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TOP103YAI PDF даташит

Спецификация TOP103YAI изготовлена ​​​​«Power Integrations» и имеет функцию, называемую «Three-terminal Off-line PWM Switch».

Детали детали

Номер произв TOP103YAI
Описание Three-terminal Off-line PWM Switch
Производители Power Integrations
логотип Power Integrations логотип 

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TOP103YAI Даташит, Описание, Даташиты
TOP100-4
TOPSwitch® Family
Three-terminal Off-line PWM Switch
®
Product Highlights
Low Cost Replacement for Discrete Switchers
• 20 to 50 fewer components - cuts cost, increases reliability
• Source-connected tab and Controlled MOSFET turn-on
reduce EMI and EMI filter costs
• Allows for a 50% smaller and lighter solution
• Cost competitive with linears above 5 W
Up to 90% Efficiency in Flyback Topology
• Built-in start-up and current limit reduce DC losses
• Low capacitance 350 V MOSFET cuts AC losses
• CMOS controller/gate driver consumes only 6 mW
• 70% maximum duty cycle minimizes conduction losses
Simplifies Design - Reduces Time to Market
• Supported by many reference designs
• Integrated PWM Controller and 350 V MOSFET in a
industry standard three pin TO-220 package
• Only one external capacitor needed for compensation,
bypass and start-up/auto-restart functions
System Level Fault Protection Features
• Auto-restart and cycle by cycle current limiting functions
handle both primary and secondary faults
• On-chip latching thermal shutdown protects the entire
system against overload
Highly Versatile
• Implements Buck, Boost, Flyback or Forward topology
• Easily interfaces with both opto and primary feedback
• Supports continuous or discontinuous mode of operation
• Specified for operation down to 16 V DC input
Description
The TOPSwitch family implements, with only three pins, all
functions necessary for an off-line switched mode control
system: high voltage N-channel power MOSFET with controlled
turn-on gate driver, voltage mode PWM controller with
integrated 100 kHz oscillator, high voltage start-up bias circuit,
bandgap derived reference, bias shunt regulator/error amplifier
for loop compensation and fault protection circuitry. Compared
to discrete MOSFET and controller or self oscillating (RCC)
switching converter solutions, a TOPSwitch integrated circuit
can reduce total cost, component count, size, weight and at the
same time increase efficiency and system reliability. These
AC
IN
DRAIN
SOURCE
CONTROL
TOPSwitch
Figure 1. Typical Application.
PI-1704112995
TOPSwitch SELECTION GUIDE
ORDER
PART
NUMBER
OUTPUT POWER RANGE
FLYBACK
PFC/
BOOST
100/110 V
VAC
48 V
DC
100/110
VAC
TOP100YAI* 0-20 W 0-6.8 W 0-30 W
TOP101YAI* 15-35 W 6-12 W 25-50 W
TOP102YAI* 20-45 W 8.5-17 W 35-70 W
TOP103YAI* 25-55 W 11-22 W 45-90 W
TOP104YAI* 30-60 W 12-25 W 55-110 W
* Package Outline: Y03A
devices are intended for 100/110 VAC off-line Power Supply
applications in the 0 to 60 W range and power factor correction
(PFC) applications in the 0 to 110 W range. They are also well
suited for Telecom, Cablecom and other DC to DC converter
applications in the 0-25 W range (see Design Note DN-16).
July 1996









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TOP103YAI Даташит, Описание, Даташиты
TOP100-4
CONTROL
VC
0
ZC
SHUNT REGULATOR/
ERROR AMPLIFIER
-
+ 5.7 V
5.7 V
4.7 V
1
SHUTDOWN/
AUTO-RESTART
+
-
POWER-UP
RESET
EXTERNALLY
TRIGGERED
SHUTDOWN
IFB THERMAL
SHUTDOWN
INTERNAL
SUPPLY
÷8
RQ
SQ
OSCILLATOR
DMAX
CLOCK
SAW
-
+
PWM
COMPARATOR
SQ
RQ
RE
Figure 2. Functional Block Diagram.
DRAIN
+
- VILIMIT
CONTROLLED
TURN-ON
GATE
DRIVER
LEADING
EDGE
BLANKING
MINIMUM
ON-TIME
DELAY
SOURCE
PI-1746-011796
Pin Functional Description
DRAIN Pin:
Output MOSFET drain connection. Provides internal bias
current during start-up operation via an internal switched high-
voltage current source. Internal current sense point.
CONTROL Pin:
Error amplifier and feedback current input pin for duty cycle
control. Internal shunt regulator connection to provide internal
bias current during normal operation. Trigger input for latching
shutdown. It is also used as the supply bypass and auto-restart/
compensation capacitor connection point.
SOURCE Pin:
Output MOSFET source connection. Primary-side circuit
common, power return, and reference point.
DRAIN
SOURCE (TAB)
CONTROL
TO-220/3 (YO3A)
Figure 3. Pin Configuration.
PI-1065A-110194
2E
7/96









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TOP103YAI Даташит, Описание, Даташиты
TOP100-4
TOPSwitch Family Functional Description
TOPSwitch is a self biased and protected
linear control current-to-duty cycle
converter with an open drain output.
High efficiency is achieved through the
use of CMOS and integration of the
maximum number of functions possible.
CMOS significantly reduces bias
currents as compared to bipolar or
discrete solutions. Integration eliminates
external power resistors used for current
sensing and/or supplying initial start-up
bias current.
Auto-restart
DMAX
IB
Slope = PWM Gain
-16%/mA
During normal operation, the internal
output MOSFET duty cycle linearly
decreases with increasing CONTROL
pin current as shown in Figure 4. To
implement all the required control, bias,
and protection functions, the DRAIN
and CONTROL pins each perform
several functions as described below.
Refer to Figure 2 for a block diagram
and Figure 6 for timing and voltage
waveforms of the TOPSwitch integrated
circuit.
Control Voltage Supply
CONTROL pin voltage V is the supply
C
or bias voltage for the controller and
driver circuitry. An external bypass
capacitor closely connected between the
CONTROL and SOURCE pins is
required to supply the gate drive current.
The total amount of capacitance
connected to this pin (C ) also sets the
T
auto-restart timing as well as control
loop compensation. VC is regulated in
either of two modes of operation.
Hysteretic regulation is used for initial
start-up and overload operation. Shunt
regulation is used to separate the duty
cycle error signal from the control circuit
supply current. During start-up, V
C
current is supplied from a high-voltage
switched current source connected
internally between the DRAIN and
CONTROL pins. The current source
provides sufficient current to supply the
control circuitry as well as charge the
total external capacitance (CT).
DMIN
ICD1 2.5
6.5
IC (mA)
Figure 4. Relationship of Duty Cycle to CONTROL Pin Current.
45
PI-1691-112895
5.7 V
4.7 V
VC
0
IC
Charging CT
DRAIN VIN
0
Off
5.7 V
VC 4.7 V
0
IC
Charging CT
Switching
(a)
ICD1
Discharging CT
ICD2
Discharging CT
8 Cycles
95%
5%
DRAIN VIN
0
Off Off
Off
Switching
(b)
Switching
CT is the total external capacitance
connected to the CONTROL pin
PI-1124A-060694
Figure 5. Start-up Waveforms for (a) Normal Operation and (b) Auto-restart.
3E
7/96










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