Fairchild FAN5607 User manual

FAN5607 Ev rd User Manualaluation Boa
July 2005
FAN5607 Evaluation Board User Manual
2.4 to 5.5V Input Range
Up to 120mA Output Current (4x30mA)
Adaptive Vout Adjustment to the Highest
Diode Voltage
External Resistor to Set Maximum LED
Current
Enable Input Can have PWM LED Brightness
Control
Short Circuit Protection, Shutdown Mode and
Soft Start
1MHz Operating Frequency
Up to 93% Efficiency
Small 16-lead 4x4mm MLP Package
Figure 1: FAN5607 HMPX
Description:
The FAN5607 Evaluation Board is a compact circuit including the FAN5607 HMPX in a 4x4 MLP
package and two 4.7uF capacitors which can provide stable input/output current for up to four of
Fairchild’s super bright white LEDs. Two 1uF bucket capacitors maintain constant current through the
LEDs in different pump regulator modes. The FAN5607 demo board, a completely assembled and tested
surface mount board, provides easy probe access points to all inputs and outputs so that electrical
characteristics and waveforms can be easily measured.
Where To Begin:
1: Connect Battery (2.4 to 5.5V) and Gnd (0V).
2: Jumper JP5 presets the LED current to 20mA. Use the adjustable resistor POT1 to decrease
the current. (Note: It is not advised to increase current beyond 20mA due to LED limitations)
3: Each LED current can be measured by removing jumpers JP1 through JP4 respectfully and
applying a current meter. Observe that the LED current is constant regardless of Battery input
voltage and that current is not affected by varying numbers of LEDs. Observe that the supply
current changes in steps when the battery voltage reaches the threshold of mode changes.
(Note: Replacing the provided LEDs with other types can affect the input voltage threshold
values where transition modes occur)
4: Adding resistor R1 by removing jumper JP6 reduces battery voltage ripple.
5: To verify supply current in “ON” and “OFF” modes, observe that in shutdown mode, supply
current will drop below 1uA at Battery input.
6: To verify PWM dimming, remove ENABLE jumper and apply a PWM signal of 100Hz to ON
(pin 2). Observe that the average LED current is directly proportional to the duty cycle.
7: To measure clock frequency, connect scope probe to bucket capacitors C1+, C1-, C2+
and C2-
8: Observe that the circuit is protected from open load conditions by verifying the output
voltage Vout < 6V.
©2005 Fairchild Semiconductor Corporation 1 www.fairchildsemi.com
FAN5607 Version 1.0

FAN5607 Evaluation Board User Manual
Figure 2: Schematic Diagram
Figure 3: PCB Layout
Figure 4: Start-Up Waveform
©2005 Fairchild Semiconductor Corporation 2 www.fairchildsemi.com
FAN5607 Version 1.0

Table 1: FAN5607 List of Materials
FAN5607 Evaluation Board User Manual
Description Qty Ref. Vendor Part Number
Capacitor 1uF, 10%, 10VDC,
X7R, 0805 2C1,C2 Kemet Panasonic
Murata
C0805C105K8RACTU
ECJ-2YB1A105K
GRM21BR71A105K
Capacitor 4.7uF, 20%,
6.3VDC, X5R, 0805 2 C3,C4 Panasonic Taiyo Yuden
TDK
ECJ-2FBOJ475M
JMK212BJ475MG
C2012X5R0J475M
Capacitor 10uF, 10%, 6.3V,
X5R, 1206 1 C5 Rubycon Panasonic 16MBZ1500M10x20 ECJ-3YB0J106K
LED Super Bright QTLP670C-
IW 4 LED1 to 4 Fairchild QTLP620C-IW
Hardware Connector Header
.1 SINGLE STR 36POS 29 JP,TP Digi-Key S1011-36-ND
IC System Regulator, MLP16
4x4, FSID: FAN5607 HMPX 1 U1 Fairchild FAN5607 HMPX
Resistor 125 Kohm, 1%, 0805 1 R2 Any
Potentiometer 100K 1 P1 Any
Resistor 10K to 1MOhm 1 R3 Any
Table 2: Ordering Information
Product Number Package Type Order Code
FAN5607 16-Lead 4x4mm MLP FAN5607HMPX
©2005 Fairchild Semiconductor Corporation 3 www.fairchildsemi.com
FAN5607 Version 1.0

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© 2005 Fairchild Semiconductor
www.fairchildsemi.com