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PDF CM0765R Data sheet ( Hoja de datos )

Número de pieza CM0765R
Descripción FSCM0765R
Fabricantes Fairchild Semiconductor 
Logotipo Fairchild Semiconductor Logotipo



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www.fairchildsemi.com
FSCM0765R
Green Mode Fairchild Power Switch (FPSTM)
Features
• Internal Avalanche Rugged Sense FET
• Low startup current (max 40uA)
• Low power consumption under 1 W at 240VAC & 0.4W
load
• Precise Fixed Operating Frequency (66kHz)
• Frequency Modulation for low EMI
• Pulse by Pulse Current Limiting (Adjustable)
• Over Voltage Protection (OVP)
• Over Load Protection (OLP)
• Thermal Shutdown Function (TSD)
• Auto-Restart Mode
• Under Voltage Lock Out (UVLO) with hysteresis
• Built-in Soft Start (15ms)
Application
• SMPS for VCR, SVR, STB, DVD & DVCD
• Adaptor
• SMPS for LCD Monitor
Description
The FSCM0765R is an integrated Pulse Width Modulator
(PWM) and Sense FET specifically designed for high
performance offline Switch Mode Power Supplies (SMPS)
with minimal external components. This device is an
integrated high voltage power switching regulator which
combine an avalanche rugged Sense FET with a current
mode PWM control block. The PWM controller includes
integrated fixed frequency oscillator, under voltage lockout,
leading edge blanking (LEB), optimized gate driver, internal
soft start, temperature compensated precise current sources
for a loop compensation and self protection circuitry.
Compared with discrete MOSFET and PWM controller
solution, it can reduce total cost, component count, size and
weight simultaneously increasing efficiency, productivity, and
system reliability. This device is a basic platform well suited
for cost effective designs of flyback converters.
Table 1. Maximum Output Power
OUTPUT POWER TABLE
PRODUCT
230VAC ±15%(3)
Adapt- Open
er(1) Frame(2)
85-265VAC
Adapt- Open
er(1) Frame(2)
FSCM0565RD 50W
65W
40W
50W
FSCM0765RD 65W
70W
50W
60W
FSCM0565RC 70W
85W
60W
70W
FSCM0765RC 85W
95W
70W
85W
Notes:
1. Typical continuous power in a non-ventilated enclosed
adapter measured at 50°C ambient.
2. Maximum practical continuous power in an open frame
design at 50°C ambient.
3. 230 VAC or 100/115 VAC with doubler.
Typical Circuit
AC
IN Drain
PWM
Ilimit
Vfb Vcc GND
DC
OUT
Figure 1. Typical Flyback Application
©2004 Fairchild Semiconductor Corporation
Rev.1.0.0
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CM0765R pdf
Electrical Characteristics
(Ta = 25°C unless otherwise specified)
Parameter
Sense FET SECTION
Drain source breakdown voltage
Zero gate voltage drain current
Static drain source on resistance
Output capacitance
Turn on delay time
Rise time
Turn off delay time
Fall time
CONTROL SECTION
Initial frequency
Modulated frequency range
Frequency modulation cycle
Voltage stability
Temperature stability
Maximum duty cycle
Minimum duty cycle
Start threshold voltage
Stop threshold voltage
Feedback source current
Soft-start time
Leading Edge Blanking time
BURST MODE SECTION
Burst Mode Voltages
FSCM0765R
Symbol
Condition
Min. Typ. Max. Unit
BVDSS
IDSS
RDS(ON)
VGS = 0V, ID = 250µA
VDS = Max, Rating
VGS = 0V
VGS = 10V, ID = 2.3A
650 -
-V
- - 500 µA
- 1.4 1.6
COSS
VGS = 0V, VDS = 25V,
f = 1MHz
- 100 - pF
TD(ON) VDD= 325V, ID= 5A
- 25 -
(MOSFET switching
TR time is essentially
- 60
TD(OFF)
independent of
operating temperature)
-
115
-
-
ns
TF - 65 -
FOSC
Fmod
Tmod
FSTABLE
FOSC
DMAX
DMIN
VSTART
VSTOP
IFB
TSS
TLEB
VCC=14V, VFB=4V
-
-
10VVCC17V
25°CTa+85°C
-
-
VFB=GND
VFB=GND
VFB=GND
-
-
60 66 72 kHz
- ±3 - kHz
- 4 - ms
0 1 3%
- ±5 ±10 %
75 80 85 %
- - 0%
11 12 13 V
78 9V
0.7 0.9 1.1 mA
10 15 20 ms
- 300 -
ns
VBH
VBL
Vcc=14V
Vcc=14V
0.4 0.5 0.6
0.24 0.3 0.36
V
V
5
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CM0765R arduino
FSCM0765R
Functional Description
1. Startup : Figure 4 shows the typical startup circuit and
transformer auxiliary winding for FSCM0765R application.
Before FSCM0765R begins switching, FSCM0765R
consumes only startup current (typically 25uA) and the
current supplied from the DC link supply ccurrent consumed
by FPS (Icc) and charges the external capacitor (Ca) that is
connected to the Vcc pin. When Vcc reaches start voltage of
12V (VSTART), FSCM0765R begins switching, and the
current consumed by FSCM0765R increases to 3mA. Then,
FSCM0765R continues its normal switching operation and
the power required for this device is supplied from the
transformer auxiliary winding, unless Vcc drops below the
stop voltage of 8V (VSTOP). To guarantee the stable operation
of the control IC, Vcc has under voltage lockout (UVLO)
with 4V hysteresis. Figure 5 shows the relation between the
current consumed by FPS (Icc) and the supply voltage (Vcc).
CDC
The minimum current supplied through the startup resistor is
given by
Is
u
min
p
=
(
2
Vl
i
m
ne
i
n
Vstart)
R-----1s---t---r
where Vlinemin is the minimum input voltage, Vstart is the
start voltage (12V) and Rstr is the startup resistor. The startup
resistor should be chosen so that Isupmin is larger than the
maximum startup current (40uA). If not, Vcc can not be
charged to the start voltage and FPS will fail to start up.
2. Feedback Control : FSCM0765R employs current mode
control, as shown in Figure 6. An opto-coupler (such as the
H11A817A) and shunt regulator (such as the KA431) are
typically used to implement the feedback network.
Comparing the feedback voltage with the voltage across the
Rsense resistor makes it possible to control the switching
duty cycle. When the reference pin voltage of the KA431
exceeds the internal reference voltage of 2.5V, the
H11A817A LED current increases, thus pulling down the
feedback voltage and reducing the duty cycle. This event
typically happens when the input voltage is increased or the
output load is decreased.
AC line
(V
min
line
- Vlinemax)
Isup Rstr
FSCM0765R
Vcc
Icc
Da
Ca
Figure 4. Startup circuit
Icc
2.1 Pulse-by-pulse current limit: Because current mode
control is employed, the peak current through the Sense FET
is determined by the inverting input of PWM comparator
(Vfb*) as shown in Figure 6. When the current through the
opto transistor is zero and the current limit pin (#5) is left
floating, the feedback current source (IFB) of 0.9mA flows
only through the internal resistor (R+2.5R=2.8k). In this
case, the cathode voltage of diode D2 and the peak drain
current have maximum values of 2.5V and 3A, respectively.
The pulse-by-pulse current limit can be adjusted using a
resistor to GND on current limit pin (#5). The current limit
level using an external resistor (RLIM) is given by
ILIM = -2---.--8R---k--L---I-M----+-----3R---A--L---I-M---
3mA
Power Down
Power Up
25uA
Vstop=8V Vstart=12V
Vcc
Vz
Figure 5. Relation between operating supply current and
Vcc voltage
Vcc Vref
Idelay
IFB 0.9mA
Vo Vfb
H11A817A
4
CB
OSC
D1 D2
2.5R
0.3k
+
Vfb* R
KA431
5
-
SenseFET
Gate
driver
RLI M
VSD
OLP
Rsense
Figure 6. Pulse width modulation (PWM) circuit
11
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