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STCS05DR
0.5A MAX CONSTANT CURRENT LED DRIVER
STCS050.5 A max constant current LED driver
Features Up to 40 V input voltage Less than 0.5 V voltage overhead Up to 0.5 A output current PWM dimming pin Shutdown pin LED disconnection diagnostic
Applications LED constant current supplying for varying
input voltages Low voltage lighting Small appliances LED lighting Car LED lights
DescriptionThe STCS05 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 0.5
A with a ± 10 % precision; a dedicated pin allows
implementing PWM dimming.
An open-drain pin output provides information on
load disconnection condition.
Table 1. Device summary
STCS05
Contents Application diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Detail description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97.1 Current setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7.2 Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7.3 PWM dimming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7.4 Diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108.1 Reverse polarity protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
8.2 Thermal considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
STCS05 Application diagram
Application diagram
Figure 1. Typical application diagram for 0.5 A LED current
Pin configuration STCS05
1 Pin configuration
Figure 2. Pin connections (top view)
Table 2. Pin description
STCS05 Maximum ratings
2 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 12 for details of max power dissipation for ambient temperatures higher than 25°C.
Table 4. Thermal data This value depends from thermal design of PCB on which the device is mounted.
Electrical characteristics STCS05
3 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)
STCS05 Timing
4 Timing
Figure 3. PWM and output current timing
Figure 4. Block diagram
Typical performance characteristics STCS05 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
