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PDF MIC9130 Data sheet ( Hoja de datos )

Número de pieza MIC9130
Descripción High-Speed Telecom DC-to-DC Controller
Fabricantes Micrel Semiconductor 
Logotipo Micrel Semiconductor Logotipo



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MIC9130
MIC9130
Micrel, Inc.
High-Voltage, High-Speed Telecom DC-to-DC Controller
General Description
The MIC9130 is a current-mode PWM controller that efciently
converts –48V telecom voltages to logic levels. The MIC9130
features a high voltage start-up circuit that allows the device to
be connected to input voltages as high as 180V. The high input
voltage capability protects the MIC9130 from line transients
that are common in telecom systems. The start-up circuitry
also saves valuable board space and simplies designs by
integrating several external components.
The MIC9130 is capable of high speed operation. Typically
the MIC9130 can control a sub-25ns pulse width on the gate
out pin. Its internal oscillator can operate over 2.5MHz, with
even higher frequencies available through synchronisation.
The high speed operation of the MIC9130 is made safe by
the very fast, 34ns response from current sense to output,
minimizing power dissipation in a fault condition.
The MIC9130 allows for the designs of high efciency power
supplies. It can achieve efciencies over 90% at high output
currents. Its low 1.3mAquiescent current allows high efciency
even at light loads.
The MIC9130 has a maximum duty cycle of 50%. For de-
signs requiring a high duty cycle, refer to the MIC9131. The
MIC9130 is available in a 16-pin SOP and 16-pin QSOP
package options. The rated junction temperature range is
from –40°C to +125°C.
Features
• Input voltages up to 180V
• Internal oscillator capable of >2.5MHz operation
• Synchronisation capability to 4MHz
• Current sense delay of 34ns
• Minimum pulse width <25ns
• 90% efciency
• 1.3mA quiescent current
• 1μA shutdown current
• Soft-start
• Resistor programmable current sense threshold
• Selectable soft-start retry
• 4Ω sink, 12Ω source output driver
• Programmable under-voltage lockout
• Constant-frequency PWM current-mode control
• 16-pin SOIC and 16-pin QSOP
Applications
• Telecom power supplies
• Line cards
• ISDN network terminators
• Micro- and pico-cell base stations
• Low power (< 30W) dc-dc converters
Typical Application
VIN
36V to 72V
MBR0540
12V
40V/0.5A
20Ω
N=5
1μF
16V
T1
1M 0.1μF
38.3k
13 1 2 10
N = 20
N=4
Si4800DY
Si4884DY
B330
2.5μH
330μF (x2)
6.3V
20k 7 FB
6 COMP
1.21k 5 SYNC
332k
0.1μF
8 CPWR
3 RBIAS
12 SS
9 VBIAS
OSC
4
MIC9130
OUT 16
FQD10N20
0.2Ω
200V
ComSpleonpseation
ISNS 14
AGND PGND
11 15
332k
0.2Ω
1W
10nF
4.75k
47pF
OPTO
FEEDBACK
1.5MHz DSL Power Supply
VOUT
3.3V @ 4A
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
November 2008
1
M9999-111108

1 page




MIC9130 pdf
MIC9130
Typical Characteristics
Oscillator Frequency
vs. VCC Voltage
2.0
1.5
FOSC (NOM)=200kHz
Rt=9.47K
1.0 Ct=470pF
0.5
0
-0.5
-1.0
-1.5
-2.0 8 9 10 11 12 13 14 15 16 17 18
VCC (V)
Error Amp Reference
Voltage vs. Temperature
2.510
VC C = 10V
2.505 RB IAS= 560K
2.500
2.495
2.490
2.485
2.480
-40 -20 0 20 40 60 80 100120140
TEMPERATURE (°C)
Quiescent Current
vs. VCC Voltage
2.4
2.2
RB IAS= 560K
Rt = 9.47K
2.0 Ct = 470pF
1.8
1.6
1.4
1.2
1.0
8
10 12 14 16
VCC (V)
18
Quiescent Current
vs. RBIAS
3.5
VC C = 10V
3 Rt = 9.53K
Ct = 470pf
2.5 fOSC = 200kHz
2
1.5
1
0 200 400 600 800 1000 1200
RBIAS (kΩ)
November 2008
Oscillator Frequency
vs. Temperature
5
4
3
2
1
0
-1
-2
-3
-4
-5
-40
VC C = 10V
RB IAS= 560K
Rt = 9.47K
Ct = 470pF
0 40 80 120 160
TEMPERATURE (°C)
1.220
Line UVLO Threshold
vs. VCC
1.215
1.210
1.205
1.200
1.195
1.190
1.185
1.180
8 9 10 11 12 13 14 15 16 17 18
VCC (V)
Quiescent Current
vs. Temperature
1.4
1.39 VC C = 10V
1.38
1.37
1.36
RB IAS= 560K
Rt = 9.47K
Ct = 470pF
1.35
1.34
1.33
1.32
1.31
1.3-40 -20 0 20 40 60 80 100120140
TEMPERATURE (°C)
ISNS to Gate Output Delay
90 vs. RBIAS
80
70
60
50
40
30
20
10
00 200 400 600 800 1000 1200
RBIAS (kΩ)
5
Micrel, Inc.
Error Amp Reference
Voltage vs. VCC Voltage
2.502
RB IAS= 560K
2.501
2.500
2.499
8 9 10 11 12 13 14 15 16 17 18
VCC (V)
Line UVLO Threshold
vs. Temperature
1.24
VC C=10V
1.23 RB IAS=560K
1.22
1.21
1.2
1.19
1.18
-40
0 40 80 120 160
TEMPERATURE (°C)
Quiescent Current
vs. Frequency
10
9 Ct = 470pF
8
7
6
5
4
3
Ct = 120pF
2
1
00 200 400 600 800 1000
GATE DRIVE FREQUENCY (kHz)
ISNS to Gate Output Delay
vs. Overdrive
350
300
250
200
150
100
RB IAS=560K
RB IAS=360K
50
0 RB IAS=160K
OVERDRIVE (mV)
M9999-111108

5 Page





MIC9130 arduino
MIC9130
MIC9130
SET
SQ
5V
4μA
12 SS
Micrel, Inc.
VCC 2
1.21V
VCC
UVLO
R /Q
RESET
VIN
R1
R2
AGND 11
UVLO 13
LINE
UVLO
UVLO
16
OUT
15
PGND
Figure 4: UVLO and Soft Start Circuits
VCC 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:
VLINE_ON = VTHRESHOLD
×
R1+ R2
R2
where: VTHRESHOLD is the voltage level of the internal
comparator reference, typically 1.21V.
The line hysteresis is equal to:
VHYSTERESIS=
VHYST
×
R1+ R2
R2
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:
V LINE_OFF= V LINE_ON VHYTERESIS=
( )VTHRESHOLD VHYST
×
R1+ R2
R2
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 ROSC from
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 = 0.92 ×R t × Ct
Discharging
tDISCHARGE 40 × C t
November 2008
11
M9999-111108

11 Page







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