- 您现在的位置：买卖IC网 > PDF目录1809 > IR3622AMPBF (International Rectifier)IC REG CTRLR BUCK PWM VM 32MLPQ PDF资料下载
参数资料
| 型号： | IR3622AMPBF |
| 厂商： | International Rectifier |
| 文件页数： | 21/33页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 32MLPQ |
| 标准包装： | 73 |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 600kHz |
| 占空比： | 84% |
| 电源电压： | 4.5 V ~ 14.5 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 包装： | 管件 |
| 配用： | IRDC3622S-ND - BOARD EVALUATION W/IR3622MPBF IRDC3622D-ND - BOARD EVAL W/IR3622MPBF DUAL OUT |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页当前第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页
IR3622AMPbF
Feedback Compensation
The IR3622A is a voltage mode controller; the
control loop is a single voltage feedback path
F ESR =
V OUT
1
2 ? π * ESR * C o
- - - -(15)
including error amplifier and error comparator. To
achieve fast transient response and accurate
output regulation, a compensation circuit is
necessary. The goal of the compensation
network is to provide a closed loop transfer
function with the highest 0dB crossing frequency
and adequate phase margin (greater than 45 o ).
The output LC filter introduces a double pole, –
40dB/decade gain slope above its corner
R 6 Fb
R 5
V REF
Gain(dB)
E/A
Comp
C 9
R 4
Ve
C POLE
resonant frequency, and a total phase lag of 180 o
(see figure 19). The resonant frequency of the LC
filter expressed as follows:
H(s) dB
F Z
F LC =
1
2 ? π L o ? C o
- - - -(14)
Frequency
Fig. 20: TypeII compensation network
Figure 19 shows gain and phase of the LC filter.
Since we already have 180 o phase shift just from
the output filter, the system risks being unstable.
and its asymptotic gain plot
The transfer function (Ve/Vo) is given by:
H ( s ) = ? ? g m *
R 5 ? 1 + sR 4 C 9
R 5 + R 6 ? ?
Gain
0dB
Phase
0
?
?
? *
sC 9
- - - -(16)
-40dB/decade
The (s) indicates that the transfer function varies
as a function of frequency. This configuration
introduces a gain and zero, expressed by:
[ H ( s ) ] = ? g m
? * R 4
-180
F LC Frequency F LC Frequency
Fig. 19: Gain and Phase of LC filter
?
*
R 5 ?
R 5 + R 6 ? ?
- - - -(17)
The IR3622A’s error amplifier is a differential-
input transconductance amplifier. The output is
F z =
1
2 π * R 4 * C 9
- - - -(18)
R 4 =
V osc * F o * F ESR * ( R 5 + R 6 )
available for DC gain control and AC phase
compensation.
The E/A can be compensated either in type II or
type III compensation. When it is used in type II
compensation the transconductance properties of
the E/A become evident and can be used to
cancel one of the output filter poles. This will be
accomplished with a series RC circuit from Comp
pin to ground as shown in figure 20.
This method requires that the output capacitor
has enough ESR to satisfy stability requirements.
In general the output capacitor’s ESR generates
a zero typically at 5kHz to 50kHz which is
essential for an acceptable phase margin. The
ESR zero of the output capacitor expressed as
follows:
www.irf.com
The gain is determined by the voltage divider and
E/A’s transconductance gain.
First select the desired zero-crossover frequency
(Fo):
F o > F ESR and F o ≤ ( 1/5 ~ 1/10 ) * F s
Use the following equation to calculate R 4 :
- - - -(19)
V in * F LC 2 * R 5 * g m
Where:
V in = Maximum Input Voltage
V osc = Oscillator Ramp Voltage
F o = Crossover Frequency
F ESR = Zero Frequency of the Output Capacitor
F LC = Resonant Frequency of the Output Filter
g m = Error Amplifier Transconductance
21
相关PDF资料 |
PDF描述 |
|---|---|
| IR3622MTRPBF | IC REG CTRLR BUCK PWM VM 32MLPQ |
| IR3623MTRPBF | IC REG CTRLR BUCK PWM VM 32MLPQ |
| IR3624MPBF | IC REG CTRLR BUCK PWM VM 10-MLPD |
| IR3628MPBF | IC CTLR PWM BUCK SYNC 12-MLPD |
| IR3629AMTRPBF | IC CTLR PWM SYNC BUCK 12-MLPD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3622AMTRPBF | 功能描述:开关变换器、稳压器与控制器 2 CH OR 2 PHASE SYNC PWM CNTRLR RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| IR3622MPBF | 功能描述:IC REG CTRLR BUCK PWM VM 32MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| IR3622MTRPBF | 功能描述:开关变换器、稳压器与控制器 HI FREQ 2-PHASE Single or Dual SYNCH RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| IR3623MPBF | 功能描述:IC REG CTRLR BUCK PWM VM 32MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| IR3623MPBF_1 | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGH FREQUENCY 2-PHASE, SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP DOWN CONTROLLER WITH OUTPUT TRACKING AND SEQUENCING |
发布紧急采购，3分钟左右您将得到回复。