SSL5021BTS Datasheet PDF - NXP

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SSL5021BTS
NXP

Part Number SSL5021BTS
Description Compact low-ripple buck LED driver IC
Page 18 Pages


SSL5021BTS datasheet pdf
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SSL5021BTS
Compact low-ripple buck LED driver IC
Rev. 1 — 15 October 2014
Preliminary data sheet
1. General description
The SSL5021BTS is a highly integrated, high-precision, non-isolated MOSFET/bipolar
buck controller. It is intended to drive LED lamps in universal mains non-dimmable lighting
applications up to 25 W. The SSL5021BTS is designed for low-ripple applications.
The SSL5021BTS operates in Boundary Conduction Mode (BCM) with on-time regulation.
Operating in BCM provides a constant output current control with high accuracy. Adaptive
switching frequency gives freedom to choose the inductor, which enables the optimization
of inductor size, efficiency and EMI.
The SSL5021BTS starts up and operates in switching mode directly from an external
resistor without dV/dt supply or auxiliary supply. This feature simplifies the VCC supply. It
allows a low-cost off-the-shelf inductor to be used, providing flexibility in application
design.
The SSL5021BTS comes in a compact TSOP6 package.
The SSL5031BTS is suitable for high power factor/Low THD applications with a
high-temperature foldback function. The SSL5031CTS is best for high power
factor/low THD applications without a high-temperature foldback function.
2. Features and benefits
Driving LED strings from a rectified mains supply, low-ripple (< ±5 %)
Small electronic Bill of Materials (BOM) enabling a compact solution and a small,
single layer Printed-Circuit Board (PCB) footprint
Excellent line and load regulation and LED output current accuracy
Efficient BCM operation with:
No reverse recovery losses in freewheel diode
Zero Current Switching (ZCS) and valley switching for switch turn-on
Minimal inductance value and size required
High efficiency (up to 93 %)
Ultra low IC current during operation (< 150 A)
Many auto-recovery protections:
UnderVoltage LockOut (UVLO)
Cycle-by-cycle OverCurrent Protection (OCP)
Internal OverTemperature Protection (OTP)
Output OverVoltage Protection (OVP)
Output Short Protection (OSP)



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NXP Semiconductors
SSL5021BTS
Compact low-ripple buck LED driver IC
Thermal foldback protection via a single PTC or NTC resistor
Compatible with wall switches with built-in standby indicator lights (Hotaru switch)
IC lifetime meets and exceeds the required LED lamp lifetime
3. Applications
The SSL5021BTS is intended for low-cost, non-isolated LED lighting applications with
accurate fixed current output up to 25 W for single mains or universal mains voltage
(90 V (AC) to 277 V (AC)).
4. Quick reference data
Table 1.
Symbol
VCC
RDSon
Ii(SW)
Vi(SW)
Quick reference data
Parameter
Conditions
supply voltage
operating range
on-state resistance of internal switch
Tj = 25 C
Tj = 125 C
input current in pin SW duty cycle < 5 %
input voltage on pin
SW
current limited at
8.8 mA;
internal switch off
Min Typ Max Unit
[1] 9.5
-
16 V
- 0.75 -
- 1.20 -
2 -
+2
0.4 -
+22
A
V
[1] An internal clamp sets the supply voltage. The current into the VCC pin must not exceed the maximum IVCC
value (see Table 4).
5. Ordering information
Table 2. Ordering information
Type number
Package
Name
Description
SSL5021BTS
TSOP6
plastic surface-mounted package; 6 leads
Version
SOT457
SSL5021BTS
Preliminary data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 15 October 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
2 of 18



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NXP Semiconductors
6. Block diagram
SSL5021BTS
Compact low-ripple buck LED driver IC
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Fig 1. Block diagram
7. Pinning information
7.1 Pinning
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Fig 2. SSL5021BTS pin configuration (TSOP6)
SSL5021BTS
Preliminary data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 15 October 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
3 of 18



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NXP Semiconductors
SSL5021BTS
Compact low-ripple buck LED driver IC
7.2 Pin description
Table 3. Pin description
Symbol
Pin
ISNS
1
VCC
2
SW 3
DEMOVP
4
GND
COMP
5
6
Description
current sense input
supply voltage
internal switch drain
input from LED output for demagnetization timing, valley detection,
temperature foldback, and OVP
ground
loop compensation to provide a stable response
8. Functional description
8.1 Converter operation
The SSL5021BTS is a power MOSFET and bipolar compatible controller. The converter in
the SSL5021BTS is a source/emitter switch, Boundary Conduction Mode (BCM), on-time
controlled system. Figure 3 shows the application diagram for MOSFET. Figure 4 shows
the application diagram for bipolar.
The integrated switch is used to save IC supply current. It enables the use a single
external resistor as supply even in switching mode. This converter operates at the
boundary between Continuous Conduction Mode (CCM) and Discontinuous Conduction
Mode (DCM). Figure 5 shows the waveforms.
When the internal switch is switched on at t0, the inductor current IL builds up from zero in
proportional with VIN - VOUT during the switch on-time (t0 to t1). Energy is stored in the
inductor.
When the internal switch switches off at t1, IL drops proportionally to the value of VOUT.
The current flows through the freewheeling diode and the output capacitor (t2 to t3). When
IL reaches zero, after a short delay (t3 to t00), a new switching cycle starts.
SSL5021BTS
Preliminary data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 15 October 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
4 of 18



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