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D1067 데이터시트 PDF




DMS에서 제조한 전자 부품 D1067은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 D1067 기능
기능 monolithic step-down switch mode converter
제조업체 DMS
로고 DMS 로고


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D1067 데이터시트, 핀배열, 회로
D1067
DESCRIPTION
The DMS1067 is a monolithic step-down switch
mode converter with a built in internal power
MOSFET. It achieves 2A continuous output cur-
rent over a wide input supply range with excel-
lent load and line regulation.
The DMS1067 requires a minimum number of
readily available standard external components.
Current mode operation provides fast transient
response and eases loop stabilization.
Fault condition protection includes cycle-by-
cycle current limiting and thermal shutdown. In
shutdown mode the regulator draws 25µA of
supply current.
FEATURES
2A Output Current
0.22Internal Power MOSFET Switch
Stable with Low ESR Output Ceramic Ca-
pacitors
Up to 95% Efficiency
25µA Shutdown Mode
Fixed 420KHz Frequency
Thermal Shutdown
Cycle-by-Cycle Over Current Protection
Wide 4.75 to 25V Operating Input Range
Output Adjustable from 1.22V to 21V
Programmable Under Voltage Lockout
APPLICATIONS
Distributed Power Systems
Battery Chargers
Pre-Regulator for Linear Regulators
PC Monitors
4.75 to 25
DMS1067
PACKAGE REFERENCE
Part number
DMS1067S
DMS1067P
Package
SOIC8
PDIP8
Temperature
–40°C to +125°C
–40°C to +125°C
REV:A2FYJ 2011-01-01
1
DMS Microelectronic Limited




D1067 pdf, 반도체, 판매, 대치품
TM
D1067
OPERATION
The DMS1067 is a current-mode step-down
switch-mode regulator. It regulates input voltages
from 4.75V to 25V down to an output voltage as
low as 1.222V and is able to supply up to 2A of
load current. The DMS1067 uses current-mode
control to regulate the output voltage. The output
voltage is measured at FB through a resistive
voltage divider and amplified through the internal
error amplifier. The output current of the trans-
conductance error amplifier is presented at
COMP where a network compensates the regu-
lation control system. The voltage at COMP is
compared to the switch current measured inter-
nally to control the output voltage.
The converter uses an internal N-Channel
MOSFET switch to step down the input voltage
to the regulated output voltage. Since the
MOSFET requires a gate voltage greater than
the input voltage, a boost capacitor connected
between SW and BS drives the gate. The ca-
pacitor is internally charged while the switch is
off. An internal 10 switch from SW to GND is
used to ensure that SW is pulled to GND when
the switch is off to fully charge the BS capacitor.
42-450KHz
Figure 1 – Functional Block Diagram
REV:A2FYJ 2011-01-01
4
DMS Microelectronic Limited

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D1067 전자부품, 판매, 대치품
TM
D1067
Choosing the Compensation Components
The values of the compensation components
given in Table 4 yield a stable control loop for the
output voltage and capacitor given.
Table 4—Compensation Values for Typical
Output Voltage/Capacitor Combinations
VoU
C2
R1 C3 C6
2.5V 22uF Ceramic 7.5k2.2nF None
3.3V 22uF Ceramic 10k2nF None
5V 22uF Ceramic 15k1.2nF None
12V 22uF Ceramic 33k1nF None
2.5V 560uF/6.3V 200k1nF 100pF
(30mESR)
3.3V 560uF/6.3V 200k1nF 82pF
(30mESR)
5V 470uF/10V 250k1nF 56pF
(30mESR)
12V 220uF/25V 250k1nF 27pF
(30mESR)
To optimize the compensation components for
conditions not listed in Table 4, use the following
procedure:
Choose the compensation resistor to set the de-
sired crossover frequency. Determine the value
by the following equation:
Putting in the know constants and setting the
crossover frequency to the desired 40KHz:
Choose the compensation capacitor to set the
zero below 1/4 of the crossover frequency.
Determine the value by the following equation:
Determine if the second compensation capacitor,
C6, is required. It is required if the ESR zero of
the output capacitor occurs at less than four
times the crossover frequency.
or
If this is the case, add the second compensation
capacitor. Determine the value by the equation:
,
REV:A2FYJ 2011-01-01
7
Where RESR(MAX) is the maximum equivalent series
resistance of the output capacitor.
For Example:
VQUT = 3.3V
C2 = 22uFCeramic(ESR = 10m)
R3(1.37 x 108 )x (22 x 10-6 )x 3.3 = 9.9k
Use the nearest standard value of 10k
C3>(0.22x(22x10-6)x3.3/(10x103)=1.6nF
Use a standard value of 2nF.
2π x C2 x RESR x fC =0.014
wich is less than 1, therefore no second compen-
sation capacitor is required.
Table 5 – Recommended Components for Stan-
dard Output Voltage
VOUT
R1 L1 Minimum
1.22V 0 6.8uH
1.5V
2.32 k
6.8uH
1.8V
4.75 k
10uH
2.5V
10.5 k
10uH
3.3V
16.9 k
15uH
5.0V
30.9 k
22uH
Negative Output Voltage
The DMS1067 can be configured as a buck-boost
regulator to supply negative output voltage.
Because the GND pin of the IC is now connected
to negative output voltage, the maximum allow-
able input voltage is the IC input voltage rating
(25V) minus the negative output voltage value. A
typical application circuit is shown in Figure 3.
External Bootstrap Diode
It is recommended that an external bootstrap di-
ode be added when the system has a 5V fixed
input or the power supply generates a 5V output.
This helps improve the efficiency of the regulator.
The bootstrap diode can be a low cost one such
as IN4148 or BAT54.
This diode is also recommended for high
duty cycle operation
(when (VOUT/ VIN) >65%)
and high output voltage
(VOUT>12V) applications
DMS1067
DMS Microelectronic Limited

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