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PDF UP6101 Data sheet ( Hoja de datos )
| Número de pieza | UP6101 | |
| Descripción | 5V/12V Synchronous-Rectified Buck Controller | |
| Fabricantes | uPI Semiconductor | |
| Logotipo |  |
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uP6101
5V/12V Synchronous-Rectified
Buck Controller
General Description
Features
The uP6101 is a compact synchronous-rectified buck
controller specifically designed to operate from 5V or 12
supply voltage and to deliver high quality output voltage as
low as 0.6V (uP6101A) or 0.8V (uP6101B/C). This (P)SOP-
8 device operates at fixed 300kHz (uP6101A/B) or 200kHz
(uP6101C) frequency and provides an optimal level of
integration to reduce size and cost of the power supply.
This controller integrates internal MOSFET drivers that
support 12V+12V bootstrapped voltage for high efficiency
power conversion. The bootstrap diode is built-in to simplify
the circuit design and minimize external part count.
Other features include internal softstart, under voltage
protection, over current protection and shutdown function.
With aforementioned functions, this part provides
customers a compact, high efficiency, well-protected and
cost-effective solutions. This part comes to SOP-8 and
PSOP-8 packages.
Applications
Power Supplies for Microprocessors or
Subsystem Power Supplies
Cable Modems, Set Top Boxes, and DSL
Modems
Industrial Power Supplies; General Purpose
Supplies
5V or 12V Input DC-DC Regulators
Low-Voltage Distributed Power Supplies
Operates from 5V or 12V Supply Voltage
3.3V to 12V VIN Input Range
0.6V or 0.8V to 80% of VIN Output Range
0.6V or 0.8V Internal Reference
1.5% Over Line Voltage and Temperature
Simple Single-Loop Control Design
Voltage-Mode PWM Control
Fast Transient Response
High-Bandwidth Error Amplifier
0% to 80% Duty Cycle
Lossless, Programmable Overcurrent Protection
Uses Lower MOSFET RDS(ON)
300/200kHz Fixed Frequency Oscillator
Internal SoftStart
Integrated Boot Diode
Ordering Information
Order Number Package
Remark
uP6101AS8
SOP-8
0.6V reference voltage;
300kHz switching frequency
uP6101BS8 SOP-8
uP6101BS8-A SOP-8
uP6101BU8 PSOP-8
0.8V reference voltage;
300kHz switching frequency
uP6101CSA8 SOP-8
0.8V reference voltage;
200kHz switching frequency
Note: uPI products are compatible with the current IPC/
JEDEC J-STD-020 and RoHS requirements. They are 100%
matte tin (Sn) plating and suitable for use in SnPb or Pb-
free soldering processes.
Pin Configuration & Typical Application Circuit
BOOT
UGATE
GND
LGATE
BOOT
UGATE
GND
LGATE
18
27
36
45
SOP-8
18
27
3 GND 6
45
PSOP-8
PHASE
COMP/EN
FB
VCC
Disable
Enable
PHASE
COMP/EN
FB
VCC
1uF
VCC
5
7 1 BOOT
2 UGATE
8 PHASE
FB
6
4 LGATE
3
GND
VIN
VOUT
uPI Semiconductor Corp., http://www.upi-semi.com
Rev. F01, File Name: uP6101-DS-F0101
1
Free Datasheet http://www.datasheet4u.net/
1 page  
uP6101
internal SS and ramps up to its final level during T3 and T4.
At T4, the reference voltage VREF takes over the behavior
of the error amplifier as the internal SS crosses VREF. The
internal SS keeps ramping up and stay at 4.2V at T5, where
the uP6101A asserts the end of softstart cycle.
Ramp
VREF
COMP/EN
SS
VOUT
Functional Description
VIN
5V/Div
VOUT
0.5V/Div
LGATE
10V/Div
Ix 1A/Div
T1 T2
T3
T4
T5
Time 1ms/Div
COMP
0.5V/Div
VOUT
0.5V/Div
LGATE
10V/Div
Time 1ms/Div
Figure 2. Softstart Behavior of uP6101A.
Power Input Detection
The uP6101 detects PHASE voltage for the present of power
input when the UGATE turns on the first time. If the PHASE
voltage does not exceed 2.0V when the UGATE turns on,
the uP6101 asserts that power input in not ready and stops
the softstart cycle. However, the internal SS continues
ramping up to VDD. Another softstart is initiated after SS
ramps up to VDD. The hiccup period is about 8ms. Figure
3 shows the start up interval where VIN does not present
initially.
Figure 3. Softstart where VIN does not Present Initially.
Output Voltage Selection
The output voltage can be programmed to any level between
the 0.6V internal reference (0.8V for uP6101B/C), up to
the 80% of VIN supply. The lower limitation of output voltage
is caused by the internal reference. The upper limitation of
the output voltage is caused by the maximum available
duty cycle (80% typical). This is to leave enough time for
overcurrent detection. Output voltage out of this range is
not allowed.
An voltage divider sets the output voltage (refer to the
Typical Application Circuit on page 1 for detail). In real
applications, choose R1 in 100Ω ~ 10kΩ range and choose
appropriate R2 according to the desired output voltage.
VOUT
=
VREF
×
R1+ R2
R2
=
0.6V
×
R1+ R2
R2
uP6101A
VOUT
=
VREF
×
R1+ R2
R2
=
0.8V ×
R1+ R2
R2
uP6101B/C
Overcurrent Protection (OCP)
The uP6101 detects voltage drop across the lower MOSFET
(VPHASE) for overcurrent protection when it is turned on. If
VPHASE is lower than the user-programmable voltage VOCP,
the uP6101 asserts OCP and shuts down the converter.
The OCP level can be calculated according the on-
resistance of the lower MOSFET used.
IOCP
=
−
VOCP
RDS(ON)
(A)
uPI Semiconductor Corp., http://www.upi-semi.com
Rev. F01, File Name: uP6101-DS-F0101
5
Free Datasheet http://www.datasheet4u.net/
5 Page 
Load Transient Response
PHASE 10V/Div
COMP/EN 1V/Div
VOUT 200m/v/Div
IL 10A/Div
5us/Div
ILOAD 20A => 0A; 2.5A/us
UGATE Turn Off Waveforms
PHASE 1V/Div
UGATE – PHASE
1V/Div
LGATE 1V/Div
uP6101
Typical Operation Characteristics
UGATE Trun Off Waveforms
PHASE 2V/Div
UGATE – PHASE
2V/Div
LGATE 2V/Div
50ns/Div
ILOAD = 15A; VCC = VIN = 12V
UGATE Turn On Waveforms
PHASE 2V/Div
LGATE 2V/Div
UGATE – PHASE
2V/Div
50ns/Div
ILOAD = 15A; VCC = VIN = 5V
UGATE Turn On Waveforms
PHASE 1V/Div
LGATE 1V/Div
UGATE – PHASE
1V/Div
50ns/Div
ILOAD = 15A; VCC = VIN = 5V
uPI Semiconductor Corp., http://www.upi-semi.com
Rev. F01, File Name: uP6101-DS-F0101
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
4
50ns/Div
ILOAD = 15A; VCC = VIN = 12V
Line Regulation
6 8 10 12
Input voltage (V)
14
11
Free Datasheet http://www.datasheet4u.net/
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet UP6101.PDF ] | |
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