POWERINT PKS606P

PKS603-607
PeakSwitch™ Family
Enhanced, Energy-Efficient, Off-Line Switcher
IC With Super Peak Power Performance
Product Highlights
®
EcoSmart – Extremely Energy-Efficient
• Standby output power ≥0.6 W for 1 W input (high line)
• Sleep mode power ≥2.4 W at 3 W input (high line)
• No-load consumption <200 mW at 265 VAC input
• Surpasses California Energy Commission (CEC),
ENERGY STAR, and EU requirements
PeakSwitch Features Reduce System Cost
• Delivers peak power of up to three times maximum
continuous output power
• 277 kHz operation during peak power significantly
reduces transformer size
• Programmable smart AC line sensing provides latching
shutdown during short circuit, overload and open loop
faults, and prevents glitches during power down or
brownout
• Two external components reset latch on AC removal
• Adaptive switching cycle on-time extension increases low
line peak output power, minimizing bulk capacitor size
• Adaptive current limit reduces output overload power
• Frequency jittering reduces EMI filter cost
• Tight I2f tolerances and negligible temperature variation
of key parameters ease design and lower cost
• Accurate hysteretic thermal shutdown with automatic
recovery provides complete system level overload
protection and eliminates need for manual reset
Better System Cost/Performance over RCC & Discrete
• Simple ON/OFF control – no loop compensation needed
• Very low component count – higher reliability and single
side printed circuit board
• High bandwidth provides fast turn on with no overshoot
and excellent transient load response
• Peak current limit operation rejects line frequency ripple
• Built-in current limit and hysteretic thermal protection
Applications
• Inkjet printer
• Data storage, audio amplifier, DC motor drives
Description
PeakSwitch is designed to address applications with high peakto-continuous power ratio demands. The very high switching
frequency during peak power loads and excellent load transient
response reduce system cost as well as component count and size.
PeakSwitch incorporates a 700 V power MOSFET, oscillator,
high voltage switched current source for startup, current limit,
+
AC
IN
DC
OUT
Optional Smart
AC Sense
D
EN/UV
BP
PeakSwitch
S
PI-3995-051006
Figure 1. Typical Peak Power Application.
PRODUCT3
PKS603 P
PKS604 P
PKS604 Y/F
PKS605 P
PKS605 Y/F
PKS606 P
PKS606 Y/F
PKS607 Y/F
OUTPUT POWER TABLE
85-265 VAC
230 VAC ±15%
Adapter Adapter Adapter Adapter
Cont.1
Peak2
Cont.1
Peak2
13 W
23 W
35 W
31 W
46 W
35 W
68 W
75 W
32 W
56 W
56 W
60 W
79 W
66 W
117 W
126 W
9W
16 W
23 W
21 W
30 W
25 W
45 W
50 W
25 W
44 W
44 W
44 W
58 W
46 W
86 W
93 W
Table 1.
Notes:
1. Typical continuous power in a non-ventilated enclosed adapter
measured at +50 °C ambient.
2. Typical peak power for a period of 100 ms and a duty cycle of
10% in a non-ventilated enclosed adapter measured at +50 °C
(see Key Applications section for details).
3. See Part Ordering Information.
and thermal shutdown onto a monolithic device. In addition,
these devices incorporate auto-restart, line under-voltage sense
and frequency jittering. An innovative design minimizes audio
frequency components in the simple ON/OFF control scheme
to practically eliminate audible noise with standard varnished
transformer construction.
October 2006
PKS603-607
BYPASS
(BP)
DRAIN
(D)
REGULATOR
5.8 V
LINE UNDER-VOLTAGE
240 µA
25 µA
LATCH OFF/
AUTORESTART
COUNTER
ON TIME EXT
RESET
6.3 V
FAULT
PRESENT
+
CURRENT
LIMIT STATE
MACHINE/
ADAPTIVE
CURRENT
LIMIT
BYPASS PIN
UNDER-VOLTAGE
-
5.8 V
4.8 V
VI
LIMIT
CURRENT LIMIT
COMPARATOR
ENABLE
+
JITTER
CLOCK
1.0 V + VT
THERMAL
SHUTDOWN
DCMAX
OSCILLATOR
ENABLE/
UNDERVOLTAGE
(EN/UV)
1.0 V
S
Q
R
Q
LEADING
EDGE
BLANKING
SOURCE
(S)
GROUND (GND)
(Y & F Package
Only)
PI-3940-040606
Figure 2. Functional Block Diagram.
Pin Functional Description
Y Package (TO-220-7C)
DRAIN (D) Pin:
The power MOSFET drain connection provides internal
operating current for both startup and steady-state operation. BYPASS (BP) Pin:
A 0.33 µF external bypass capacitor for the internally generated
5.8 V supply is connected to this pin. In typical applications,
this pin must be externally supplied via a bias winding.
7D
Tab Internally
Connected to
SOURCE Pin
5 NC
4S
3 EN/UV
2 GND
1 BP
P Package (DIP-8C)
F Package (TO-262-7C)
ENABLE/UNDER-VOLTAGE (EN/UV) Pin:
This pin has dual functions: enable input and line under-voltage
sense. During normal operation, switching of the power MOSFET
is controlled by this pin. MOSFET switching is disabled when a
current greater than 240 µA is drawn from this pin. This pin may
also sense line under-voltage conditions through either an
external resistor connected to the DC line voltage or an AC
sense circuit. Figure 3. Pin Configuration.
SOURCE (S) Pin:
This is the MOSFET source connection for high voltage return
and control circuit common.
GROUND (GND) Pin (Y or F Package Only):
This is the signal ground for the bypass capacitor and
optocoupler.
Rev. I 10/06
BP
EN/UV
D
1
2
4
8
S
7
S
6
S
5
S
7D
5 NC
4S
3 EN/UV
2 GND
1 BP
PI-3941-031506
PKS603-607
PeakSwitch Functional Description
PeakSwitch integrates a 700 V power MOSFET switch with a
power supply controller on the same die. Unlike conventional
pulse width modulation (PWM) controllers, PeakSwitch uses a
simple ON/OFF control to regulate the output voltage.
The controller consists of an oscillator, enable
circuit (sense and logic), current-limit state machine,
5.8 V regulator, BYPASS pin under-voltage circuit, over-
temperature protection, current limit circuit, and leading
edge blanking. PeakSwitch incorporates additional circuitry
for adaptive current limit, line under-voltage sense,
programmable smart line sense, auto-restart, adaptive
switching cycle on-time extension, and frequency jitter. Figure 2 is a functional block diagram of the device’s most
important features.
Oscillator
The typical oscillator frequency is internally set to an average
of 277 kHz. Two signals are generated from the oscillator: the
maximum duty cycle (DCMAX) signal and the clock signal that
indicates the beginning of each cycle.
The oscillator incorporates circuitry that introduces a small
amount of frequency jitter, typically 16 kHz peak-to-peak, to
minimize EMI emission. The modulation rate of the frequency
jitter is set to 1.1 kHz to optimize EMI reduction for both
average and quasi-peak emissions. The frequency jitter should
be measured with the oscilloscope triggered at the falling edge
of the DRAIN waveform. The waveform in Figure 4 illustrates
the frequency jitter.
Enable Input and Current-Limit State Machine
The enable input circuit at the EN/UV pin consists of a low
impedance source follower output set at 1.0 V. The current
PI-3942-022806
600
500
VDRAIN
400
300
through the source follower is limited to 240 µA. When the
current out of this pin exceeds 240 µA, a low logic level
(disable) is generated at the output of the enable circuit. This
enable circuit output is sampled at the beginning of each
cycle on the rising edge of the clock signal. If high, the power
MOSFET is turned on for that cycle (enabled). If low, the power
MOSFET remains off (disabled). Since the sampling is done
only at the beginning of each cycle, subsequent changes in the
EN/UV pin voltage or current during the remainder of the
cycle are ignored.
The current-limit state machine reduces the current limit by
discrete amounts at light loads when PeakSwitch is likely to
switch in the audible frequency range. The lower current limit
raises the effective switching frequency above the audio range
and reduces the transformer flux density, including the associated
audible noise. The state machine monitors the sequence of
EN/UV pin voltage levels to determine the load condition and
adjusts the current limit level accordingly in discrete amounts.
Under most operating conditions (except when close to no-load),
the low impedance of the source follower keeps the voltage on
the EN/UV pin from going much below 1.0 V in the disabled
state. This improves the response time of the optocoupler that
is usually connected to this pin.
5.8 V Regulator and 6.3 V Shunt Voltage Clamp
The 5.8 V regulator charges the bypass capacitor connected to
the BYPASS pin to 5.8 V by drawing a current from the voltage
on the DRAIN pin whenever the MOSFET is off. The BYPASS
pin is the internal supply voltage node. When the MOSFET
is on, the PeakSwitch operates from the energy stored in the
bypass capacitor. The voltage on the DRAIN pin powers the
bypass during start-up.
There is a 6.3 V shunt regulator clamping the BYPASS pin at
6.3 V when current is provided through an external resistor
from the bias winding in normal operation. Powering the PeakSwitch device in this way minimizes no-load consumption
to about 150 mW at 265 VAC. Note that a bias winding must be
used to power the device. See Key Application Considerations
section for details.
BYPASS Pin Under-Voltage
The BYPASS pin under-voltage circuitry disables the power
MOSFET when the BYPASS pin voltage drops below 4.8 V. Once the BYPASS pin voltage drops below 4.8 V, it must rise
back to 5.8 V to enable (turn on) the power MOSFET.
200
100
0
285 kHz
269 kHz
0
2.5
Time (µs)
Figure 4. Frequency Jitter.
5
Over Temperature Protection
The thermal shutdown circuitry senses the die temperature. The threshold is typically set at 142 °C with 75 °C hysteresis. When the die temperature rises above this threshold, the
power MOSFET is disabled and remains disabled until the die
temperature falls by 75 °C, at which point it is re-enabled. A large
Rev. I 10/06
PKS603-607
hysteresis of 75 °C (typical) is provided to prevent overheating
of the PC board during a continuous fault condition.
Current Limit
The current limit circuit senses the current in the power MOSFET. When this current exceeds the internal threshold (ILIMIT), the
power MOSFET is turned off for the remainder of that cycle. The
current limit state machine reduces the current limit threshold
by discrete amounts under medium and light loads.
The leading edge blanking circuit inhibits the current limit
comparator for a short time (tLEB) after the power MOSFET is
turned on. This leading edge blanking time has been set so that
current spikes caused by capacitance and secondary-side rectifier
reverse recovery time will not cause premature termination of
the MOSFET conduction portion of the switching cycle.
1. Startup
2. UV Resistor
Present?
Line Under-Voltage Sense Circuit
The line under-voltage circuit prevents startup below the
programmed input voltage by connecting an external resistor
from either the DC line or from an AC sense circuit (see
Figure 1) to the EN/UV pin. The complete function is described
in the flow chart shown in Figure 5. During power up or when
the switching of the power MOSFET is disabled in auto-restart,
the current flowing into the EN/UV pin must exceed 25 µA to
initiate switching of the power MOSFET. During power up,
once the threshold is exceeded, the Bypass pin must charge from
4.8 V to 5.8 V before MOSFET switching is initiated.
The line under-voltage circuit also detects when there is no
external resistor connected to the EN/UV pin (less than ~1 µA
into pin). In this case, the line under-voltage function is disabled
and the device operates with a normal auto-restart function.
Programmable Smart AC Line Sense
When an external AC sense circuit is used (see Figure 1), the line
under-voltage sense circuit can be used to determine the reason
for a loss of feedback signal at the EN/UV pin. In the event of
a fault condition such as output overload, output short circuit,
or an open loop condition, the power MOSFET switching is
disabled after the EN/UV pin is not pulled low for 30 ms. If the
AC line is present (IEN > 25 µA) at the time switching is disabled,
Rev. I 10/06
9. Start Switching
Yes
No
No
During startup and fault conditions, the controller prevents
excessive drain currents by reducing the switching
frequency.
Adaptive Current Limit
When switching in the full current limit state, a skipped cycle
followed by a cycle that terminates at the full current limit
implies that the line voltage is at high line. Under this condition,
adaptive current limit reduces the full current limit level by
approximately 10% in order to reduce output overload power.
The next skipped cycle disables the adaptive current limit
condition and restores the full current limit level.
No
3. AC Input
Present?
(IEN>25 µA)
10. No Feedback
>30 ms?
Yes
Yes
4. Start Switching
No
11. Stop Switching
(for 5 s)
5. No Feedback
>30 ms?
Yes
6. Stop Switching
Yes
7. AC Input
Present?
(IEN>25 µA)
Note: Normal operation
(no fault present) is denoted
by looping with a “No” response
at decision box 5 or 10.
No
8. Reset A/R Latch
PI-4014-062305
Figure 5. PeakSwitch Line Sense Function Flow Chart.
PI-3943-031506
PKS603-607
VDRAIN
300
peak output power was required in low line conditions. On-time
extension is disabled during the startup of the power supply.
200
PeakSwitch Operation
100
PeakSwitch devices operate in the current-limit mode. When
enabled, the oscillator turns the power MOSFET on at the
beginning of each cycle. The MOSFET is turned off when the
current ramps up to the current limit or when the DCMAX limit
is reached. Since the highest current limit level and frequency
0
10
VDC-OUTPUT
5
0
0
5
V
EN
10
Time (s)
CLOCK
Figure 6. PeakSwitch Auto-Restart Operation.
the line under-voltage sense circuit prevents a
restart attempt until the AC input voltage is removed
(IEN <25 µA). Then the internal auto-restart latch is reset and
the power MOSFET switching will resume once the AC input
voltage is applied again (IEN >25 µA). This effectively provides
a latching shutdown function with AC reset during such a fault
condition.
When a brownout or line sag occurs, output regulation may be
lost and the EN/UV pin will receive no feedback (it is pulled
low). After 30 ms of no feedback, MOSFET switching is disabled.
Since the AC line is abnormally low (IEN <25 mA) MOSFET
switching remains disabled until normal line voltage is restored.
The power MOSFET switching will resume once the AC input
returns to normal (IEN >25 µA). This effectively disables the
latching shutdown function during such a condition.
Auto-Restart (UV resistor not present)
In the event of a fault condition such as output overload,
output short circuit or an open loop condition, PeakSwitch
enters into auto-restart operation. An internal counter
clocked by the oscillator is reset every time the EN/UV pin
is pulled low. When the EN/UV pin receives no feedback
for 30 ms, the power MOSFET switching is disabled for
5 seconds (150 ms for the first auto-restart event). The
auto-restart alternately enables and disables the switching
of the power MOSFET until the fault condition is removed.
Figure 6 illustrates auto-restart circuit operation in the presence
of an output short circuit.
Adaptive Switching Cycle On-time Extension
Adaptive switching cycle on-time extension keeps the MOSFET
on until current limit is reached, instead of terminating after
the DCMAX signal goes low. This on-time extension is adaptive
because it only occurs after the ENABLE pin has been high
for approximately 750 µs, a condition that would arise if the
D
MAX
I DRAIN
V DRAIN
PI-2749-050301
Figure 7. PeakSwitch Operation at Near Maximum Loading.
V
EN
CLOCK
D
MAX
I DRAIN
V DRAIN
PI-2667-090700
Figure 8. PeakSwitch Operation at Moderately Heavy Loading.
Rev. I 10/06
PKS603-607
of a PeakSwitch design are constant, the power delivered
to the load is proportional to the primary inductance of the
transformer and peak primary current squared. Hence, designing
the supply involves calculating the primary inductance of the
transformer for the maximum output power required. If the
chosen PeakSwitch family member is appropriate for the power
level, the current in the calculated inductance will ramp up to
current limit before the DCMAX limit is reached.
Enable Function
PeakSwitch senses the EN/UV pin to determine whether or not
to proceed with the next switching cycle as described earlier. The sequence of cycles is used to determine the current limit.
Once a cycle is started, it always completes the cycle (even when
the EN/UV pin changes state half way through the cycle). This
operation results in a power supply in which the output voltage
ripple is determined by the output capacitor, amount of energy
per switch cycle and the delay of the feedback.
low. The Zener diode can be replaced by a TL431 reference
circuit for improved accuracy.
ON/OFF Operation with Current-Limit State Machine
The internal clock of the PeakSwitch runs all the time. At the
beginning of each clock cycle, it samples the EN/UV pin to
decide whether or not to implement a switch cycle, and based
on the sequence of samples over multiple cycles, it determines
the appropriate current limit. At high loads, when the EN/UV
pin is high (less than 240 µA out of the pin), a switching cycle
with the full current limit occurs. At lighter loads, when EN/UV
is high, a switching cycle with a reduced current limit occurs. V
EN
CLOCK
The EN/UV pin signal is produced on the secondary by
comparing the power supply output voltage with a reference
voltage. The EN/UV pin signal is high when the power supply
output voltage is less than the reference voltage.
D
In a typical implementation, the EN/UV pin is driven by an
optocoupler. The collector of the optocoupler transistor is
connected to the EN/UV pin and the emitter is connected to the SOURCE pin. The optocoupler LED is connected in series
with a Zener diode across the DC output voltage to be regulated.
When the output voltage exceeds the target regulation voltage
level (optocoupler LED voltage drop plus Zener voltage), the
optocoupler LED will start to conduct, pulling the EN/UV pin
MAX
I DRAIN
V DRAIN
PI-2661-072400
Figure 10. PeakSwitch Operation at Very Light Loading.
V
EN
D
V
100
PI-4331-031506
200
CLOCK
DC-INPUT
0
MAX
5
0
I DRAIN
V
BYPASS
300
200
100
V DRAIN
V
DRAIN
0
0
5
Time (ms)
PI-2377-091100
Figure 9. PeakSwitch Operation at Medium Loading.
Rev. I 10/06
Figure 11. PeakSwitch Power Up with Optional External UV Resistor (4 MW) Connected to EN/UV Pin.
10
100
PI-4332-031506
200
V
DC-INPUT
0
200
V
DC-INPUT
100
5
0
V
BYPASS
0
400
Modifying current schematic
300
300
V
DRAIN
200
200
100
100
V
DRAIN
0
0
0
5
10
PI-2348-030801
Figure 12. PeakSwitch Power Up Without Optional External UV Resistor Connected to EN/UV Pin.
200
V
100
DC-INPUT
0
400
300
V
DRAIN
200
0
2.5
5
Time (s)
Time (ms)
100
0
0
PI-2395-030801
PKS603-607
.5
1
Time (s)
Figure 13. Normal Power Down Timing (Without UV).
At maximum peak load, PeakSwitch will conduct during nearly
all of its clock cycles (Figure 7). At the rated continuous load,
it will “skip” additional cycles in order to maintain voltage
regulation at the power supply output (Figure 8). At medium
loads, cycles will be skipped and the current limit will be
reduced (Figure 9). At very light loads, the current limit will
be reduced even further (Figure 10). Only a small percentage
of cycles will occur to satisfy the internal power consumption
of the power supply at no-load.
The response time of the ON/OFF control scheme is very
fast compared to normal PWM control. This provides
tight regulation and excellent transient response.
Figure 14. Slow Power Down Timing With Optional External (4 MW) UV Resistor Connected to EN/UV Pin.
Power Up/Down
The PeakSwitch requires only a 0.33 mF capacitor on the
BYPASS pin. Because of its small size, the time to charge this
capacitor is kept to an absolute minimum, typically less than
1.5 ms. Due to the fast nature of the ON/OFF feedback, there
is no overshoot at the power supply output. When an external
resistor is connected from the positive DC input to the EN/UV
pin, the power MOSFET switching will be delayed during power up until the DC line voltage exceeds the threshold (100 V).
Figures 11 and 12 show the power up timing waveform in
applications with and without an external resistor (4 MΩ)
connected to the EN/UV pin.
During power down, when an external resistor is used, the
power MOSFET will switch for 30 ms after the output loses
regulation. The power MOSFET will then remain off without
any glitches since the under-voltage function prohibits restart
when the line voltage is low.
Figure 13 illustrates a typical power-down timing waveform. Figure 14 illustrates a very slow power-down timing waveform
as in standby applications. An external resistor is connected to
the EN/UV pin in this case to prevent unwanted restarts.
Current Limit Operation
Each switching cycle is terminated when the DRAIN current
reaches the current limit of the PeakSwitch. Current limit
operation provides good line ripple rejection.
BYPASS Pin Capacitor
The BYPASS pin uses a small 0.33 uF ceramic capacitor for
decoupling the internal power supply.
Rev. I 10/06
PKS603-607
R8
68 Ω C11
1/2 W 330 pF
C10
1 nF
250 VAC
R9
C13
47 µF 0.33 Ω
2W
16 V
D9
1N4148
C17
4.7 nF
1 kV
C5
2.2 nF
1 kV
VR1
1N4764A
100 V
7,8
L1
5.3 mH
R2
R1
1.3 MΩ 1.3 MΩ
F1
3.15 A
C1-C2
100 pF
250 VAC
R5
2.2 MΩ
R6
2.4 MΩ
O
PeakSwitch
D
U1
PKS606Y
C7
100 nF
400 V
C6
47 µF
35 V
2
S
R12
1 kΩ
R7
4.7 kΩ
C15
100 nF
50 V
R11
3 kΩ
R10
1.5 kΩ
R16
2.7 MΩ
C16
100 nF
EN/UV
GND
C8
220 nF
50 V
RTN Connected to PE via Flying Lead
PE
VR3
1N5258B
36 V
D7
1N4148
T1
EE25
BP
D10
UF4003
Q2
FS202DA
5
U2
PC817X4
J1
L
VR2
1N5255B
28 V
RTN
D6
FR106
t
RT1
10 Ω
Q1
2N3906
4
R4
22 Ω
1/2 W
D5
1N4007
C12
330 µF
50 V
R3
10 kΩ
1/2 W 3
R15
2.2 Ω
C3
680 nF
X1
D8
STPS3150
1
C4
150 µF
400 V
D1-D4
1N4007
9,10
30 V @
C14
L2 220 nF 1.07 A Cont.
2.7 A Peak
5.3 µH 50 V
C19
1 nF, 250 VAC
R14
100 Ω
R13
1 kΩ
J3
PCB Term 18 AWG
PI-4170-060706
N
Figure 15. PeakSwitch PKS606Y, 32 W Continuous, 81 W Peak, Universal Input Power Supply.
Application Example
The circuit shown in Figure15 is a low cost, high efficiency,
flyback power supply designed to provide a 30 V, 1.06 A
continuous, 2.7 A peak output from universal input using the
PKS606Y.
The supply features under-voltage lockout and smartAC sense with
fast reset. Latching overload, open loop, and hysteretic thermal
shutdown protect both the supply and load under fault conditions
while high efficiency (>80%) and very low no-load consumption
(<200 mW at 230 VAC) meets both active and standby efficiency
requirements. Output regulation is accomplished using a simple
Zener reference and opto coupler feedback.
Components C1, C2, C3, C10, C17, C19, R15, L1 and L2 provide
common mode and differential mode EMI filtering. Resistors
R1 and R2 discharge C3 when AC power is removed to prevent
electric shock from touching the AC input. Thermistor RT1
limits the peak inrush current when AC is first applied.
The rectified and filtered input voltage is applied to the primary
winding of T1. The other side of the transformer primary is
driven by the integrated MOSFET in U1. Diode D6, C5, R3,
R4, and VR1 clamp the U1 drain voltage to safe levels. Use
of a fast diode (500 ns) vs ultrafast for D6 increases power
supply efficiency by recovering some of the clamp energy. A
slow or standard recovery diode must not be used due to the
Rev. I 10/06
high switching frequency (a slow diode will not recover fast
enough under startup or output faults and therefore fail due
to excess dissipation). The use of a Zener in series with R3
compared to a standard RCD clamp optimizes both EMI and
energy efficiency.
Components D5, C7, and R5-6 provide AC line and undervoltage sensing for PeakSwitch U1. By providing a separate
rectified voltage across C7 which is independent from the load
condition, rather than using the main input capacitor, allows
PeakSwitch to distinguish the cause of loss of regulation. It
also provides fast reset when the AC input is removed, should
latching shutdown be triggered. Connecting R5 and R6 to C4
would still provide under-voltage lockout but after a fault the
user would have to wait for C4 to discharge before the supply
would reset. Resistor R16 provides a small amount of bias to
the U1 ENABLE/UNDER-VOLTAGE pin to retain the undervoltage lockout function during brown-out conditions.
With R5 and R6 present, switching is inhibited until the current
into the EN/UV pin exceeds 25 µA. This allows the startup
voltage to be programmed within the normal operating input
voltage range, preventing glitching of the output under abnormal,
low voltage conditions and also on removal of the AC input.
Under a fault condition, for example an output short circuit or
broken feedback loop, if the line voltage is within the normal
range (>25 mA into the EN/UV pin) the PeakSwitch will latch
PKS603-607
off the power supply. This protects the load and supply from
a continuous fault condition. Removing the AC input resets
this condition.
The output voltage is determined by the Zener diode VR2, the
voltage drop across R12 and the forward drop of D9 and the LED
of optocoupler U2. Resistor R13 provides bias current through
D9 and VR2, to ensure that VR2 is operating close to its knee
voltage, while R12 sets the overall gain of the feedback loop.
Capacitor C15 boosts high frequency loop gain to help distribute
the enabled switching cycles and reduce pulse grouping.
When the output voltage exceeds the feedback threshold voltage,
current will flow in the optocoupler LED, causing current flow in
the transistor of the optocoupler. When this exceeds the ENABLE
pin threshold current the next switching cycle is inhibited, as the
output voltage falls (below the feedback threshold) a conduction
cycle is allowed to occur and by adjusting the number of enabled
cycles output regulation is maintained. As the load reduces
the number of enabled cycles decreases, lowering the effective
switching frequency and scaling switching losses with load. This provides almost constant efficiency down to very light
loads, ideal for meeting energy efficiency requirements.
PeakSwitch device U1 is supplied from an auxillary winding
on the transformer which is rectified and filtered by D7 and C6. Resistor R7 provides approximately 2 mA of supply current into
the BYPASS pin capacitor C8. During startup or fault conditions
when the bias voltage is low, the BYPASS pin is supplied from
a high voltage current source within U1, eliminating the need
for separate startup components.
Components Q1-2, R9-11, R14, C13, C16, and VR3 form
an overvoltage and overcurrent protection circuit. An output
overvoltage or overcurrent condition fires SCR Q2, clamping
the output voltage and forcing PeakSwitch U1 into latching
shutdown after 30 ms. The low pass filter formed by R10 and
C13 adds a delay to the over-current sense. The shutdown
condition can be reset by briefly removing AC power for ~3
seconds (maximum). The latching function within PeakSwitch
significantly reduces the size of the SCR and output rectifier,
D8, as the short circuit current only flows for 50 ms before the
supply latches off.
This design meets EN55022 Class B conducted EMI with
>10 dB margin even with the output RTN directly connected
to earth ground.
Key Application Considerations
PeakSwitch Design Considerations
Output Power Table
The data sheet maximum output power table (Table 1) represents
the maximum practical continuous output power level that can
be obtained under the following assumed conditions:
1. The minimum DC input voltage is 100 V or higher for
85 VAC input, or 220 V or higher for 230 VAC input or
single 100/115 VAC with a voltage doubler.
2. Efficiency of 70% for Y/F packaged devices, 75% for P
packaged devices at 85-265 VAC, 75% for 230 VAC input
all packages
3. Minimum datasheet value of I2f
4. Transformer primary inductance tolerance of ±10%
5. Reflected output voltage (VOR) of 135 V
6. Voltage only output of 15 V with an ultra fast PN rectifier
diode
7. Continuous conduction mode operation with transient KP*
value of 0.25
8. Sufficient heatsinking is provided, either externally (Y/F
packages) or through an area of PC board copper (P package)
to keep the SOURCE pin or tab temperature at or below
110 °C.
9. Device ambient temperature of 50 °C for open frame designs
and 40 °C for sealed adapters
*Below a value of 1, KP is the ratio of ripple to peak primary
current. To prevent reduced power capability due to premature
termination of switching cycles, a transient KP limit of ≥0.25 is
recommended. This avoids the initial current limit (IINIT) being
exceeded at MOSFET turn on.
Peak vs. Continuous Power
PeakSwitch devices have current limit values that allow the
specified peak power values in the power table. With sufficient
heatsinking, these power levels could be provided continuously,
however this may not be practical in many applications. PeakSwitch is optimized for use in applications that have short
duration, high peak power demand, but a significantly lower
continuous or average power. Typical ratios would be PPEAK ≥
2 × PAVE. The high switching frequency of PeakSwitch allows
a small core size to be selected to deliver the peak power,
but the short duration prevents the transformer winding from
overheating. As average power increases, it may be necessary to
select a larger transformer to allow increased copper area for the
windings based on the measured transformer temperature.
The power table provides some guidance between peak
power and continuous power in sealed adapters, however
specific applications may differ. For example, if the peak
power condition is very low duty cycle, say a 2 second peak
occurring only at power up to accelerate a hard disk drive,
then the transformer’s thermal rise is only a function of the
continuous power. However, if the peak power occurs every
200 ms for 50 ms then it would need to be considered.
In all cases, the acceptable temperature rise of the PeakSwitch
and transformer should be verified under worst case ambient
and load conditions.
Rev. I 10/06
PKS603-607
provides sufficient margin to prevent core saturation under
startup or output short circuit conditions.
Power (W)
P3
Optocoupler CTR
To minimize the delay introduced by the optocoupler, it is
recommended that a high (300-600%) CTR optocoupler is used
in PeakSwitch designs.
PI-4329-030906
P2
P1
∆t1
∆t2
Time (t)
T
Figure 16. Continuous (Average) Output Power Calculation Example.
Figure 16 shows how to calculate the average power
requirements for a design with two different peak load conditions.
Where PX are the different output power conditions, ΔtX are the
durations of each peak power condition, and T is the period of
one cycle of the pulse load condtion.
Audible Noise
The cycle skipping mode of operation used in PeakSwitch
can generate audio frequency components in the transformer. To limit this audible noise generation, the transformer should
be designed such that the peak core flux density is below
3000 Gauss (300 mT). Following this guideline and using the
standard transformer production technique of dip varnishing
practically eliminates audible noise. Vacuum impregnation
of the transformer should not be used due to the high primary
capacitance and increased losses that result.
Ceramic capacitors that use dielectrics such as Z5U, when used
in clamp circuits, may also generate audio noise. If this is the
case try replacing them with a capacitor having a different type of
dielectric or construction, for example a film type capacitor.
Maximum Flux Density
A maximum value of 3000 Gauss during normal operation is
recommended to limit the maximum flux density under start
up and output short circuit. Under these conditions the output
voltage is low and little reset of the transformer occurs during
the MOSFET off time. This allows the transformer flux density
to staircase above the normal operating level. A value of
3000 Gauss at the peak current limit of the selected device,
together with the built in protection features of PeakSwitch
10
Rev. I 10/06
Bias Winding
All PeakSwitch designs must use a bias winding to feed operating
current into the BYPASS pin once the supply is operational. It is recommended that the value of the resistor from the bias
winding to the BYPASS pin be selected such that it supplies the
same current as the maximum datasheet drain supply current
(IS2) for the specific device being used.
PeakSwitch Layout Considerations
See Figure 17 for a recommended circuit board layout for
PeakSwitch.
Single Point Grounding
Devices in Y and F packages have separate return pins for the
MOSFET source (S) and the controller (GND) connections
which are internally connected. Therefore connecting these
pins on the PC board is not recommended.
Devices in the P package do not have separate return pins,
but in both cases the low current feedback signals and IC
decoupling, high MOSFET current and bias winding primary
return connection should route through separate traces to the
Kelvin connection.
The bias winding return connection is treated separately, even
though it carries low current. To route high currents away from
the device when the supply is subjected to line surge transients,
the bias winding should be returned directly to the input bulk
capacitor.
Bypass Capacitor (CBP)
The BYPASS pin capacitor should be located as close as possible
to the BYPASS and SOURCE pins.
Primary Loop Area
The area of the primary loop that connects the input filter
capacitor, transformer primary and PeakSwitch together should
be kept as small as possible.
Primary Clamp Circuit
A clamp is used to limit the peak voltage on the DRAIN pin
at turn off. This can be achieved by using an RCD clamp or a
Zener (~200 V) and diode clamp across the primary winding. In all cases to minimize EMI care should be taken to minimize
the circuit path from the clamp components to the transformer
and PeakSwitch.
PKS603-607
Maximize hatched copper
areas (
) for optimum
heatsinking
Safety Spacing
Y1Capacitor
Output
Rectifier
+
Input Filter Capacitor
HV
-
PRI
BIAS
S
S
PeakSwitch
D
PRI
EN/UV
BIAS
S
TOP VIEW
T
r
a
n
s
f
o
r
m
e
r
Output Filter
Capacitor
SEC
BP
S
CBP
Optocoupler
DC +
OUT
-
(a)
PI-4326-060706
Safety Spacing
Maximize hatched copper
areas (
) for optimum
heatsinking
Y1Capacitor
+
Input Filter Capacitor
HV
Output
Rectifier
-
PRI
D
NC
PRI
BIAS
EN/UV
GND
TOP VIEW
BIAS
T
r
a
n
s
f
o
r
m
e
r
Output Filter
Capacitor
SEC
BP
Heat Sink
CBP
Optocoupler
(b)
-
DC +
OUT
PI-4327-031706
Figure 17. Recommended Layout for PeakSwitch in (a) P and (b) Y/F Packages.
11
Rev. I 10/06
PKS603-607
Thermal Considerations
For the P package, the four SOURCE pins are internally
connected to the IC lead frame and provide the main path to
remove heat from the device. Therefore, all the SOURCE pins
should be connected to a copper area underneath the PeakSwitch
to act not only as a single point ground, but also as a heatsink. As this area is connected to the quiet source node, it should be
maximized for good heatsinking. Similarly, for axial output
diodes, maximize the PCB area connected to the cathode.
Y-Capacitor
The placement of the Y-type cap should be directly from the
primary input filter capacitor positive terminal to the common/
return terminal of the transformer secondary. If a second
Y- type cap is required from primary to secondary return, connect
the primary side directly to the negative terminal of the input
capacitor. Such a placement will route high magnitude common
mode surge currents away from the PeakSwitch device. Note
– if an input π (C, L, C) EMI filter is used, then the inductor in
the filter should be placed between the negative terminals on
the input filter capacitors.
Optocoupler
Place the optocoupler physically close to the PeakSwitch to
minimize the primary side trace lengths. Keep the high current
high voltage drain and clamp traces away from the optocoupler
to prevent noise pick up.
Output Diode
For best performance, the area of the loop connecting the
secondary winding, the output diode and the output filter
capacitor should be minimized. In addition, sufficient copper
area should be provided at the anode and cathode terminal
of the diode for heatsinking. A larger area is preferred at the
quite cathode terminal. A large anode area can increase high
frequency radiated EMI.
Quick Design Checklist
As with any power supply design, all PeakSwitch designs
should be verified on the bench to make sure that component
specifications are not exceeded under worst case conditions. The
following minimum set of tests is strongly recommended:
1. Maximum drain voltage – Verify that the VDS does not exceed
650 V at highest input voltage and peak (overload) output
power. The 50 V margin to the 700 V BVDSS specification
allows margin for design variation.
2. Maximum drain currents – Verify the simultaneous drain
voltage and current levels are within the curve provided in
Figure 29 under worst case conditions. Typically this occurs
at start up (and during an output short circuit), highest input
line voltage and maximum ambient temperature. When
making this measurement using a current probe, to monitor
the drain current, ensure the results are corrected for the
10-20 ns current probe delay.
3. Maximum drain current – At maximum ambient temperature,
maximum input voltage and peak output (overload) power,
verify drain current waveforms show no signs of transformer
saturation. If the transformer shows signs of saturation,
it should be redesigned with a lower flux density, or a
higher quality core material should be used. To prevent
false triggering of the current limit, verify the leading
edge current spike event is below IINIT(MIN) at the end of the
tLEB(MIN). Under all conditions, the maximum drain current
should be below the absolute maximum limit specified in
the Absolute Maximum Ratings section.
4. Thermal Check – At specified maximum output power,
minimum input voltage and maximum ambient temperature,
verify that the temperature specifications are not exceeded for
PeakSwitch, transformer, output diode and output capacitors. Enough thermal margin should be allowed for part-to-part
variation of the RDS(ON) of PeakSwitch as specified in the
data sheet. Under low line, maximum power, a maximum
PeakSwitch SOURCE pin or tab temperature of 110 °C is
recommended to allow for these variations.
Design Tools
Up-to-date information on design tools can be found at the
Power Integrations web site: www.powerint.com.
12
Rev. I 10/06
PKS603-607
ABSOLUTE MAXIMUM RATINGS(1,4)
DRAIN Voltage ................................................-0.3 V to 700 V
DRAIN Peak Current: .............................. 2 × ILIMIT (Typical)(5)
EN/UV Voltage ....................................................-0.3 V to 9 V
EN/UV Current ............................................................ 100 mA
BYPASS Voltage ..................................................-0.3 V to 9 V
Storage Temperature ......................................-65 °C to 150 °C
Operating Junction Temperature(2) .................-40 °C to 150 °C
Lead Temperature(3)........................................................ 260 °C
Notes:
1. All voltages referenced to SOURCE, TA = 25 °C.
2. Normally limited by internal circuitry.
3. 1/16 in. from case for 5 seconds.
4. Maximum ratings specified may be applied one at a time, without causing permanent damage to the product. Exposure to Absolute Maximum Rating conditions for extended periods of time may affect product reliability.
5. Peak DRAIN current is allowed while the DRAIN voltage is simultaneously less than 400 V. See also Figure 29.
THERMAL IMPEDANCE
Thermal Impedance: Y/F Package:
(qJA)(1) ........................................80 °C/W
(qJC)(2) ..........................................2 °C/W
P Package:
(qJA) .....................70 °C/W(3); 60 °C/W(4)
(qJC)(5) ..................................... 10 °C/W(5)
Notes:
1. Free standing with no heatsink.
2. Measured at the back surface of tab.
3. Soldered to 0.36 sq. in. (232 mm2), 2 oz. (610 g/m2) copper clad.
4. Soldered to 1 sq. in. (645 mm2), 2 oz. (610 g/m2) copper clad.
5. Measured on the SOURCE pin close to plastic interface.
Conditions
Parameter
Symbol
SOURCE = 0 V; TJ = -40 to 125 °C
See Figure 18
(Unless Otherwise Specified)
Min
Typ
Max
250
277
304
Units
CONTROL FUNCTIONS
Output Frequency
fOSC
Maximum Duty
Cycle
DCMAX
EN/UV Pin Turn
Off Threshold
Current
IDIS
EN/UV Pin
Voltage
VEN
IS1
DRAIN Supply
Current
BYPASS Pin
Charge Current
IS2
Average
TJ = 25 °C
See Figure 4
Peak-Peak Jitter
S1 Open
16
kHz
62
65
68
%
-350
-240
-200
mA
IEN/UV = -125 mA
0.4
1.0
1.5
IEN/UV = 25 mA
1.3
2.0
2.7
VEN/UV = 0 V
350
475
600
PKS603
460
570
690
PKS604
600
725
870
PKS605
700
875
1050
PKS606
950
1175
1400
PKS607
1160
1430
1700
EN/UV Open
(MOSFET
Switching)
See Note A, B
ICH1
VBP = 0 V,
TJ = 25 °C
See Note C
PKS603-604
-7.5
-5.0
-2.5
PKS605-607
-10.0
-6.6
-3.2
ICH2
VBP = 4 V,
TJ = 25 °C
See Note C
PKS603-604
-4.5
-3.0
-1.5
PKS605-607
-6.5
-4.5
-2.5
V
mA
mA
13
Rev. I 10/06
PKS603-607
Conditions
Parameter
Symbol
SOURCE = 0 V; TJ = -40 to 125 °C
See Figure 18
(Unless Otherwise Specified)
CONTROL FUNCTIONS (cont.)
BYPASS Pin Shunt V
BP(SH)
Regulator Voltage
BYPASS Pin
VBP
Voltage
BYPASS Pin
VBPH
Voltage Hysteresis
EN/UV Pin Line
ILUV
Under-Voltage
Threshold
CIRCUIT PROTECTION
Current Limit
Power Coefficient
14
Rev. I 10/06
ILIMIT
I2f
See Note D
TJ = 25 °C
Min
Typ
Max
Units
6.0
6.3
6.7
V
5.5
5.8
6.15
V
0.8
1.0
1.3
V
22.5
25
27.5
mA
PKS603 P
TJ = 25 °C
di/dt = 200 mA/ms
See Note E
0.75
0.81
0.87
PKS604 P/Y/F
TJ = 25 °C
di/dt = 290 mA/ms
See Note E
1.35
1.45
1.55
PKS605 P
TJ = 25 °C
di/dt = 290 mA/ms
See Note E
1.35
1.45
1.55
PKS605 Y/F
TJ = 25 °C
di/dt = 325 mA/ms
See Note E
1.76
1.89
2.02
PKS606 P
TJ = 25 °C
di/dt = 255 mA/ms
See Note E
1.40
1.51
1.62
PKS606 Y/F
TJ = 25 °C
di/dt = 660 mA/ms
See Note E
2.60
2.80
3.00
PKS607 Y/F
TJ = 25 °C
di/dt = 800 mA/ms
2.79
3.00
3.21
PKS603 P
TJ = 25 °C
di/dt = 200 mA/ms
164
182
204
PKS604 P/Y/F
TJ = 25 °C
di/dt = 290 mA/ms
524
582
652
PKS605 P
TJ = 25 °C
di/dt = 290 mA/ms
524
582
652
PKS605 Y/F
TJ = 25 °C
di/dt = 325 mA/ms
890
989
1108
PKS606 P
TJ = 25 °C
di/dt = 255 mA/ms
569
632
708
PKS606 Y/F
TJ = 25 °C
di/dt = 660 mA/ms
1955
2172
2433
PKS607 Y/F
TJ = 25 °C
di/dt = 800 mA/ms
2242
2493
2793
A
A2kHz
PKS603-607
Conditions
Parameter
Symbol
SOURCE = 0 V; TJ = -40 to 125 °C
See Figure 18
(Unless Otherwise Specified)
Min
Typ
Max
Units
CIRCUIT PROTECTION (cont.)
Initial Current Limit
IINIT
See Figure 21
See Note F
0.75 ×
ILIMIT(Min)
Leading Edge
Blanking Time
tLEB
TJ = 25 °C
See Note F
170
Current Limit
Delay
tILD
TJ = 25 °C
See Notes F, G
Thermal Shutdown
Temperature
135
Thermal Shutdown
Hysteresis
mA
215
ns
150
ns
142
150
75
°C
°C
OUTPUT
PKS603
ID = 81 mA
PKS604
ID = 150 mA
ON-State
Resistance
RDS(ON)
PKS605
ID = 200 mA
PKS606
ID = 300 mA
PKS607
ID = 300 mA
OFF-State Drain
Leakage Current
IDSS1
IDSS2
Breakdown
Voltage
Drain Supply
Voltage
Output EN/UV
Delay
Output Disable
Setup Time
BVDSS
tEN/UV
tDST
TJ = 25 °C
7.8
9.0
TJ = 100 °C
11.7
13.5
TJ = 25 °C
5.2
6.0
TJ = 100 °C
7.8
9.0
TJ = 25 °C
3.9
4.5
TJ = 100 °C
5.8
6.7
TJ = 25 °C
2.6
3.0
TJ = 100 °C
3.9
4.5
TJ = 25 °C
2.0
2.3
TJ = 100 °C
3.0
3.5
VBP = 6.2 V
VEN/UV = 0 V
VDS = 560 V
TJ = 125 °C
See Note H
VBP = 6.2 V
VEN/UV = 0 V
200
mA
VDS = 375 V
TJ = 50 °C
See Note H
VBP = 6.2 V, VEN/UV = 0 V,
See Note I, TJ = 25 °C
W
15
700
V
50
V
See Figure 20
5
0.5
ms
ms
15
Rev. I 10/06
PKS603-607
Conditions
Parameter
OUTPUT (cont.)
Auto-Restart
ON Time
Auto-Restart
OFF Time
Symbol
SOURCE = 0 V; TJ = -40 to 125 °C
See Figure 18
(Unless Otherwise Specified)
Min
Typ
Max
Units
tAR
TJ = 25 °C
See Note J
30
ms
tAROFF
See Note K
5
s
NOTES:
A. Total current consumption is the sum of IS1 and IDSS when EN/UV pin is shorted to ground (MOSFET not
switching) and the sum of IS2 and IDSS when EN/UV pin is open (MOSFET switching).
B. Since the output MOSFET is switching, it is difficult to isolate the switching current from the supply current at the
DRAIN. An alternative is to measure the BYPASS pin current at 6.1 V.
C. See Typical Performance Characteristics section for BYPASS pin startup charging waveform.
D. BYPASS pin is externally supplied (bias winding).
E. For current limit at other di/dt values, refer to Figure 25.
F. This parameter is derived from characterization.
G. This parameter is derived from the change in current limit measured at 1X and 4X of the di/dt shown in the ILIMIT specification.
H. IDSS1 is the worst case OFF state leakage specification at 80% of BVDSS and maximum operating junction temperature. IDSS2 is a typical specification under worst case application conditions (rectified 265 VAC) for no-load
consumption calculations.
I. Breakdown voltage may be checked against minimum BVDSS specification by ramping the DRAIN pin voltage up
to but not exceeding minimum BVDSS.
J. Auto-restart on time has the same temperature characteristics as the oscillator (inversely proportional to frequency). Auto-restart on time is extended during startup and certain fault conditions because the controller
reduces its oscillator clock frequency to prevent excessive drain currents. If excessive drain currents are still
occuring half way through the auto-restart on time, output MOSFET switching is disabled for the remainder of that
auto-restart on time episode (if the line is not sensed) or the supply latches off (if the line is sensed and adequate
line voltage is present).
K. Only applicable if no UV resistor is present at the EN/UV pin. 5 s applies only if the preceding switching autorestart event did not result in EN/UV pin going low. In that event, the first auto-restart off-time is 150 ms.
16
Rev. I 10/06
PKS603-607
470 W
5W
S2
470 W
S
D
S1
S
4 MW
S EN/UV
BP
50 V
10 V
S
150 V
0.33 µF
NOTE: This test circuit is not applicable for current limit or output characteristic measurements.
PI-4317-030606
Figure 18. PeakSwitch General Test Circuit.
DCMAX
(internal signal)
tP
EN/UV
tEN/UV
VDRAIN
tP =
1
fOSC
PI-2364-012699
Figure 19. Duty Cycle Measurement.
tLEB (Blanking Time)
PI-4328-030806
Figure 20. Output Enable Timing.
0.8
IINIT(MIN)
ILIMIT(MIN) @ 100 °C
Figure 21. Current Limit Envelope.
17
Rev. I 10/06
PKS603-607
Typical Performance Characteristics
1.0
25
50
PI-4295-020806
1.2
0.4
0.2
1
0.8
0.6
0.4
0.2
0
-50
-25
0
25
50
75
100 125
Junction Temperature (°C)
Figure 23. Frequency vs. Temperature.
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
50
100
150
PI-4307-091206
1.2
1.0
0.8
Scaling Factors:
PKS603 1.0
PKS604 1.5
PKS605 2.0
PKS606 3.0
PKS607 4.0
0.6
0.4
0.2
TJ = 25 °C
TJ = 100 °C
0
2
4
6
8 10 12 14 16 18 20
Drain Voltage (V)
Figure 26. Output Characteristic.
1
2
3
4
Normalized di/dt
Figure 25. Current Limit vs. di/dt.
1000
PI-4308-091206
0
Junction Temperature (°C)
Figure 24. Standard Current Limit vs. Temperature.
0
-50
Drain Capacitance (pF)
Standard Current Limit
(Normalized to 25 °C)
0.6
75 100 125 150
Junction Temperature (°C)
Figure 22. Breakdown vs. Temperature.
Drain Current (A)
0.8
PI-4297-020806
0
Normalized Current Limit
-50 -25
18
1.0
0
0.9
Rev. I 10/06
PI-4294-022806
1.2
Output Frequency
(Normalized to 25 °C)
PI-2213-012301
Breakdown Voltage
(Normalized to 25 °C)
1.1
100
Scaling Factors:
PKS603 1.0
PKS604 1.5
PKS605 2.0
PKS606 3.0
PKS607 4.0
10
1
0
100
200
300
400
500
600
Drain Voltage (V)
Figure 27. COSS vs. Drain Voltage.
PKS603-607
Typical Performance Characteristics (cont.)
0.8
0.6
0.4
0.2
0
-50
0
50
100
150
Junction Temperature (°C)
Figure 28. Under-Voltage Threshold vs. Temperature.
PI-4330-031606
1
2.5
Drain Current
(Normalized to Typical ILIMIT)
PI-4296-020806
Under-Voltage Theshold
(Normalized to 25 °C)
1.2
2
1.5
1
0.5
0
0
100 200 300 400 500 600 700 800
Drain Voltage (V)
Figure 29. Maximum Allowable Drain Current vs.
Drain Voltage.
19
Rev. I 10/06
PKS603-607
PART ORDERING INFORMATION
PeakSwitch Product Family
Series Number
Package Identifier
P
Plastic DIP-8C
Y
Plastic TO-220-7C
F
Plastic TO-262-7C
Lead Finish
PKS 604 P N N
Pure Matte Tin (Pb-Free)
TO-220-7C
.165 (4.19)
.185 (4.70)
.390 (9.91)
.420 (10.67)
.146 (3.71)
.156 (3.96)
.108 (2.74) REF
+
.045 (1.14)
.055 (1.40)
.234 (5.94)
.261 (6.63)
.570 (14.48)
REF.
.461 (11.71)
.495 (12.57)
7° TYP.
.860 (21.84)
.880 (22.35)
.670 (17.02)
REF.
.080 (2.03)
.120 (3.05)
.068 (1.73) MIN
.024 (.61)
.010 (.25) M
.034 (.86)
.050 (1.27) BSC
PIN 1
.150 (3.81) BSC
PIN 2 & 4
PIN 1 & 7
.040 (1.02)
.060 (1.52)
.040 (1.02)
.060 (1.52)
.012 (.30)
.024 (.61)
.190 (4.83)
.210 (5.33)
.050 (1.27)
.050 (1.27)
.050 (1.27)
.050 (1.27)
.180 (4.58)
.200 (5.08)
.100 (2.54)
PIN 7
PIN 1
.150 (3.81)
Y07C
.150 (3.81)
Notes:
1. Controlling dimensions are inches. Millimeter
dimensions are shown in parentheses.
2. Pin numbers start with Pin 1, and continue from left
to right when viewed from the front.
3. Dimensions do not include mold flash or other
protrusions. Mold flash or protrusions shall not
exceed .006 (.15mm) on any side.
4. Minimum metal to metal spacing at the package
body for omitted pin locations is .068 in. (1.73 mm).
5. Position of terminals to be measured at a location
.25 (6.35) below the package body.
6. All terminals are solder plated.
MOUNTING HOLE PATTERN
PI-2644-122004
20
Rev. I 10/06
PKS603-607
DIP-8C
-E-
⊕D S
.004 (.10)
.240 (6.10)
.260 (6.60)
Pin 1
-D-
.367 (9.32)
.387 (9.83)
.057 (1.45)
.068 (1.73)
(NOTE 6)
.125 (3.18)
.145 (3.68)
-T-
Notes:
1. Package dimensions conform to JEDEC specification
MS-001-AB (Issue B 7/85) for standard dual-in-line (DIP)
package with .300 inch row spacing.
2. Controlling dimensions are inches. Millimeter sizes are
shown in parentheses.
3. Dimensions shown do not include mold flash or other
protrusions. Mold flash or protrusions shall not exceed
.006 (.15) on any side.
4. Pin locations start with Pin 1, and continue counter-clockwise to Pin 8 when viewed from the top. The notch and/or
dimple are aids in locating Pin 1. Pin 3 is omitted.
5. Minimum metal to metal spacing at the package body for
the omitted lead location is .137 inch (3.48 mm).
6. Lead width measured at package body.
7. Lead spacing measured with the leads constrained to be
perpendicular to plane T.
.015 (.38)
MINIMUM
SEATING
PLANE
.120 (3.05)
.140 (3.56)
.100 (2.54) BSC
.014 (.36)
.022 (.56)
.048 (1.22)
.053 (1.35)
⊕T E D
.137 (3.48)
MINIMUM
S .010 (.25) M
.008 (.20)
.015 (.38)
.300 (7.62) BSC
(NOTE 7)
.300 (7.62)
.390 (9.91)
P08C
PI-3933-100504
21
Rev. I 10/06
PKS603-607
TO-262-7C
.390 (9.91)
.420 (10.67)
.055 (1.40)
.066 (1.68)
.165 (4.17)
.185 (4.70)
.326 (8.28)
.336 (8.53)
7° TYP.
.795 (20.18)
REF.
.080 (2.03)
.120 (3.05)
.068 (1.73) MIN
.024 (.61)
.010 (.25) M
.034 (.86)
.050 (1.27) BSC
PIN 1
.150 (3.81) BSC
.045 (1.14)
.055 (1.40)
.495 (12.56)
REF.
.595 (15.10)
REF.
PIN 2 & 4
PIN 1 & 7
.040 (1.02)
.060 (1.52)
.040 (1.06)
.060 (1.52)
.012 (.30)
.024 (.61)
.190 (4.83)
.210 (5.33)
.050 (1.27)
.050 (1.27)
.050 (1.27)
.050 (1.27)
.180 (4.58)
.200 (5.08)
.100 (2.54)
PIN 7
PIN 1
.150 (3.81)
F07C
MOUNTING HOLE PATTERN
.150 (3.81)
Notes:
1. Controlling dimensions are inches. Millimeter
dimensions are shown in parentheses.
2. Pin numbers start with Pin 1, and continue
from left to right when viewed from the front.
3. Dimensions do not include mold flash or
other protrusions. Mold flash or protrusions
shall not exceed .006 (.15mm) on any side.
4. Minimum metal to metal spacing at the package body for omitted pin locations is .068
inch (1.73 mm).
5. Position of terminals to be measured at a
location .25 (6.35) below the package body.
6. All terminals are solder plated.
PI-2757-122004
22
Rev. I 10/06
PKS603-607
23
Rev. I 10/06
PKS603-607
Revision Notes
Date
F
1) Final Release Data Sheet.
H
Revised grounding in Figure 1 to match actual implementation.
6/06
I
Added PKS607.
8/06
G
Revised device symbol in Figures 1 and 15 to be consistent with other PI documentation (added second
ground connection). Revised layout of Figure 17 (PI-4326).
3/06
4/06
For the latest updates, visit our website: www.powerint.com
Power Integrations reserves the right to make changes to its products at any time to improve reliability or manufacturability. Power Integrations does not assume
any liability arising from the use of any device or circuit described herein. POWER INTEGRATIONS MAKES NO WARRANTY HEREIN AND SPECIFICALLY
DISCLAIMS ALL WARRANTIES INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE, AND NON-INFRINGEMENT OF THIRD PARTY RIGHTS.
PATENT INFORMATION
The products and applications illustrated herein (including transformer construction and circuits external to the products) may be covered by one or more U.S. and foreign patents, or potentially by pending U.S. and foreign patent applications assigned to Power Integrations. A complete list of Power Integrations’ patents
may be found at www.powerint.com. Power Integrations grants its customers a license under certain patent rights as set forth at http://www.powerint.com/ip.htm.
LIFE SUPPORT POLICY
POWER INTEGRATIONS’ PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS
WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF POWER INTEGRATIONS. As used herein:
1. A Life support device or system is one which, (i) is intended for surgical implant into the body, or (ii) supports or sustains life, and (iii) whose failure to perform,
when properly used in accordance with instructions for use, can be reasonably expected to result in significant injury or death to the user.
2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
The PI logo, TOPSwitch, TinySwitch, LinkSwitch, DPA-Switch, PeakSwitch, Clampless, EcoSmart, E-Shield, Filterfuse, StackFET, PI Expert and PI FACTS are trademarks of Power Integrations, Inc. Other trademarks are property of their respective companies. ©Copyright 2006, Power Integrations, Inc.
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24
Rev. I 10/06
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