C
COMP
R
COMP
4.7
μ
F
S
R
Q
PULCONTROL LOGIC AND
R
CS
G
m
= 0.2
×
10
-3
A
V
= 2
V
0.8V
R1
R2
OUT
=
+
1
Reference
Figure 2. PWM Operation
V
DD
0V
0V
0V
0V
0A
V
DD
V
IN
+ V
DD
V
IN
V
SW
Reset
Pulse
V
HSD
V
LSD
I
LOAD
I
L1
Figure 3. PWM-Mode Timing
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參數(shù)描述
MIC2199_10 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:300kHz 4mm × 4mm Synchronous Buck Converter
MIC2199BML 功能描述:IC REG CTRLR BUCK PWM CM 12-MLF RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR)
MIC2199BML TR 功能描述:IC REG CTRLR BUCK PWM CM 12-MLF RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR)
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MIC2199YML EV 功能描述:電源管理IC開發(fā)工具 300KHz 12 Lead Sync Buck Controller - Evaluation Board RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V