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CS5212GDR14 데이터시트 PDF




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부품번호 CS5212GDR14 기능
기능 Low Voltage Synchronous Buck Controller
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CS5212GDR14 데이터시트, 핀배열, 회로
CS5212
Low Voltage Synchronous
Buck Controller
The CS5212 is a low voltage synchronous buck controller. It
contains all required circuitry for a synchronous buck converter using
external N–Channel MOSFETs. High current internal gate drivers are
capable of driving high gate capacitance of low RDS(on) NFETs for
better efficiency. The V2control architecture is used to achieve
unmatched transient response, the best overall regulation and the
simplest loop compensation.
Additionally, the CS5212 provides overcurrent protection,
undervoltage lockout, soft start, built–in adaptive non–overlap, and an
adjustable fixed frequency range of 150 kHz to 750 kHz, which gives
the designer more flexibility to make efficiency and component size
trade offs. The CS5212 will also operate over a 3.1 V to 7.0 V range
using either single or dual input voltage.
Features
Switching Regulator Controller
N–Channel Synchronous Buck Design
V2 Control Topology
200 ns Transient Response
Programmable Fixed Frequency of 150 kHz–750 kHz
1.0 V 1.5% Internal Reference
Lossless Inductor Sensing Overcurrent Protection
Hiccup Mode Short Circuit Protection
Programmable Soft Start
40 ns GATE Rise and Fall Times (3.3 nF Load)
70 ns Adaptive FET Nonoverlap Time
Differential Remote Sense Capability
Available in Industrial and Commerical Temperature Grades
System Power Management
3.3 V Operation
Undervoltage Lockout
On/Off Control Through Use of the COMP Pin
http://onsemi.com
MARKING
DIAGRAM
14
SOIC–14
D SUFFIX
CASE 751A
CS5212x
AWLYWW
1
x
A
WL, L
YY, Y
WW, W
= E or G
= Assembly Location
= Wafer Lot
= Year
= Work Week
PIN CONNECTIONS
1
GATE(H)
BST
LGND
VFFB
VFB
COMP
SGND
PGND
GATE(L)
VC
IS+
IS–
VCC
ROSC
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 13 of this data sheet.
© Semiconductor Components Industries, LLC, 2002
May, 2002 – Rev. 2
1
Publication Order Number:
CS5212/D




CS5212GDR14 pdf, 반도체, 판매, 대치품
CS5212
ELECTRICAL CHARACTERISTICS (continued) (–40°C < TA < 85°C (CS5212E); 0°C < TA < 70°C (CS5212G); –40°C < TJ < 125°C;
3.1 V < VCC < 3.5 V; 3.1 V < VC < 7.0 V; 4.5 V < BST < 20 V; CGATE(H) = CGATE(L) = 3.3 nF; ROSC = 51 k; CCOMP = 0.1 µF, unless other-
wise specified.)
Characteristic
Test Conditions
Min Typ Max Unit
GATE(H) and GATE(L)
Rise Time
VC = BST = 7.0 V, Measure:
0.7 V < GATE(L) < 6.3 V,
0.7 V < GATE(H) < 6.3 V
– 40 80 ns
Fall Time
VC = BST = 7.0 V, Measure:
0.7 V < GATE(L) < 6.3 V,
0.7 V < GATE(H) < 6.3 V
– 40 80 ns
GATE(H) to GATE(L) Delay
GATE(H) < 2.0 V, GATE(L) > 2.0 V
40 70 110 ns
GATE(L) to GATE(H) Delay
GATE(L) < 2.0 V, GATE(H) > 2.0 V
40 70 110 ns
GATE(H)/(L) Pull–Down
Resistance to PGND
20 50 115 K
Overcurrent Protection
OVC Comparator Offset Voltage
IS+ Bias Current
IS– Bias Current
COMP Discharge Threshold
0 V < IS+ < VCC, 0 V < IS– < VCC
0 V < IS+ < VCC
0 V < IS– < VCC
54 60 66 mV
–1.0 0.1
1.0 µA
–1.0 0.1
1.0 µA
0.20 0.25 0.30
V
COMP Discharge Current in OVC
Fault Mode
COMP = 1.0 V
2.0 5.0 8.0 µA
PWM Comparator
Transient Response
PWM Comparator Offset
COMP = 0 – 1.5 V, VFFB, 20 mV overdrive
VFB = VFFB = 0 V; Increase COMP until
GATE(H) starts switching
– 100 200 ns
0.35 0.40 0.45
V
Artificial Ramp
Duty Cycle = 90%
40 70 100 mV
VFFB Bias Current
VFFB Input Range
Minimum Pulse Width
VFFB = 0 V
Note 3.
– 0.1 1.0 µA
– – 1.1 V
– – 200 ns
Oscillator
Switching Frequency
Switching Frequency
Switching Frequency
ROSC Voltage
General Electrical Specifications
ROSC = 18 k
ROSC = 51 k
ROSC = 115 k
600 750 900 kHz
240 300 360 kHz
120 150 180 kHz
1.21 1.25 1.29
V
VCC Supply Current
BST/VC Supply Current
Start Threshold
COMP = 0 V (no switching)
COMP = 0 V (no switching)
GATE(H) Switching, COMP Charging
– 5.0 8.0 mA
– 2.0 3.0 mA
2.7 2.8 2.9 V
Stop Threshold
GATE(H) Not Switching, COMP Not Charging
2.6
2.7
2.8
V
Hysteresis
Start–Stop
75 100 125 mV
Sense Ground Current
Note 4.
– 0.15 1.00 mA
3. GBD.
4. Recommended maximum operating voltage between the three grounds is 200 mV.
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CS5212GDR14 전자부품, 판매, 대치품
CS5212
beginning of the next oscillator cycle will set the latch so that
the main switch can be turned on and the regulator output
voltage ramps up. When the output voltage achieves a level
set by the COMP voltage, the main switch will be turned off.
The V2 control loop will adjust the main switch duty cycle
as required to ensure the regulator output voltage tracks the
COMP voltage. Since the COMP voltage increases
gradually, the soft start can be achieved. The start–up period
ends when the output voltage reaches the level set by the
external resistor divider.
Output Enable
Since there can be no switching until the COMP pin
exceeds the 0.5 V offset built into the PWM comparator, the
COMP pin can also be used for an enable function. Hold the
COMP pin below 0.4 V with an open collector circuit to
disable the output. When the COMP pin is released to enable
startup, the user must ensure there is no leakage current from
the enable circuit into COMP. During normal operation the
COMP output is driven with only 5.0 µA to 30 µA internally.
Hiccup Mode Overcurrent Protection
Under normal load conditions, the voltage across the IS+
and IS– pins is less than the 60 mV overcurrent threshold. If
the threshold is exceeded, the overcurrent fault latch is set,
the high side gate driver is forced low, and the COMP pin is
discharged with 5.0 µA. There is no switching until the
COMP voltage drops below a 0.25 V threshold. Then, the
fault latch is cleared and a soft start is initiated. The low
effective duty cycle during hiccup overcurrent greatly
reduces component stress for an extended fault.
Inductor Current Sensing
Besides using a current sense resistor to sense inductor
current, CS5212 provides the users with the possibility of
using loss–less inductor sensing technique. This sensing
technique utilizes the Equivalent Series Resistance (ESR) of
the inductor to sense the current. The output current is
sensed through an RC network in parallel with the inductor
as shown in Figure 4. The voltage across the small capacitor
is then fed to the OC comparator.
IS+ IS–
VIN R C
Q1
L RL
If the values of R and C are chosen such that:
L
RL
+
RC
Then the voltage across the capacitor C will be:
VC + RLIL
Therefore, if the time constant of the RC network is equal
to that of the inductor, the voltage across the capacitor is
proportional to the inductor current by a factor of the
inductor ESR. In practice, the user should ensure that under
all component tolerances, the RC time constant is larger than
the L/R time constant. This will keep the high frequency
gain for VC(s)/IL(s) less than the low frequency gain, and
avoid unnecessary OCP tripping during short duration
overcurrent situations.
Compared with conventional resistor sensing, the
inductor ESR current sensing technique is lossless, but is not
as accurate due to variation in the ESR from inductor to
inductor and over temperature. For typical inductor ESR, the
0.39%/°C positive temperature coefficient will reduce the
current limit at high temperature, and will help prevent
thermal runaway, but will force an increased design target at
room temperature. This technique can be more accurate than
using a PCB trace, since PCB copper thickness can vary
10–20%, compared to 1% variation in wire diameter
thickness typical of inductors.
Remote Voltage Sensing
The CS5212 has the capability to sense the voltage when
the load is located far away from the regulator. The SGND
pin is dedicated to the differential remote sensing. The
negative remote sense line is connected to SGND pin
directly, while the positive remote sense line is usually
connected to the top of the feedback voltage divider. To
prevent over–voltage condition caused by open remote
sense lines, the divider should also be locally connected to
the output of the regulator through a low value resistor. That
resistor is used to compensate for the voltage drop across the
output power cables.
Q2 CO
Figure 4. Inductor Current Sensing
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CS5212GDR14

Low Voltage Synchronous Buck Controller

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