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参数资料
| 型号： | SIP12107DMP-T1-GE3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 12/19页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ QFN33-16L |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 0.6V |
| 输入电压： | 2.8 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz ~ 4MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | * |
| 包装： | 标准包装 |
| 供应商设备封装： | 16-QFN（3x3） |
| 其它名称： | SIP12107DMP-T1-GE3DKR |
SiP12107
www.vishay.com
V current
v comp
PWM
Fixed ON-time
Fig. 5 - CM-COT Operational Principle
Vishay Siliconix
The following equation illustrates the relationship between
on-time, V IN , V OUT and R ON value:
Once on-time is set, the pseudo constant frequency is then
determined by the following equation:
T ON = R ON x K x
V OUT
V IN
, where K = 9.6 x 10 -12 a con s tant s et internally
V OUT
D V IN
s w = = =
T ON V OUT
x R ON x K
V IN
1
R ON x K
H fb = ------------------------------
? 1 + sR O C COMP ?
? 1 + sC O R load ?
H mod (s) = ----------------------------------- x --------------------------------------------------------------
? 1 + sR O C COMP ?
? 1 + sC O R load ?
H mod (s) = ------------------------------ x ------------------------------------------------------------------------- gm x ----------------------------------- x --------------------------------------------------------------
Loop Stability and Compensator Design
Due to the nature of current mode control, a simple RC network (type II compensator) is required between COMP and A GND for
loop stability and transient response purpose. General concept of this loop design is to introduce a single zero through the
compensator to determine the crossover frequency of overall close loop system.
The overall loop can be broken down into following segments.
Output feedback divider transfer function H fb :
R fb2
R fb1 x R fb2
Voltage compensator transfer function G COMP (s):
R O x ? 1 + sC COMP R COMP ?
G COMP (s) = ------------------------------------------------------------------------- gm
Modulator transfer function H mod (s):
1 R load x ? 1 + sC O R ESR ?
AV 1 x R DS(on)
The complete loop transfer function is given by:
R fb2 R O x ? 1 + sC COMP R COMP ? 1 R load x ? 1 + sC O R ESR ?
R fb1 x R fb2 AV 1 x R DS(on)
When:
C COMP = Compensation capacitor
R DS(on) = LS switch resistance
R COMP = Compensation resistor
R fb1
= Feedback resistor connect to LX
gm
R load
C O
= Error amplifier transconductance
= Load resistance
= Output capacitor
R fb2
R O
AV 1
= Feedback resistor connect to ground
= Output impedance of error amplifier = 20 M ?
= Voltage to current gain = 3
S12-0412-Rev. B, 20-Feb-12
12
Document Number: 63395
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
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