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STCS2ASPR
2A MAX CONSTANT CURRENT LED DRIVER
STCS2A2 A max constant current LED driver
Features Up to 40 V input voltage Less than 0.5 V voltage overhead Up to 2 A output current PWM dimming pin Shutdown pin LED disconnection diagnostic Slope control with external cap
Applications LED constant current supplying for varying
input voltages Low voltage lighting Small appliances LED lighting Car LED lights
DescriptionThe STCS2A is a BiCMOS constant current
source designed to provide a precise constant
current starting from a varying input voltage
source. The main target is to replace discrete
components
solution for driving LEDs in low voltage
applications such as 5 V, 12 V or 24 V giving
benefits in terms of precision, integration and
reliability.
The current is set with external resistor up to 2 A
with a ± 10 % precision; a dedicated pin allows
implementing PWM dimming. An external
capacitor allows setting the slope for the current
rise from tens of microseconds to tens of
milliseconds allowing reduction of EMI.
An open-drain pin output provides information on
load disconnection condition.
Table 1. Device summary
Contents STCS2A
Contents Application diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Detail description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107.1 Current setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7.2 Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7.3 PWM dimming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7.4 Diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128.1 Reverse polarity protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
8.2 Thermal considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
STCS2A Application diagram
1 Application diagram
Figure 1. Typical application diagram for 2 A LED current
Pin configuration STCS2A
2 Pin configuration
Figure 2. Pin connections (top view)
Table 2. Pin description
STCS2A Maximum ratings
3 Maximum ratings
Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these conditions is not implied.
Table 3. Absolute maximum ratings TJ is calculated from the ambient temperature TA and the power dissipation PD according the following formula:
TJ = TA + (PD x RthJA). See Figure 16. for details of max power dissipation for ambient temperatures higher than 25 °C.
Table 4. Thermal data FR4 with using the recommended pad-layout FR4 with heat sink on board (6 cm2). FR4 with copper-filled through holes and external heat sink applied.
Electrical characteristics STCS2A
4 Electrical characteristics
Note: All devices 100 % production tested at TA = 25 °C. Limits over the operating temperature
range are guaranteed by design.
Table 5. Electrical characteristics (VCC = 12 V; IO = 100 mA; TJ = -40 °C to 125 °C; VDRAIN = 1 V;
CDRAIN = 1 µF; CBYP = 100 nF typical values are at TA = 25°C, unless otherwise specified)
STCS2A Timing
5 Timing
Figure 3. PWM and output current timing
Figure 4. Block diagram
Typical performance characteristics STCS2A Typical performance characteristics
Figure 5. IDRAIN vs VCC, TA = 25°C Figure 6. IDRAIN vs RSET
Figure 7. I DRAIN vs temperature Figure 8. V DROP (including VFB ) vs
temperature
Figure 9. ICC vs temperature Figure 10.ICC vs VCC
STCS2A Typical performance characteristics
Figure 11. Trise/Tfall vs CSLOPE Figure 12. Turn-on time
Figure 13. Dimming operation: Rise Figure 14. Dimming operation: Fall
