MIC9130 Datasheet, PDF (1/19 Pages) Micrel Semiconductor – High-Voltage, High-Speed Telecom DC-to-DC Controller

MIC9130
MIC9130
Micrel, Inc.
High-Voltage, High-Speed Telecom DC-to-DC Controller
General Description
The MIC9130 is a current-mode PWM controller that efficiently
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 simplifies 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 efficiency power
supplies. It can achieve efficiencies over 90% at high output
currents. Its low 1.3mA quiescent current allows high efficiency
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% efficiency
• 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
T1
1µF
16V
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
Slope
Compensation
ISNS ¹⁴
332k
AGND PGND
11
15
0.2Ω
1W
10nF
4.75k
47pF
OPTO
FEEDBACK
VOUT
3.3V @ 4A
1.5MHz DSL Power Supply
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
April 2005
1
M9999-040805