Electronic Components Datasheet Search |
|
KA35S280-DN Datasheet(PDF) 8 Page - Kasin Electronics Corporation |
|
KA35S280-DN Datasheet(HTML) 8 Page - Kasin Electronics Corporation |
8 / 19 page KA35S280/281 Lead-Acid Battery Charger 2011 Nov 18 © 2011 Kasin Technology Inc. 8 - Pulsed-current charge This algorithm consists of three phases (figure 6): 1. Phase1 - Qualification: The charging current is limited at ICOND (=IMAX/5) until the cell voltage rises to VTH to prevent battery damage. In this condition The KA35S28X enters the Charge Pending state and waits until the battery voltage rises to VTH. Charge Pending is annunciated by LED0 and LED3 flashing. 2. Phase2 - Fast Charge: The charging current is regulated at IMAX (1.25 IMAX when faster pin is 0) until the cell voltage rises to VBLK. 3. Phase3 - Maintenance: Charging current is removed until the battery voltage falls to VFLT; charging current is then restored and regulated at IMAX (1.25 IMAX when faster pin is 0) until the battery voltage once again rises to VBLK. This cycle is repeated indefinitely. V BLK V FLT V TH Time I MAX I COND I MIN I FLT Phase 1 Phase 2 Phase 3 Fast Charge Maintenance Voltage Current Figure 6 – Fast Charge - Temperature monitoring - Temperature compensation The KA35S28X senses temperature by monitoring the voltage of TEMP pin. The KA35S28X assumes a Negative Temperature Coefficient (NTC) thermistor, so the voltage on the TEMP pin is inversely proportional to the temperature (see Figure 7). The temperature thresholds used by the KA35S28X and their corresponding TEMP pin voltage are: TCO Temperature Cut-Off: Higher limit of the temperature range in which charging is allowed. VTCO = 0.12 * VCC. HTF High-Temperature Fault: Threshold to which temperature must drop after Temperature Cut-Off is exceeded before charging can begin again. VHTF = 0.15 * VCC LTF Low-Temperature Fault: Lower limit of the temperature range in which charging is allowed. VLTF = 0.35 * VCC. A resistor-divider network must be implemented that presents the defined voltage levels to the TEMP pin at the desired temperatures (see Figure 8). The equations for determining RT1 and RT2 are: Equation 1: Equation 2: Where: RLTF = Thermistor resistance at LTF RHTF = Thermistor resistance at HTF 1% resistors are recommended. As an example, the resistor values for several temperature windows computed for a 3KΩ thermistor are shown in Table 7. |
Similar Part No. - KA35S280-DN |
|
Similar Description - KA35S280-DN |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |