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參數(shù)資料
| 型號： | MIC9130YQSTR |
| 廠商： | MICREL INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 2500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | LEAD FREE, QSOP-16 |
| 文件頁數(shù)： | 3/19頁 |
| 文件大?。?/td> | 251K |
| 代理商： | MIC9130YQSTR |
November 2008
11
M9999-111108
MIC9130
Micrel, Inc.
V
CC Undervoltage Lockout
The VCC voltage is internally divided down and compared to
a 1.21V internal bandgap reference. As VCC rises above the
turn-on threshold, it disables the Vcc undervoltage lockout
circuit. Once above the turn-on threshold, hysteresis prevents
the lockout circuit from disabling the IC until the VCC voltage
falls below the lower threshold.
Line Undervoltage Circuit (UVLO)
The line voltage is monitored by an external resistor divider
and fed into the negative input of the line UVLO comparator.
As the comparator trip point is exceeded, the line UVLO circuit
is disabled. Hysteresis built into the comparator prevents the
circuit from toggling on an off in the presence of noise or a
high input line impedance.
The line voltage turn-on trip point is:
VV
R2
R1 R2
LINE_ON
THRESHOLD
=×
+
where: VTHRESHOLD is the voltage level of the internal
comparator reference, typically 1.21V.
The line hysteresis is equal to:
VV
R1 R2
R2
HYSTERESIS
HYST
=×
+
where: VHYST is the internal hysteresis level, typically
75mV.
VHYSTERESIS is the hysteresis of the line input
voltage
The MIC9130 will be disabled when the line voltage drops
back down to:
VV
V
VV
R2
R1 R2
LINE_OFF
LINE_ON
HYTERESIS
THRESHOLD
HYST
=
=
()× +
Enable
A low level on the enable pin turns off all the functions of the
MIC9130 and places it in a low quiescent current state. The
output driver is in a low state. When the enable pin is pulled
high, the MIC9130 goes through its normal start up sequence
including undervoltage lock out and soft start. When not used,
the pin should be connected to VCC.
Oscillator Block
An external resistor and capacitor set the oscillator frequency.
The MIC9130 contains an internal divide-by-two circuit that
limits the maximum duty cycle at the gate drive to 50%.
The oscillator frequency for the MIC9130 is twice the output
switching frequency.
Oscillator Pin
The operation of the oscillator is shown in Figure 5. The volt-
age waveform at the OSC pin is a sawtooth whose amplitude
increases as capacitor Cosc is charged up through ROSCfrom
the 5V bias. When the OSC pin voltage reaches the internal
comparator upper threshold, COSC is quickly discharged to
zero volts by an internal MOSFET. After a brief delay, typi-
cally 75ns, the internal MOSFET is turned off and the COSC
charges, repeating the cycle. Figure 5 show the relationship
between the oscillator and gate drive waveforms. The delays
in the IC force the duty cycle of the gate drive signal to be
slightly less than 50% duty cycle (typically 48%).
For VBIAS = 5V and a peak oscillator waveform voltage of
3V, the design equations simplify to:
Charging
tCHARGE
tt
RC
=×
×
092
.
Discharging
tC
DISCHARGE
t
≈
×
40
MIC9130
S
SET
RESET
R
Q
/Q
LINE
UVLO
VCC
UVLO
VCC
AGND
VIN
UVLO
R1
1.21V
R2
2
11
13
PGND
15
OUT
16
SS
4μA
5V
12
Figure 4: UVLO and Soft Start Circuits
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| MIC9131 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:High-Voltage, High-Speed Telecom |
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| MIC9131BM | 功能描述:IC CTRLR DC-DC PWM HV HS 16-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
| MIC9131BM TR | 功能描述:IC CTRLR DC-DC PWM HV HS 16-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
| MIC9131BQS | 功能描述:IC CTRLR DC-DC PWM HV HS 16-QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
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