LinkSwitch-HP
internal circuit decodes the current limit based on resistor
loaded on the PROGRAM pin. Please see Table 4. It can also
be used for optionally extending shutdown delay time by
changing the capacitance on the pin. See Figure 6.
Pin Functional Description
BYPASS (BP) Pin:
An external bypass capacitor is connected to this pin for the
internally generated 5.75 V supply. Based on the connected
capacitance determined at start-up, it will provide either
auto-restart or latching shutdown option dependant on the fault
condition. Please see Table 3.
SOURCE (S) Pin:
This pin is the power MOSFET source connection. It is also the
ground reference for the BYPASS, FEEDBACK, PROGRAM and
COMPENSATION pins.
COMPENSATION (CP) Pin:
Functional Description
This pin is the output of transconductance amplifier. An RC
compensation network on this pin provides control loop
compensation.
A LinkSwitch-HP device monolithically integrates a controller
and high-voltage power MOSFET into one package. It has a
newly developed analogue control scheme, which enables
continuous conduction mode (CCM), primary side regulated
(PSR) power supplies up to 90 W without the efficiency
limitation of DCM or audible noise. It uses an enhanced peak
current mode PWM control scheme with multi-mode operation.
The multi-mode control engine uses the error amplifier output
signal voltage at the COMPENSATION pin to set the operating
peak current and switching frequency to maintain the output
voltage in regulation as shown in Figure 5. For COMPENSATION
pin voltages lower than VC(MCM) (typ. 1.25 V) the device enters
multi-cycle modulation (MCM) with a fixed peak current of 25%
of the programmed current limit. Several innovative improvements
have been added to the peak current mode control to allow
primary side regulated CCM operation with no instability. The
device meets less than 30 mW input power with no-load at
high-line (LNK67xx families).
DRAIN (D) Pin:
This pin is the high-voltage power MOSFET drain connection. It
also provides internal operating current for start-up until output
is in regulation.
FEEDBACK (FB) Pin:
The FEEDBACK pin is used to sense output and input voltage
by sensing the auxiliary winding voltage. During MOSFET
on-time, the current out of the FEEDBACK pin is sensed to
detect the line voltage. During the secondary rectifier
conduction time, the feedback voltage is proportional to the
output voltage via the turns ratio between the bias and
secondary windings.
PROGRAM (PD) Pin:
This MULTI-FUNCTIONAL pin sets device current limit and
optional shutdown delay time extension. During start-up, the
It also offers extensive built-in features:
• External current limit selection.
E Package
(eSIP-7C)
• Optional programmable shutdown delay time extension.
• Optional remote On/Off.
• Optional fast AC reset.
Exposed Pad
(Hidden)
Internally
Connected to
SOURCE Pin
• Primary-side sensed output overvoltage protection (OVP) .
• Lost regulation protection during output overload or
short-circuit (auto-restart).
• Internal current limit over line compensation for constant
overload power over line.
• High-voltage bus overvoltage sense (line OV) for extended line
surge withstand.
• High-voltage bus undervoltage sense (line UV) for brown-in/
out protection.
Exposed Pad Internally
Connected to SOURCE Pin
V Package
(eDIP-12B)
1 PD
2 FB
3 CP
4 BP
S 12
S 11
S 10
S 9
1 2 3 4 5
P F CB S
DB P P
7
D
• Accurate over-temperature protection (OTP).
• Output OVP/OCP/OTP shutdown type selection (hysteretic/
latching).
S 8
S 7
6 D
• Optional external latching shutdown input (current threshold)
• Cycle-by-cycle current limit control.
Exposed Pad (On Bottom)
Internally Connected to
SOURCE Pin
K Package
(eSOP-12B)
Regulator/Shunt Voltage Clamp
PD 1
12 S
11 S
10 S
9 S
The internal 5.75 V regulator charges the bypass capacitor
connected to the BYPASS pin to 5.75 V by drawing a current
from DRAIN whenever the power MOSFET is off. When the
power MOSFET is on, the device operates from the energy
stored in the bypass capacitor. In addition, there is a shunt
regulator clamping the bypass at 6.4 V when supply current is
provided by a bias winding through an external resistor. This
makes the device insensitive to bias winding voltage variations.
FB 2
CP 3
BP 4
8 S
D 6
7 S
PI-6564-081412
Figure 4. Pin Configuration.
3
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