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PDF FP5451B Data sheet ( Hoja de datos )
| Número de pieza | FP5451B | |
| Descripción | DUAL CHANNEL PWM CONTROL IC | |
| Fabricantes | Feeling Technology | |
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Technology
FP5451B
DUAL CHANNEL PWM CONTROL IC
WITH SCP/DTC FUNCTION
GENERAL DESCRIPTION
The FP5451B, a 1-chip composed of dual open collector transistor pulse-width-modulation
control circuits with two error amplifiers and dead-time comparators (DTC), the FP5451B
contains a 2.5V precision voltage reference regulator, under-voltage lockout circuit (UVLO),
short circuit protection circuit (SCP), applied to offer space and low cost in many applications
such as the DC/DC converter and backlight inverter.
Using few external components, FP5451B, a high performance integrated IC, is designed for
a control circuit. The circuit diagram of the typical application example is as below.
FEATURES
Fixed Reference Voltage: 2.5V
Reference Voltage Precision: 1%
Output sink current up to 100mA
Low quiescent supply current
Wide operating voltage range: 4~40V
Variable dead-time control (DTC)
UVLO protection function
SCP protection function (Typ. 1.3V)
Oscillator Frequency: Max. 800KHz
Package: SOP16 / PDIP16 / SSOP16
SOP16
PDIP 16
TYPICAL APPLICATION
Dual Output Switch Regulator
Backlight Inverter
LCD Monitor
SSOP 16
Rev0.3 SEP. 12, 2005
P1/FP5451B
1 page  
Technology
FP5451B
DC ELECTRICAL CHARACTERISTICS
Electrical characteristics over recommended operating free-air temperature range, VCC=6V,
f=200kHz (unless otherwise noted)
Reference section
PARAMETER
Output voltage (pin 16)
Output voltage change with
Temperature
Input voltage regulation
Output voltage regulation
Short-circuit output current
SYMBOL TEST CONDITIONS
VREF
IO=1mA
TA=-20 to 25
TA=25 to 85
VREF /VREF Vcc=3.6V 40V
VREF /VREF Io = 0.1mA to 1 mA
ISHORT VO=0
MIN
2.45
3
TYP
2.5
-0.1%
-0.2%
2
1
10
MAX
2.55
±1%
±1%
12.5
7.5
30
UNIT
V
mV
mV
mA
Undervoltage lockout section
PARAMETER
Upper threshold voltage(Vcc)
Lower threshold voltage(Vcc)
Hysteresis (Vcc)
Reset threshold voltage(Vcc)
SYMBOL
VUPPER
VLOW
VHYS
VRESET
TEST CONDITIONS
IO(REF) = 0.1 mA,
TA=25
MIN TYP MAX UNIT
2.72 V
2.6 V
80 120
mV
1.5 1.9
V
Short-circuit protection control section
PARAMETER
Input threshold voltage (SCP)
Standby voltage (SCP)
Latched input voltage (SCP)
Input (source) current
Comparator threshold voltage
(FEEDBACK)
SYMBOL
VTH
VSTANDBY
VLATCH
ISOURCE
TEST CONDITIONS
TA= 25
No pull-up
No pull-up
VI=0.7V, TA=25
VCOMP(TH)
MIN TYP MAX UNIT
1.2 1.3 1.5
V
220 265 300 mV
220 280 mV
-1.5 -2.0 -2.5
A
1.2 V
Oscillator section
PARAMETER
Frequency
Standard deviation of
frequency
Frequency change with voltage
Frequency change with
Temperature
SYMBOL
f
f
f/ V
f/ T
TEST CONDITIONS
CT=220pF,RT=10K
CT=220pF,RT=10K
VCC=3.6V to 40V
TA=-20 to 25
TA=25 to 85
MIN TYP MAX UNIT
400 KHZ
10%
1%
-0.4%
-0.2%
±2%
±2%
Dead-time control section
PARAMETER
Input bias current (DTC)
Latch mode (source) current(DTC)
Latched input voltage (DTC)
Input threshold voltage at
f=10kHZ(DTC)
SYMBOL
IBIAS
ISOURCE
VLATCH
VTH
TEST CONDITIONS
TA=25
IO=40 A
Zero duty cycle
Maximum duty cycle
MIN
-80
2.3
1.85
1.4
TYP
-200
MAX
1
1.95
1.5
UNIT
A
A
V
V
Rev0.3 SEP. 12, 2005
P5/FP5451B
5 Page 
Technology
TIMING WAVEFORM
FP5451B
Oscillator Triangle Waveform
Error Amplifier Output
Dead-Time Input Voltage
Short-Circuit Protection
Comparator Input Voltage
PWM Comparator Output Voltage
Output Transistor Collector
Waveform
Protection Enable
Terminal Waveform
Short-Circuit Protection
Comparator Output
Power Supply Voltage
2.8 V TYP
Protection Enable Time, tpe = (0.46 * 10E6 * Cpe) in
seconds
FP5451B Timing Diagram
2.0 V
1.6 V
1.4 V
1.25 V
H
L
Dead Time 100%
H
L
1.4 V
0V
tpe
H
L
3.6 V
0V
Rev0.3 SEP. 12, 2005
P11/FP5451B
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet FP5451B.PDF ] | |
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