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| 型号： | SP6136ER1-L |
| 厂商： | Exar Corporation |
| 文件页数： | 13/18页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 16-QFN |
| 标准包装： | 490 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 680kHz |
| 占空比： | 92% |
| 电源电压： | 5 V ~ 24 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： | 16-VFQFN 裸露焊盘 |
| 包装： | 散装 |
| 其它名称： | 1016-1394 |
APPLICATION INFORMATION
ode has high forward voltage and reverse
recovery problems. The reverse recovery of
the body diode causes additional switching
noise when the diode turns off. The Schottky
diode alleviates these sources of noise and
additionally improves efficiency thanks to its
low forward voltage. The reverse voltage
across the diode is equal to input voltage,
and the diode must be able to handle the
peak current equal to the maximum load
current.
The power dissipation of the Schottky diode
is determined by:
The goal of loop compensation is to manipu-
late loop frequency response such that its
gain crosses over 0db at a slope of -20db/
dec. The first step of compensation design
is to pick the loop crossover frequency. High
crossover frequency is desirable for fast
transient response, but often jeopardizes
the system stability. Crossover frequency
should be higher than the ESR zero but
less than 1/5 of the switching frequency.
The ESR zero is contributed by the ESR
associated with the output capacitors and
can be determined by:
P DIODE = 2 ? V F ? I OUT ? T NOL ? F S
where:
T NOL = non-overlap time between GH and GL.
? Z(ESR) =
2 π ? C OUT ? R ESR
? P(LC) =
√
VF = forward voltage of the Schottky diode.
Loop Compensation Design
The open loop gain of the whole system can
be divided into the gain of the error ampli-
fier, PWM modulator, buck converter output
stage, and feedback resistor divider. In or-
der to cross over at the selected frequency
FCO , the gain of the error amplifier has to
compensate for the attenuation caused by
the rest of the loop at this frequency.
The next step is to calculate the complex
conjugate poles contributed by the LC output
filter,
2 π ? L ? C OUT
When the output capacitors are of a Ceramic
Type, the SP6136 Evaluation Board requires
a Type III compensation circuit to give a phase
boost of 180° in order to counteract the effects
of an under damped resonance of the output
filter at the double pole frequency.
Type III Voltage Loop
Compensation
G AMP (s) Gain Block
PWM Stage
G PWM Gain
Block
Output Stage
G OUT (s) Gain
Block
V REF
(Volts)
+
_
(SRz2Cz2+1)(SR1Cz3+1)
SR1Cz2(SRz3Cz3+1)(SRz2Cp1+1)
V IN
V RAMP_PP
(SR ESR C OUT + 1)
[S 2 LC OUT +S(R ESR +R DC ) C OUT +1]
V OUT
(Volts)
Notes: R ESR = Output Capacitor Equivalent Series Resistance.
R DC = Output Inductor DC Resistance.
V RAMP_PP = SP6132 Internal RAMP Amplitude Peak to Peak Voltage.
Condition: Cz2 >> Cp1 & R1 >> Rz3
Output Load Resistance >> R ESR & R DC
Voltage Feedback
G FBK Gain Block
R 2 V REF
V FBK
or
(R 1 + R 2 ) V OUT
(Volts)
Definitions:
R ESR = Output Capacitor Equivalent Series Resistance
Figure 5: SP6136 Voltage Mode
Control Loop with Loop Dynamic
R DC = Output Inductor DC Resistance
V RAMP _ PP = SP6 36 internal RAMP Amplitude Peak to Peak Voltage
Oct 3 -06 Rev L
SP6 36 Synchronous Buck Controller
3
? 2006 Sipex Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6136ER1-L/TR | 功能描述:DC/DC 开关控制器 Synchronous Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| SP6137 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Wide Input, 900KHz Synchronous PWM Controller |
| SP6137CU | 制造商:Exar Corporation 功能描述:SMPS Controller |
| SP6137CU/TR | 制造商:Exar Corporation 功能描述:SMPS Controller |
| SP6137CU-L | 功能描述:开关变换器、稳压器与控制器 Wide Input, 900KHz Synchronous 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 |
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