an30888b Panasonic Corporation of North America, an30888b Datasheet
an30888b
Related parts for an30888b
an30888b Summary of contents
Page 1
... DATA SHEET Part No. Package Code No. Publication date: May 2010 AN30888B ∗QFN016-P-0304B SDG00005AEB 1 ...
Page 2
... AN30888B Overview ………………………………………….………………………………………………………………… 3 Features … ...
Page 3
... AN30888B AN30888B High Brightness LED Driver IC Overview AN30888B is a Boost/Buck-Boost/Buck DCDC controller that drives an external power NMOS switch suitable for driving high brightness LED for LED lighting applications. Features Battery operation : Output current range : Current mode control architecture LED dimming function available by using PWM signal ...
Page 4
... AN30888B Application Circuit Example (Block Diagram) Boost Mode 1 VIN ENB UVLO 10 PWM Reference 2 VFB_SEL voltage Notes) This application circuit is an example. The operation of mass production set is not guaranteed. Perform enough evaluation and verification on the design of mass production set. Use external resistor with ±1% accuracy at CS pin. ...
Page 5
... AN30888B Application Circuit Example (Block Diagram) (continued) Buck-Boost Mode 1 VIN BGR ENB UVLO 10 PWM Reference 2 VFB_SEL voltage Notes) This application circuit is an example. The operation of mass production set is not guaranteed. Perform enough evaluation and verification on the design of mass production set. ...
Page 6
... AN30888B Application Circuit Example (Block Diagram) (continued) Buck Mode 1 VIN ENB UVLO 10 PWM Reference 2 VFB_SEL voltage Notes) This application circuit is an example. The operation of mass production set is not guaranteed. Perform enough evaluation and verification on the design of mass production set. ...
Page 7
... AN30888B Pin Descriptions Pin No. Pin name 1 VIN Power Supply 2 VFB_SEL 3 N. N.C. 6 OVP 7 GNDP Ground 8 N. Output 10 PWM 11 N.C. 12 ENB 13 N.C. 14 VREG Output 15 GND Ground 16 N.C. Type Power Supply of IC Input Feedback voltage select — — Input Current Sense — — Input Over Voltage Protection input pin for Boost mode ...
Page 8
... AN30888B Absolute Maximum Ratings Note) Absolute maximum ratings are limit values which do not result in damages to this IC, and IC operation is not guaranteed at these limit values. A No. Parameter 1 Supply voltage 2 GND pin current 3 Power dissipation 4 Operating ambient temperature 5 Storage temperature Notes The values under the condition not exceeding the above absolute maximum ratings and the power dissipation. ...
Page 9
... AN30888B Allowable Voltage Range Notes) Allowable current and voltage ranges are limit ranges which do not result in damages to this IC, and IC operation is not guaranteed within these limit ranges. Voltage values, unless otherwise specified, are with respect to GND voltage for VIN pin not apply external currents or voltages to any pin not specifically mentioned. ...
Page 10
... AN30888B Electrical Characteristics at V Note 25°C±2°C unless otherwise specified Parameter No. Circuit Current Consumption 1 Standby Current 2 Operating Quiescent Current ENABLE (ENB), VFB_SEL and PWM Control Function 3 ENB High Input Logic 4 ENB Low Input Logic 5 VFB_SEL High Input Logic ...
Page 11
... AN30888B Electrical Characteristics (Reference values for design Note) The characteristics listed below are reference values derived from the design of the IC and are not guaranteed by inspection problem does occur related to these characteristics, we will respond in good faith to user concerns. B No. Parameter ...
Page 12
... AN30888B Control Pin Mode Table Note) See parameters B No and 8 in the Electrical Characteristics for control voltage ranges. Pin No. Description 2 VFB_SEL ON/OFF 10 PWM ON/OFF 12 ENB ON/OFF Pin voltage Low High 202 mV Feedback voltage selection FB FB PWM OFF ...
Page 13
... AN30888B Electrical Characteristics Test Procedures C Parameter No. Circuit Current Consumption 1 Standby Current Operating Quiescent 2 Current ENABLE (ENB), VFB_SEL and PWM Control Function 3 ENB High Input Logic 4 ENB Low Input Logic VFB_SEL High Input 5 Logic VFB_SEL Low Input 6 Logic 7 PWM High input Logic ...
Page 14
... AN30888B Electrical Characteristics Test Procedures (continued) C Parameter No. 8 PWM Low input Logic Input Pin Current Consumption 9 Enable Pin Current Output Driver 10 SW High Output Logic 11 SW Low Output Logic Input Pin Pin Conditions No. No. 12 ENB = V IN PWM = 0.30 × REG 2 VFB_SEL = 3.65 V ...
Page 15
... AN30888B Electrical Characteristics Test Procedures (continued) C Parameter No. Under voltage Lock Out (UVLO) Under voltage protection 12 on value Under voltage protection 13 Hysteresis Input Pin Pin Conditions No. No. 12 ENB = PWM = Hi-Z 2 VFB_SEL = 3. OVP = Hi-Z 12 ENB = PWM = Hi-Z 2 VFB_SEL = 3. ...
Page 16
... AN30888B Technical Data I/O block circuit diagrams and pin function descriptions Note) The characteristics listed below are reference values derived from the design of the IC and are not guaranteed. Waveform Pin No. and voltage VREG VFB_SEL — ...
Page 17
... AN30888B Technical Data (continued) I/O block circuit diagrams and pin function descriptions (continued) Note) The characteristics listed below are reference values derived from the design of the IC and are not guaranteed. Waveform Pin No. and voltage VREG 14 OVP 1. GNDP 8 — ...
Page 18
... AN30888B Technical Data (continued) I/O block circuit diagrams and pin function descriptions (continued) Note) The characteristics listed below are reference values derived from the design of the IC and are not guaranteed. Waveform Pin No. and voltage ENB — VIN ...
Page 19
... Standby enable function AN30888B enters standby mode when ENB pin is pulled low. During standby, the IC draws a small current of value less than 10 μA from the power supply. This helps to achieve longer battery usage time. During Boost mode operation, although external MOSFET cannot be turned on at standby condition, there is still a DC current path between the input and the LEDs through the inductor and schottky diode ...
Page 20
... AN30888B − − − out ) N LEDs VIN * V F Technical Data (continued LEDs - - VF Vout − = VIN Functions and properties descriptions (continued) (3) Internal regulator An internal 3.65 V regulator is used as the power supply for internal core circuit of this IC. This regulated voltage, V will be provided when V REG will act ...
Page 21
... AN30888B Technical Data (continued) Functions and properties descriptions (continued) (5) Feedback voltage pin FB The V voltage is generated internally in the IC and output at CS pin. This voltage allows users to fix the input peak current the LED output current This voltage will change according to the setting at VFB_SEL pin. ...
Page 22
... AN30888B Technical Data (continued) Functions and properties descriptions (continued) (5) Feedback voltage pin (continued) FB BOOST MODE: VCS Voltage vs VIN 220.0 200.0 180.0 160.0 140.0 120.0 100.0 80.0 60.0 40.0 20.0 0 VIN(V) BUCK MODE: VCS Voltage vs VIN 220.0 200.0 180.0 160.0 140.0 120.0 100.0 80 ...
Page 23
... AN30888B Eq[ Technical Data (continued Functions and properties descriptions (continued) (6) Inductor selection Inductor value set by the required inductor ripple current desired. The general trend for lower inductor value is a smaller inductor physical size, but a larger input ripple current. Similarly, an increase in inductor value will decease input ripple current ...
Page 24
... AN30888B Eq[7] Technical Data (continued Functions and properties descriptions (continued) (7) Setting output LED current and choosing current sense resistor R The LED current in this IC can be set easily by selecting the appropriate R For Boost Mode and Buck-Boost mode : R resistor can be set in the following way : ...
Page 25
... AN30888B Technical Data (continued) Functions and properties descriptions (continued) (7) Setting output LED current and choosing current sense resistor R For Buck Mode : R resistor can be set in the following way : CS First is to calculate the peak current I current plus half of actual current ripple through the inductor. ...
Page 26
... AN30888B Technical Data (continued) Functions and properties descriptions (continued) (8) Soft start Soft start circuit is incorporated into this IC to avoid high in-rush current during start-up. After the device is enabled (ENB = High), the output inductor current and output voltage will rise slowly from initial condition. This slow start-up time ensure smooth start-up as well as minimize in-rush current ...
Page 27
... AN30888B Technical Data (continued) Functions and properties descriptions (continued) (10) Under Voltage Lock Out (UVLO) Under Voltage lock out prevents IC from operation at supply voltage lower than 2.1 V. This function prevent IC from abnormal operation when supply voltage V voltage is lower than this lock out value of 2.1 V, external MOSFET will be switched off. When input voltage rises to 2 more, device operation starts again ...
Page 28
... AN30888B Technical Data (continued) Functions and properties descriptions (continued) (13) Maximum duty operation Maximum Duty limitation is needed when operating in Boost or Buck- Boost mode. This prevents the output voltage from having abnormal operation. For Buck mode, there is no need for maximum duty limit as SW pin is able to switch to 100% duty. ...
Page 29
... AN30888B Technical Data (continued) ⎯ diagram D a SDG00005AEB 29 ...
Page 30
... AN30888B Usage Notes Special attention and precaution in using 1. This IC is intended to be used for general electronic equipment [LED Lighting Devices]. Consult our sales staff in advance for information on the following applications: Special applications in which exceptional quality and reliability are required the failure or malfunction of this IC may directly jeopardize life or harm the human body ...
Page 31
Request for your special attention and precautions in using the technical information and (1) If any of the products or technical information described in this book exported or provided to non-residents, the laws and regulations of the ...