LB1939T

Ordering number : ENN6194 Monolithic Digital IC LB1939T 2 Channel H Bridge Constant Voltage/ Constant Current Driver IC Overview The LB1939T is a two-phase excitation bipolar stepping motor driver that features low voltage operation, a low saturation voltage, and low power consumption. It supports constant voltage and constant current drive, can control two iris motors, and is optimal for shutter, iris, and AF drive in 3 V battery operated still digital cameras and other battery operated equipment. Package Dimensions unit: mm 3246-TSSOP20 [LB1939T] 20 11 0.5 4.4 6.4 0.08 (1.0) 1.2max 0.15 6.5 Features • Low-voltage drive — Dual power supply operation: VS = 1.6 to 7.5 V, VDD = 1.9 to 6.5 V — Single power supply operation: VS = VDD = 1.9 to 7.5 V • Low saturation voltage output: Vosat = 0.3 V at IO = 200 mA • Supports constant voltage and constant current drive • Built-in reference voltage circuit (Vref = 0.9 V) • Miniature, thin form package (Thickness t = 1.1 mm) 0.65 (0.33) 1 0.22 10 SANYO: TSSOP20 Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Maximum supply voltage Applied output voltage Maximum output current: OUT1, 2, 3, and 4 Applied input voltage Allowable power dissipation Operating temperature Storage temperature Symbol VBmax VOUT IOmax VIN Pdmax Topr Tstg VS1, VS2, VDD OUT1, 2, 3, 4 t ≤ 10 ms ENA, IN, VC When mounted on a printed circuit board* Conditions Ratings –0.3 to +10.5 –0.3 to +10.5 400 10.5 0.8 –20 to +85 –55 to +150 Unit V V mA V W °C °C Note: Circuit board: 114.3 × 76.1 × 1.6 mm3 glass epoxy board Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft’s control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications. SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO products described or contained herein. SANYO Electric Co.,Ltd. Semiconductor Company TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN 22704TN (OT) No. 6194-1/7 LB1939T Allowable Operating Conditions at Ta = 25°C Parameter Operation guaranteed voltage range 1 Operation guaranteed voltage range 2 Input low-level threshold voltage Input high-level threshold voltage Symbol VOPR1 VOPR2 VIL VIH Conditions VDD system, VS = 2.0 V VS system, VDD = 5.0 V ENA1, ENA2, IN1, IN2 ENA1, ENA2, IN1, IN2 Ratings min 1.9 1.6 –0.3 2.0 typ max 6.5 7.5 +1.0 6.0 Unit V V V V Electrical Characteristics at Ta = 25°C, VS = 3.0 V, VDD = 5.0 V Parameter Standby mode current drain [Regulator Output Circuit] VREF output voltage SVDD output voltage [H Bridge Output Circuit] OUT pin output saturation voltage 1 (Saturation control mode) OUT pin output saturation voltage 2 (Saturation control mode) OUT pin output voltage 1 (Constant voltage control mode) OUT pin output voltage 2 (Constant voltage control mode) OUT pin output current 1 (Constant current control mode) OUT pin output current 2 (Constant current control mode) VS system operating current drain 1 VS system operating current drain 2 VDD system operating current drain 1 VDD system operating current drain 2 VC input voltage range VC input current [Control Input Circuit] Control pin maximum input current IIH IIL VIH = 5.5 V VIL = GND –1 70 100 0 µA µA Vosat1 Vosat2 VOUT1 VOUT2 IOUT1 IOUT2 IS1 IS2 IDD1 IDD2 VC IVC VDD = 6.0 V, VS = 2.0 V, VC = 5.0 V VDD = 5.0 V, VC = SVDD, VS = 2.0 V IO = 200 mA (PNP transistor side) VDD = 5.0 V, VC = SVDD, VS = 2.0 V IO = 200 mA (NPN transistor side) VDD = 6.0 V, VC = 1.5 V, VS = 3.5 V IO = 200 mA (PNP transistor side) VDD = 6.0 V, VC = VREF, VS = 2.0 V IO = 200 mA (PNP transistor side) VDD = 6.0 V, VC = 0.9 V, VS = 3.5 V RL = 5 Ω (between OUT and OUT), RFB = 1 Ω VDD = 6.0 V, VC = VREF, VS = 2.0 V RL = 5 Ω (between OUT and OUT), RFB = 1 Ω VC = SVDD VC = VREF VC = SVDD ENA1 = 2 V VC = VREF ENA1 = 2 V 0.1 0 50 2.8 1.65 197 189 0.20 0.10 2.9 1.75 210 210 4 1.5 4 4 0.30 0.15 3.0 1.85 223 231 7 3 7 7 7 100 V V V V mA mA mA mA mA mA V µA VREF VSVDD IOL = 0 to 1 mA IOL = 10 mA 0.85 4.7 0.9 4.8 0.95 V V Symbol ISTB VS = VDD = 6.5 V Conditions Ratings min typ 0.1 max 1.0 Unit µA Pd max — Ta Allowable power dissipation, Pdmax — W 1 Mounted on a 114.3 × 76.1 × 1.6 mm glass-epoxy printed circuit board 0.8 0.6 0.4 0.2 0 –20 0 20 40 60 80 100 Ambient temperature, Ta — °C No. 6194-2/7 LB1939T Truth Table Input ENA 1 L H 2 L H L H H L L H H L L H H L on on on on 1 IN 2 1 2 OUT 3 4 Output SVDD Mode Standby mode (zero current drain) Channel 1: reverse Channel 1: forward Channel 2: reverse Channel 2: forward Blank entries indicate “don’t care” states. Blank entries indicate off states. Pin Assignment VC1 S-GND 1 2 20 VS1 19 SVDD 18 VDD 17 OUT1 16 RFG1 VC2 Vref ENA1 3 4 5 LB1939T ENA2 IN1 IN2 FC1 6 7 15 OUT2 14 OUT3 13 RFG2 12 OUT4 11 VS2 Top view 8 9 FC2 10 No. 6194-3/7 Block Diagram VC1 OUT1 OUT2 VDD OUT4 OUT3 VS2 VS1 VC2 70 KΩ 70 KΩ 20 KΩ VDD-SW 20 KΩ LB1939T Reference voltage logic circuit SVDD Vref = 0.9 V RFG2 65 KΩ 80 KΩ 65 KΩ 80 KΩ 65 KΩ 80 KΩ 65 KΩ 80 KΩ FC2 S-GND FC1 RFG1 ENA1 ENA2 IN1 IN2 No. 6194-4/7 LB1939T Application Circuit Example 1 VDD ENA1 ENA2 CPU IN1 VS2 VS1 OUT1 OUT2 LB1939T OUT3 OUT4 IN2 S-GND SVDD Vref VC1 VC2 RFG1 RFG2 Constant voltage control mode: OUT outputs a 1.75 V, which is Vref (0.9 V) × 1.95. * : FC1 and FC2 are left open. Application Circuit Example 2 VDD ENA1 VS2 VS1 OUT1 ENA2 CPU IN1 LB1939T IN2 S-GND SVDD OUT2 OUT3 OUT4 FC1 FC2 Vref VC1 VC2 RFG1 RFG2 Constant current control mode: The RFG voltage is controlled so that Vref/4.5 = 0.2 V. Therefore, when RfB is 1 Ω, the circuit operates in constant current drive with Icoil = 0.2 V/1 Ω = 200 mA. *: There are no magnitude constraints on the inputs (ENA, IN) and the supply voltages (VDD, VS). For example, the IC can be operated at VIN = 5 V, VDD = 3 V, and VS = 2 V. No. 6194-5/7 LB1939T Application Circuit Example 3 VDD ENA1 ENA2 CPU IN1 VS2 VS1 OUT1 OUT2 LB1939T OUT3 OUT4 FC2 IN2 S-GND SVDD 6 kΩ 3 kΩ VC1 Vref VC2 RFG1 RFG2 Channel 1 operates in constant voltage control mode: OUT outputs VDD × 3K/(3K + 6K) × 1.95 Channel 2 operates in constant current control mode: The RFG voltage is controlled so that Vref/4.5 = 0.2 V. * : FC1 is left open. Notes on Constant Current Control Settings The LB1939T constant current control circuit has the structure shown in the figure at the right. The voltage input to the VC pin is resistor divided internally (by 70 kΩ and 20 kΩ resistors) to 1/4.5 and input to the plus (+) input of the constant current control amplifier as reference. The minus (–) input of this constant current control amplifier is connected, through the wire bond resistor Rb (= 0.1 Ω), to the RFG pin. The constant current control circuit operates by comparing the voltage generated by the external current detection resistor connected to the RFG pin and the reference voltage mentioned above. Note that the voltage at VA will be that given by the following formula since the bias current Ib (= 1.5 µA) flows from the constant current control amplifier plus (+) input during constant current control operation. VA = VC/4.5 + Ib × 20 kΩ = VC/4.5 + 0.03 Therefore, the logical expression for setting the constant current Iout is as follows. Iout = VA/(RFB + Rb) = (VC/4.5 + 0.03) / (RFB + Rb) ......(1) 70 kΩ VS VC Constant current control amplifier VA RL 20 kΩ Ib = 1.5 µA OUT1 Iout OUT2 Pad Rb = 0.1 Ω RFG RFB A13864 No. 6194-6/7 LB1939T Constant Current Control Usage Notes This IC supports both constant current control and constant voltage control modes. However, since both of these control circuits operate at all times, certain of the limitations imposed by the constant voltage control circuit apply may when using constant current control. For example, if constant current control is used with the application circuit shown in figure 2, if VC = 0.9 V (= Vref) and RFB = 1 Ω, then the output current can be calculated as follows from (1) on the previous page. Iout = (0.9/4.5 + 0.03) / (1 + 0.1) = 0.23/1.1 ≈ 0.209A Here, if the value driven load resistance RL is r, since the RFG pin voltage is 0.23 V and the npn transistor output saturation voltage is 0.1 V (typical), the pnp transistor output pin voltage can be calculated as follows. Vout = (RFG pin voltage) + (npn transistor output saturation voltage) + (voltage across the load terminals) = 0.23 + 0.1 + 0.209 × r = 0.3 + 0.209r At the same time, however, this IC’s internal constant voltage control circuit controls the output voltage as follows. Vout' = VC × 1.95 ≈ 1.75 V Therefore, it will not be possible to use the constant current control mode if the value of r is set so that Vout is greater than Vout'. That is, the condition 0.33 + 0.209r > 1.75 implies that r > 6.79 This means that constant current control can be used when the value of the load resistance used is strictly less than 6.79 Ω. Specifications of any and all SANYO products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer’s products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer’s products or equipment. SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all semiconductor products fail with some probability. It is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO products (including technical data, services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be exported without obtaining the export license from the authorities concerned in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of SANYO Electric Co., Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the “Delivery Specification” for the SANYO product that you intend to use. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of February, 2004. Specifications and information herein are subject to change without notice. PS No. 6194-7/7