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SSL4120T/1,518

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P47
SSL4120T All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Objective data sheet Rev. 1 — 21 June 2012 10 of 47
NXP Semiconductors
SSL4120T
Resonant power supply control IC with PFC
7.4 Enable input (pin SSHBC/EN)
The power supply application can be completely disabled by pulling pin SSHBC/EN LOW.
Figure 4
illustrates the internal functionality. When a voltage is present on pin SUPHV or
on pin SUPIC, a current I
pu(EN)
(typ. 42 μA) flows out of SSHBC/EN. If the pin is not
pulled-down, this current will lift the voltage up to V
pu(EN)
(typ. 3 V). Since this voltage is
above both V
en(PFC)(EN)
(typ. 1.2 V) and V
en(IC)(EN)
(typ. 2.2 V), the IC will be completely
enabled.
The IC can be completely disabled by pulling the voltage on SSHBC/EN down below both
V
en(PFC)(EN)
and V
en(IC)(EN)
via an opto-coupler driven from the secondary side of the HBC
transformer (see Figure 4
). The PFC controller will stop switching immediately, but the
HBC controller will continue switching until the low-side stroke is active. It is also possible
to control the voltage on SSHBC/EN from another circuit on the secondary side via a
diode. The external pull-down current must be larger than the internal soft start charge
current I
ss(hf)(SSHBC)
.
If the voltage on SSHBC/EN is pulled down below V
en(IC)(EN)
, but not below V
en(PFC)(EN)
,
only the HBC will be disabled. This feature can be useful when another power converter is
connected to the boost voltage of the PFC.
The low-side power switch of the HBC will be on when the HBC is disabled via the
SSHBC/EN pin.
Boost charge Boost voltage is built up by operational PFC.
Operational supply Output voltage is generated. Both PFC and HBC controllers are fully operational.
Restart Activated when a protection function is triggered. Restart timer is activated. During this time,
PFC and HBC controllers are disabled and C
SUPREG
is not charged. C
SUPIC
is charged.
Protection shut-down Activated when a protection function is triggered. IC is not operational. PFC and HBC controllers
are disabled and C
SUPIC
and C
SUPREG
are not charged.
Table 3. Operating states …continued
State Description
SSL4120T All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Objective data sheet Rev. 1 — 21 June 2012 11 of 47
NXP Semiconductors
SSL4120T
Resonant power supply control IC with PFC
7.5 IC protection
7.5.1 IC restart and shut-down
In addition to the protection functions that influence the operation of the PFC and HBC
controllers, a number of protection functions are provided that disable both controllers.
See the protection overview in Section 7.9
for details on which protections trigger a restart
or a protection shut-down.
• Restart
When the SSL4120T enters the Restart state, the PFC and HBC controllers are
switched off. After a period defined by the Restart timer, the IC automatically restarts
following the normal start-up cycle.
• Protection shut-down
When the SSL4120T enters the Protection shut-down state, the PFC and HBC
controllers are switched off. The Protection shut-down state is latched, so the IC will
not start up again automatically. It can be restarted by resetting the Protection
shut-down state in one of the following ways:
– by lowering V
SUPIC
and V
SUPHV
below their respective reset levels, V
rst(SUPIC)
and
V
rst(SUPHV)
– via a fast shut-down reset (see Section 7.5.3).
– via the enable pin (see Section 7.4
)
• Thermal hold
In the Thermal hold state, the PFC and HBC controllers are switched off. The Thermal
hold state remains active until the IC junction temperature drops to about 10 °C below
T
otp
(see Section 7.5.6).
Fig 4. Circuit configuration around pin SSHBC/EN
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SSL4120T All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Objective data sheet Rev. 1 — 21 June 2012 12 of 47
NXP Semiconductors
SSL4120T
Resonant power supply control IC with PFC
7.5.2 Protection and restart timer
The SSL4120T contains a programmable timer which can be used for timing several
protection functions. The timer can be used in two ways - as a protection timer and as a
restart timer. The timing of the timers can be set independently via an external resistor
R
prot
and capacitor C
prot
connected to pin RCPROT.
7.5.2.1 Protection timer
Certain error conditions can be allowed to persist for a period of time before protective
action needs to be taken. The protection timer defines the protection period - how long the
error is allowed to persist before the protection function is triggered. The protection
functions that use the protection timer can be found in the protection overview in
Section 7.9
.
Figure 5 shows the operation of the protection timer. When an error condition occurs, a
fixed current I
ch(slow)(RCPROT)
(typ. 100 μA) flows out of the RCPROT pin and charges
C
prot
. R
prot
will cause the voltage to rise exponentially. The protection time has elapsed
when the voltage on RCPROT reaches the upper switching level V
u(RCPROT)
(typ. 4 V). At
this instant, the appropriate protective action is taken and C
prot
is discharged.
If the error condition is removed before the voltage on RCPROT reaches V
u(RCPROT)
, C
prot
is discharged via R
prot
and no action is taken.
The voltage on RCPROT may be raised above V
u(RCPROT)
by an external circuit to force a
restart.
7.5.2.2 Restart timer
Certain error conditions require the IC to be disabled for a period of time, particularly when
the error condition can cause components to overheat. In such cases, the IC should be
disabled to allow the power supply to cool down, before restarting automatically. The
restart time is determined by the restart timer. The restart timer is active in the Restart
state. The protection functions that trigger a restart can be found in the protection
overview in Section 7.9.
Fig 5. Operation of the protection timer
passed
0
0
none
present
short
error
long
error
repetative
error
V
u(RCPROT)
I
ch(slow)(RCPROT)
I
RCPROT
Error
V
RCPROT
t
Protection time
014aaa853
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SSL4120T/1,518

Mfr. #:
Buy SSL4120T/1,518
Manufacturer:
NXP Semiconductors
Description:
Display Drivers & Controllers Resonant powersupply controller with PFC
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New from this manufacturer.
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