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NXP Semiconductors
V sense(fb)max
SSL1750
SMPS control IC for LED drivers
0.52 V
PFC burst mode
PFC on
flyback
frequency
reduction
flyback
discontinuous
FBSENSE peak voltage
0.13 V
flyback
cycle skip
mode
or QR
1.4 V 1.5 V
2.0 V
V FBCTRL
014aaa028
Fig 11. Frequency control of ?yback part
The driver output is latched in the logic, preventing multiple switch-on.
7.3.4 Demagnetization (pin FBAUX)
The system is always in quasi-resonant or discontinuous conduction mode. The internal
oscillator does not start a new primary stroke until the previous secondary stroke has
ended.
Demagnetization features a cycle-by-cycle output short circuit protection by immediately
lowering the frequency (longer off-time), thereby reducing the power level.
Demagnetization recognition is suppressed during the ?rst t sup(xfmr_ring) time (2 μ s typ).
This suppression may be necessary at low output voltages and at start-up and in
applications where the transformer has a large leakage inductance.
If pin FBAUX is open-circuit or not connected, a fault condition is assumed and the
converter stops operating immediately. Operation restarts as soon as the fault condition is
removed.
7.3.5 Flyback control / time-out (pin FBCTRL)
Pin FBCTRL is connected to an internal voltage source of 3.5 V via an internal resistor
(typical resistance is 3 k ? ). As soon as the voltage on this pin is above 2.5 V (typ), this
connection is disabled. Above 2.5 V the pin is biased with a small current. When the
voltage on this pin rises above 4.5 V (typ), a fault is assumed and switching is inhibited.
When a small capacitor is connected to this pin, a time-out function can be created to
protect against an open control loop situation (see Figure 12 and Figure 13 ). The time-out
function can be disabled by connecting a resistor (100 k ? ) to ground on pin FBCTRL.
If the pin is shorted to ground, switching of the ?yback controller is inhibited.
In normal operating conditions, when the converter is regulating the output, the voltage on
pin FBCTRL is between 1.4 V and 2.0 V (typical values) from minimum to maximum
output power.
SSL1750_1
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 15 September 2008
16 of 29
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