FP5453RR-LF [FEELING]
Dual PWM Controller with Short Circuit Restart Function;
| 型号： | FP5453RR-LF |
| 厂家： | 
Feeling Technology |
| 描述： | Dual PWM Controller with Short Circuit Restart Function |
| 文件： | 总22页 (文件大小：609K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
FP5453
Dual PWM Controller with Short Circuit Restart Function
General Description
The FP5453 is a single chip composed of a 2.5V precision voltage reference regulator,
totem-pole output stages, two pulse width modulation control circuits each with one error amplifier and
duty comparator (DTC). Its built-in functions includes under-voltage lockout circuit (UVLO) and
programmable auto-restart timer for short circuit protection (SCSAR). With above features, it offers
space and low cost solutions in many applications such as the DC / DC converter.
FP5453, a high performance IC, is designed to complete a control circuit with few external
components. The circuit diagram of the typical application example is shown in below.
Features
Wide Operating Voltage Range: 3.6~25V
Feedback Reference Voltage: 2.5V
Oscillator Frequency: Max. 1.2MHz
Reference Voltage Precision: 2%
Low Quiescent Supply Current Under 4mA
Totem-pole Output Stage
Variable Duty Control (DTC)
Short Circuit Shutdown / Auto Re-start Function (SCSAR)
UVLO Protection Function
Package: SOP-16L / SOP-16L (EP) / SSOP-16L
Applications
HUB / Router
Set Top Box
HDD Server
CATV
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 1.0
1/22
FP5453
Function Block Diagram
VCC
RT
CT
DTC2
FB2
EA2+
OUT2
EA2-
Oscillator
PWM
COMP
1.2 V
Reference
Voltage
VREF
SCSAR
UVLO
SCSAR Protection Circuits
R
EA1+
EA1-
FB1
OUT1
PWM
COMP
DTC1
GND
Pin Descriptions
Name No. I / O
Description
Connect a Capacitor to This Pin to Adjust
Oscillator Frequency
Connect a Resistor to This Pin to Adjust
Oscillator Frequency
SOP-16L
CT
RT
1
2
I
I
EA1+
EA1-
FB1
3
4
I
I
Error Amplifier 1 Non-inverting Input
Error Amplifier 1 Inverting Input
Error Amplifier 1 Output
Output 1 Duty Comparator
Totem-pole Output 1
5
O
I
DTC1
OUT1
GND
VCC
6
7
O
P
P
O
I
8
IC Ground
9
IC Power Supply
OUT2
DTC2
FB2
10
11
12
13
14
15
16
Totem-pole Output 2
Output 2 Duty Comparator
Error Amplifier 2 Output
Error Amplifier 2 Inverting Input
Error Amplifier 2 Non-inverting Input
Short Circuit Protection Input
2.5V Reference Voltage Output
O
I
EA2-
EA2+
SCSAR
VREF
I
I
O
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 1.0
2/22
FP5453
SOP-16L (EP)
Name No. I / O
Description
Connect a Capacitor to This Pin to Adjust
Oscillator Frequency
Connect a Resistor to This Pin to Adjust
Oscillator Frequency
CT
RT
1
2
I
I
EA1+
EA1-
FB1
3
4
I
I
Error Amplifier 1 Non-inverting Input
Error Amplifier 1 Inverting Input
Error Amplifier 1 Output
5
O
I
DTC1
OUT1
GND
VCC
6
Output 1 Duty Comparator
Totem-pole Output 1
7
O
P
P
O
I
8
IC Ground
9
IC Power Supply
OUT2
DTC2
FB2
10
11
12
13
14
15
16
17
Totem-pole Output 2
Output 2 Duty Comparator
Error Amplifier 2 Output
O
I
EA2-
EA2+
SCSAR
VREF
Error Amplifier 2 Inverting Input
Error Amplifier 2 Non-inverting Input
Short Circuit Protection Input
2.5V Reference Voltage Output
Exposed PAD. Must be connected to GND
I
I
O
P
EP
Name No. I / O
Description
Connect a Capacitor to This Pin to Adjust
Oscillator Frequency
Connect a Resistor to This Pin to Adjust
Oscillator Frequency
CT
RT
1
2
I
I
SSOP-16L
EA1+
EA1-
FB1
3
4
I
I
Error Amplifier 1 Non-inverting Input
Error Amplifier 1 Inverting Input
Error Amplifier 1 Output
Output 1 Duty Comparator
Totem-pole Output 1
Top View
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CT
RT
EA1+
EA1-
FB1
DTC1
OUT1
GND
VREF
SCSAR
EA2+
EA2-
FB2
DTC2
OUT2
VCC
5
O
I
DTC1
OUT1
GND
VCC
6
7
O
P
P
O
I
8
IC Ground
9
IC Power Supply
OUT2
DTC2
FB2
10
11
12
13
14
15
16
Totem-pole Output 2
Output 2 Duty Comparator
Error Amplifier 2 Output
Error Amplifier 2 Inverting Input
Error Amplifier 2 Non-inverting Input
Short Circuit Protection Input
2.5V Reference Voltage Output
O
I
EA2-
EA2+
SCSAR
VREF
I
I
O
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 1.0
3/22
FP5453
Marking Information
SOP-16L & SOP-16L (EP)
SSOP-16L
FP5453
-
Halogen Free
Lot Number
Internal ID
Per-Half Month
Year
Halogen Free: Halogen free product indicator
Lot Number: Wafer lot number’s last two digits
For Example: 132386TB 86
Internal ID: Internal Identification Code
Per-Half Month: Production period indicated in half month time unit
For Example: January → A(Front Half Month), B (Last Half Month)
February → C(Front Half Month), D(Last Half Month)
Year: Production year’s last digit
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 1.0
4/22
FP5453
Ordering Information
Part Number
Operating Temperature
Package
SOP-16L
MOQ
Description
Tape & Reel
Tape & Reel
Tape & Reel
FP5453DR-LF
2500EA
2500EA
2500EA
-20°C ~ +85°C
-20°C ~ +85°C
-20°C ~ +85°C
FP5453XR-LF
FP5453RR-LF
SOP-16L (EP)
SSOP-16L
Absolute Maximum Ratings
Parameter
Power Supply Voltage
Differential Input Voltage
Output Current
Symbol Conditions
Min.
Typ.
Max.
Unit
V
VCC
Vid
Io
3.6
26
3
V
150
+150
+90
+50
+110
+45
+7
mA
Maximum Junction Temperature
TJ
°C
SOP-16L
°C / W
°C / W
°C / W
°C / W
°C / W
°C / W
mW
Thermal Resistance Junction to
Ambient
θJA
θJC
PD
SOP-16L (EP)
SSOP-16L
SOP-16L
Thermal Resistance Junction to
Case
SOP-16L (EP)
SSOP-16L
+55
830
1.4
SOP-16L , TA=25℃
SOP-16L (EP)
Maximum Power Dissipation
Storage Temperature Range
W
570
+150
mW
SSOP-16L, TA=25℃
-65
℃
℃
Lead Temperature (soldering, 10
sec)
+260
Suggested IR Re-flow Soldering Curve
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 1.0
5/22
FP5453
Recommended Operating Conditions
Parameter
Symbol
Conditions
Min.
3.6
Typ.
Max.
Unit
V
Supply Voltage
Operating Temperature
25
-20
+85
℃
DC Electrical Characteristics (VCC= 6V, f=200kHz, unless otherwise noted)
Parameter
Reference section
Output Voltage (pin 16)
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
VREF IO=1mA
2.45
2.5
-0.1
-0.2
2.55
±1
V
%
%
TA=-20℃ to +25℃
TA=+25℃ to +85℃
Output Voltage Change with
Temperature
±1
△VREF
VREF
△VREF
VREF
/
/
V
CC=3.6V～25V
Input Voltage Regulation
Output Voltage Regulation
2
12.5
mV
Io = 0.1mA to 1 mA
3
8
mV
mA
Short-circuit Output Current
ISHORT VO=0
3
10
30
Under Voltage Lockout Section
Upper threshold voltage(VCC
)
)
VUPPER
3.2
3.0
200
V
V
Lower threshold voltage(VCC
VLOW
VHYS
IO (REF) = 0.1 mA, TA=25℃
Hysteresis (VCC
)
100
mV
Short-circuit Protection Control Section
SCP re-Start Voltage
VRS
VTH
IRSC
VFB1 or VFB2 <1.5V
VFB1 or VFB2 <1.5V
VFB1 or VFB2 <1.5V
VFB1 or VFB2 <1.5V
0.5
1.0
V
V
SCP Threshold Voltage
SCP Re-start Charge Current
SCP Re-start / Hold Time ratio
20
μA
-
TRS
/
1 / 50
THOLD
SCP Comparator 1 Threshold
Voltage
VCOMP (TH)
1.2
V
Oscillator Section
Frequency
f
CT=330pF, RT=10K
200
0.2
KHZ
%
Frequency Change with Voltage
△f / △V VCC=3.6V to 25V
-0.4
-0.2
±2
±2
%
TA=-20℃ to 25℃
△f / △T
Frequency Change with
Temperature
%
TA=25℃ to 85℃
Duty Control Section
Input Bias Current (DTC)
IBIAS
1
μA
V
Zero Duty Cycle
VTH
2.0
1.4
2.20
Input Threshold Voltage
Maximum Duty Cycle
1.2
V
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 1.0
6/22
FP5453
Parameter
Error Amplifier Section
Input Offset Voltage
Input Offset Current
Input Bias Current
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
VIO
IIO
VFB=1.25V
±6
mV
nA
nA
VFB=1.25V
VFB=1.25V
±100
500
IBIAS
160
Common-mode input voltage
range
VICM
VCC=3.6V to 25 V
1.0
70
1.5
Open-loop Voltage Amplification
Unity-Gain Bandwidth
AVO
BW
80
dB
MHZ
V
1.5
Positive Output Voltage Swing
Negative Output Voltage Swing
VPOS
VNEG
VREF-0.3
1
V
Output (Sink) Current (Feedback
Pin)
ISINK
VID= -0.1V, VO=1.25V
2
3
mA
Output (Source) Current
(Feedback Pin)
ISOURCE VID=0.1V, VO=1.25V
-100
-140
μA
Output Section
ISINK=20mA
VOL
0.18
1.7
4.5
13.4
50
0.2
2.0
V
V
VOUT Low Voltage
I
SINK =130mA, VCC=15V
ISOURCE =20mA
SOURCE =130mA, VCC=15V
4.0
V
VOUT High Voltage
VOH
I
12.8
V
Rise Time
tR
tF
100
100
nS
nS
TJ=25℃, CL=1nF
TJ=25℃, CL=1nF
Fall Time
50
PWM Comparator Section
Zero Duty Cycle
2.0
1.4
2.20
V
Input Threshold Voltage at
f=10kHz (Feedback)
VTH
Maximum Duty Cycle
1.2
V
Total Device
Standby Supply Current
Average Supply Current
ISTANDBY Off-state
IAVE RT=10K
4.0
4.5
5.5
6.0
mA
mA
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 1.0
7/22
FP5453
Typical Operating Characteristics
TRIANGLE OSCILLATOR FREQUENCY
OSCILLATOR FREQUENCY VARIATION
VS
TIMING RESISTANCE
1 M
VS
FREE-AIR TEMPERATURE
3
2
Vcc = 5 V
T
A
= 330pF
= 25o
C
C
T
R
= 10 KΩ
T
C
C
fosc = 200kHz
= 100 pF
T
T
100 K
10 K
1 K
1
0
= 1000 pF
-1
-2
-3
C
= 10000 pF
T
1 K
4 K 10 K
40 K 100 K
400 K
1 M
-25
0
25
50
75
100
RT - Timing Resistance -
Figure 1
TA - Free-Air Temperature - o
C
Figure 2
TRIANGLE WAVEFORM SWING VOLTAGE
TRIANGLE WAVEFORM PERIOD
VS
VS
TIMING CAPACITANCE
TIMING CAPACITANCE
102
101
100
10-1
2.6
2.4
2.2
2
Vcc = 5 V
= 25o
Vcc = 5 V
= 25o
C
= 5.1 KΩ
T
C
A
T
A
R
= 5.1KΩ
T
R
T
1.8
1.6
1.4
1.2
1
0.8
101
102
103
104
105
101
102
103
104
105
CT - Timing Capacitance - pF
Figure 3
CT - Timing Capacitance - pF
Figure 4
REFERENCE OUTPUT VOLTAGE VARIATION
REFERENCE OUTPUT VOLTAGE VARIATION
VS
VS
FREE-AIR TEMPERATURE
FREE-AIR TEMPERATURE
30
30
Vcc = 3.6 V
= 1mA
Vcc = 40 V
= 1mA
I
I
(ref)
(ref)
20
10
0
20
10
0
-10
-20
-30
-10
-20
-30
-25
0
25
50
75
100
-25
0
25
50
75
100
TA - Free-Air Temperature -o
TA - Free-Air Temperature -o
C
C
Figure 5
Figure 6
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 1.0
8/22
FP5453
UNDERVOLTAGE LOCKOUT
HYSTERESIS CHARACTERISTICS
REFERENCE OUTPUT VOLTAGE
VS
6
5
4
3
2
1
0
SUPPLY VOLTAGE
T
A
= 25 o
C
3
2.5
2
T
= 85o
C
T
A
= -20o
C
A
T
A
= 25oC
1.5
1
0.5
0
0
1
2
3
4
5
5
10
15
20
25
30
0
Vcc - Supply Voltage - V
Vcc - Supply Voltage - V
Figure 8
Figure 7
ERROR AMP MAXIMUM
OUTPUT VOLTAGE SWING
OUTPUT TRANSISTOR ON DUTY CYCLE
VS
VS
DEAD - TIME INPUT VOLTAGE
FREQUENCY
0
2.5
Vcc = 3.6 V
10
2.25
2
C
= 330pF
= 10 K
T
T
Vcc = 5 V
= 25oC
R
20
30
T
A
1.75
1.5
1.25
1
40
50
60
70
0.75
0.5
0.25
80
90
100
0
0.5
1
1.5
2
2.5
3
3.5
4
1K
10K
100K
1M
10M
Dead - Time Input Voltage - V
f - Frequescy - Hz
Figure 9
Figure 10
STANDBY CURRENT
VS
STANDBY CURRENT
VS
FREE - AIR TEMPERATURE
SUPPLY VOLTAGE
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
T
A
= 25oC
5.5
Standby Current
Vcc=30V,No Load
5.0
4.5
4.0
Standby Current
3.5
3.0
Vcc=3.6V,No Load
Standby Current
Vcc=6.0V,No Load
2.5
2.0
0
-25
0
25
50
75
100
0
TA - Free-Air Temperature -oC
0
5
10
15
20
25
30
Vcc - Supply Voltage - V
Figure 12
Figure 11
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 1.0
9/22
FP5453
Timing Waveform
OSC
1.5 V
FB
PWM
COMPARATOR
TOTEM-POLE
OUTPUT
VCC
3.6 V
VTH
Charge
Current
SCSAR
Hold-stage
Standby stage
Re-start
stage
Figure 13. FP5453 Timing Diagram
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 1.0
10/22
FP5453
Function Description
Voltage Reference
FP5453 includes an internal 2.5V reference regulator to provide its internal circuits’ voltage bias.
It also can be used with external resistive divider which connecting to the IC error amplifier inverting
input to provide output feedback reference (see Fig 14).
Figure 14 Reference and Error Amplifiers with Resistive Dividers
The error amplifier inverting input (EA1- or EA2-) reference voltage equations are shown as
followings:
R2
VEA1 VREF(2.5V)
R1 R2
R4
VEA2 VREF(2.5V)
R3 R4
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 1.0
11/22
FP5453
Error Amplifier
The error amplifiers of FP5453 compare the feedback voltage from the resistive dividers of
DC-DC converter's output with the reference bias (see Fig 15) and generate the error signals for the
PWM comparators.
Figure 15 Error Amplifier with Feedback / Compensation Circuits
The Buck converter output voltage:
R5
R6
R2
VOUT 1
2.5V
R1 R2
Error Amplifier Gain:
1 sR7C1
sRi(C1 C2)(1 sR7C2)
Av 1
, Ri=R1//R2
Error Amplifier Zero and Pole Frequency:
1
1
FZ
Fp
,
2R7C1
2R7C2
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 1.0
12/22
FP5453
Oscillator / PWM Comparator
The oscillator frequency can be adjusted from 20KHz to 1.2MHz by the capacitor (CT) and
resistor (RT) which are connected to pin 1 and pin 2 of FP5453 respectively. A sawtooth waveform
would compare with output signal of the error amplifier and duty control voltage. Figure 16 shows the
relationship of oscillator, error amplifier and PWM comparator. Figure 17 shows the FP5453 pin
waveforms.
Figure 16 Oscillator / PWM Comparator with Frequency RC Circuits
Figure 17 FP5453 Timing Waveforms
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 1.0
13/22
FP5453
The relationship of oscillator waveform and duty voltage is shown below (see Fig 18):
Pin1 Voltage
DTC (zero)
T
DTC (max.)
Time
Figure 18. Oscillator Frequency with DTC Voltage
The oscillator frequency can be calculated by:
VT
Vzero Vmax.
f
2 CT RT
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 1.0
14/22
FP5453
Duty Control / Soft-Start
The duty control (DTC) is a function for the PWM duty cycle limitation. If the DTC voltage is lower
than DTC maximum voltage (1.35V typically), the PWM duty cycle can be as large as 100% cycle. If
the DTC voltage is higher than DTC zero voltage (2.0V typically), the PWM duty cycle will always be
turned-off (zero duty).
The system of DC-DC converter can use DTC function with an external RC for Power-On
soft-start (see Fig 19).
16
VREF
C3
IC
R9
DTC FP5453
1
6
VR
R8
VR
VREF
2.0
V
Zero Duty Cycle
1.35
V
Max Duty Cycle
t
T=Soft-Start Time
Figure 19 DTC Soft-start RC Circuit and Waveform
The soft-start time equation:
R9R8
R9 R8
t 5(
) C3
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 1.0
15/22
FP5453
Short-circuit Shutdown and Auto Re-start Protection (SCSAR)
FP5453 includes short-circuit shutdown and auto re-start protection function (see Figure 20),
which turns the Power MOS off to prevent damage when the converter output is over loading or short
circuit.
2.5 V
SCP
COMP3
Icharge
2
Icharge
Idischarge
1.5V
S
Q3
Q
R
Cscp
SCSAR
5
SCP
COMP2
To Output
Drive Logic
From Error
Amp
SCP
Q1
COMP1
V
1.0V/0.5V
To DTC
PWM
Low High
1.5V
Comparator
Q2
Figure 20. SCSAR Protection Circuit
In normal condition, error amplifier output voltage is higher than 1.5V, SCP comparator 1 output
keeps a high state and Q1 is turn-on, so that CSCP cannot be charged. When short circuit condition
occurs, the error amplifier output would be pulled to lower than 1.50V, SCP comparator 1 output then
changes to low state and CSCP is charged by ICHARGE current. The SCP function of FP5453 is no longer
triggered if short circuit condition is removed before SCP comparator 2 outputs high.
When CSCP is charged to 1.0V threshold voltage, SCP comparator 2 output changes to high state
and Q2 is turned on to keep Q1 off in latch mode. Meanwhile, the source current of CSCP would change
to half of original current for the first shutdown phase, FP5453 output is turn-off and DTC pin is pulled
to low.
As the CSCP is charged continuous, its potential will finally to reach higher 1.5V and even higher.
At this time, SCP comparator 3 would output high then make the S-R Latch output turns on Q3 to
discharge CSCP and change SCP comparator 2's threshold from 1.0V to 0.5V. The CSCP is discharged
continuously to 0.5V then SCP comparator 2 output low to release the S-R latch. Output of FP5453 is
active and DTC pin is working in soft-start state or limitation of duty cycle.
CSCP discharging from 1.5V to 0.5V is the second shutdown phase which finishes SCP; and
FP5453 would be released from shutdown state and re-start the normal operation. Figure 21 explains
relationship about SCSAR pin and the other pins of FP5453.
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 1.0
16/22
FP5453
Short Circuit
Occured
SCP Comparator 1 Threshold Voltage
FB
1.5V
1.5V
1.0V
VTH2
VTH1
I TH3
I TH1
VCSCP
I TH2
VTH3
0.5V
OUT
DTC
VCC
3.6V
PHASE2
NORMAL OPERATION
SHUTDOWN
PHASE1
RE-START
Figure 21. Shutdown and Re-start waveform
The equations are shown below for shutdown and re-start time calculation:
AUTO RE-START time equation:
VTH1 CSCP
tRESTART
ITH1
SHUTDOWN time equation:
VTH2 VTH1
CSCP
VTH2 VTH3 CSCP
tSHUTDOWN tPHASE1 tPHASE2
ITH2
ITH3
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 1.0
17/22
FP5453
Output Transistors
The output of the FP5453 is a totem-pole transistor pair which supplies source and sink current
capacity for driving the external MOSFET directly. A basic drive method is shown as figure 22.
When PWM operation frequency is different, both of the required MOSFET ON and OFF time are
different too.
ISOURCE
C
OSC
1
PWM
COMP
EA
R
ISINK
DTC
UVLO
FP5453
Figure 22. FP5453 MOSFET Output Driving Cricuit
Note:
It is very important to choose a suitable MOSFET for high frequency operation. The larger
capacitor between gate and source of MOSFET makes more switching loss under the same supply
voltage and driving current.
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 1.0
18/22
FP5453
Application Information
Vin +12V
IC1
C1 330pF
R2 30k
CT
REF
C2 0.33uF
R1
30k
RT
SCP
2IN+
2IN-
2FB
R3 10k
1IN+
1IN-
1FB
C3
100uF
C17
220uF
C4 270pF
C5 270pF
R8 33k
Q2
AP9435
L2 22uH
R7
Vout2 +5V
1DTC 2DTC
1OUT 2OUT
R6
30k
33k
C6 2200pF
C7 3300pF
R11
30K
R10
2K
R12
0
GND
VCC
D2
SCD34
FP5453
C9
C19
NA
C10
470uF
R13 0.1uF
10k
R14
30k
C11 R15
30k
C12
0.022uF
R16
30k
0.022uF
R19
47k
R20
47k
C13
220uF
Q1
AP9435
L1 22uH
Vout1 +3.3V
R24
16.5k
R23
2k
R26
0
D1
SCD34
C15
R27 0.1uF
C14
NA
C16
470uF
10k
Figure 23. 2-Channel DC-DC Converter Circuit
Note:
1. The IN1- and IN2- is 1.25V a half of VREF voltage because R1=R6 and R2=R16.
2. The R14-R19-C11 and R15-R20-C12 are a DTC circuits for buck regulators power-on.
3. The R11-R13 and R24-R27 are the buck regulator output voltage feedback resistances.
4. The R7-C4-C6 is the compensation circuit for error amplifier 1 of FP5453.
5. The R8-C5-C7 is the compensation circuit for error amplifier 2 of FP5453.
6. The R3-C1 is an external RC circuit for FP5453 internal oscillator.
7. The C2 is FP5453 short circuit protection delay time capacitor.
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 1.0
19/22
FP5453
Package Outline
SOP-16L
UNIT: mm
Symbols
Min. (mm)
1.346
0.101
1.244
9.804
3.810
5.791
0.406
0°
Max. (mm)
1.752
0.254
1.651
10.007
3.987
6.197
1.270
8°
A
A1
A2
D
E
H
L
θ°
Note:
1. Package dimensions are in compliance with JEDEC outline: MS-012 AC.
2. Dimension “D” does not include molding flash, protrusions or gate burrs.
3. Dimension “E” does not include inter-lead flash or protrusions.
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 1.0
20/22
FP5453
SOP-16L (EP)
UNIT: mm
Symbols
Min. (mm)
1.346
0.101
1.244
9.804
3.810
5.791
0.406
0°
Max. (mm)
1.752
0.254
1.651
10.007
3.987
6.197
1.270
8°
A
A1
A2
D
E
H
L
θ°
Exposed PAD Dimensions:
Symbols
Min. (mm)
Max. (mm)
E1
D1
2.184 REF
4.114 REF
Note:
1. Dimension ”D” does not include molding flash, protrusions or gate burrs.
2. Dimension “E” does not include inter-lead flash or protrusions.
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 1.0
21/22
FP5453
SSOP-16L (EP)
UNIT: mm
Max. (mm)
Symbols
Min. (mm)
1.346
A
A1
A2
b
1.752
0.254
1.498
0.304
0.279
0.254
0.228
5.003
3.987
6.197
1.270
0.101
0.203
0.203
0.177
0.177
4.800
3.810
5.791
0.406
b1
c
c1
D
E1
E
L
e
0.635 BASIC
θ°
0°
8°
Note:
1. Package dimensions are in compliance with JEDEC outline: MO-137 AB.
2. Dimension “D” does not include molding flash, protrusions or gate burrs.
3. Dimension “E” does not include inter-lead flash or protrusions
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 1.0
22/22
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