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参数资料
| 型号： | MAX1531ETJ/V+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 25/33页 |
| 文件大小： | 0K |
| 描述： | IC PS CTRLR MULTI-OUTPUT 32WQFN |
| 标准包装： | 2,500 |
| 应用： | 五路电源监控器 |
| 电源电压： | 4.5 V ~ 28 V |
| 电流 - 电源： | 1.7mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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Multiple-Output Power-Supply Controllers for
LCD Monitors
amplifier g m , the compensation resistor R COMP , the FB
regulation V FB , and the output voltage set point V OUT :
Operating Characteristics is 170mV. The voltage soar
due to finite capacitance and inductor slew rate is
V OUT × ?
? + Δ SC UNDER
?
V UNDER _ AC =
? A VCS × R DS ( ON ) × Δ I LOAD ?
?
V FB × R COMP × g m
155mV, and the voltage overshoot due to the AC load
regulation is 167mV. The total overshoot seen the in the
Typical Operating Characteristics is 200mV.
Compensation Design
The step-down controller of the MAX1530/MAX1531
Use the following to calculate the slope compensation
change during the sag:
uses a peak current-mode control scheme that regu-
lates the output voltage by forcing the required current
Δ SC UNDER = 437 . 5 mV × ? D UNDER -
?
?
V OUT ?
V IN ? ?
through the inductor. The MAX1530/MAX1531 use the
voltage across the high-side MOSFET ’s R DS(ON) to
sense the inductor current. Using the current-sense
amplifier’s output signal and the amplified feedback
where D UNDER is the duty cycle at the valley of the sag,
which is usually 50%.
voltage sensed at FB, the control loop sets the peak
inductor current by:
The actual undershoot is always equal to or bigger than
the worst of V ESR_STEP , V SAG_LC , and V UNDER_AC .
The amplitude of the soar due to the finite output
I PEAK =
(V OUT - V OUT( SET) ) × V FB × A VEA
V OUT ( SET ) × R DS ( ON ) × A VCS
capacitance and inductor slew rate is a function of the
load step, the output capacitor value, the inductor
value, and the output voltage:
where V FB = 1.238V is the FB regulation voltage, A VCS
is the gain of the current-sense amplifier (3.5 typical),
A VEA is the DC gain of the error amplifier (2000 typ),
V SOAR _ LC =
L × ( Δ I LOAD ) 2
2 × C OUT × V OUT
V OUT(SET) is the output voltage set point, and R DS(ON)
is the on-resistance of the high-side MOSFET.
The total DC loop gain (A DC ) is approximately:
The amplitude of the overshoot due to the AC load reg-
ulation is:
A DC =
V FB × R LE × A VEA
V OUT ( SET ) × R DS ( ON ) × A VCS
V OUT × ?
? + Δ SC OVER
?
V OVER _ AC =
SW ?
? ? ? L × f
? || ?
R LE = ?
?
Δ SC OVER = 437 . 5 mV × ? OUT - D OVER ?
? A VCS × R DS ( ON ) × Δ I LOAD ?
?
V FB × R COMP × g m
where Δ SC OVER is the change of the slope compensa-
tion during the overshoot, given by:
? V ?
? V IN ?
R LE is the equivalent load resistance, given by:
V OUT
? I LOAD ( MAX ) ? ? n × D ' - D ?
In the above equation, D’ = 1 - D, n is a factor deter-
mined by the slope compensation m c and the inductor
current ramp m 1 , as shown below:
where D OVER is the duty cycle at the peak of the over-
shoot, which is typically 0%.
n = 1 +
m C
m 1
Similarly, the actual overshoot is always equal to or big-
ger than the worst of V ESR_STEP , V SOAR_LC , and
V OVER_AC .
Given the component values in the circuit of Figure 1,
during a 1.5A step load transient, the voltage step due to
capacitor ESR is negligible. The voltage sag due to finite
The slope compensation of the MAX1530/MAX1531 is
219mV/μs. The inductor current ramp is a function of
the input voltage, output voltage, inductance, high-side
MOSFET on-resistance R DS(ON) , and the gain of the
current-sense amplifier A VCS , and is:
capacitance and inductor slew rate is 81mV, and the
voltage undershoot due to the AC load regulation is
m 1 =
V IN - V OUT
L
× R DS ( ON ) × A VCS
170mV. The total undershoot seen in the Typical
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