Os motores de busca de Datasheet de Componentes eletrônicos |
|
CS5106 Folha de dados(PDF) 8 Page - Cherry Semiconductor Corporation |
|
CS5106 Folha de dados(HTML) 8 Page - Cherry Semiconductor Corporation |
8 / 12 page 8 Block Diagram + - + - + - + - V V V V V V V V V V V OUVDELAY OAOUT OAM VSS Aux. Error Amp A1 1.2V + 5k 45k VCC D1 Output Undervoltage Timer V5REF 100k P1 RUN1 RUN 2 G6 C9 VREFOK VFB1 SYNCIN PROGRAM ENABLE UVSD SYNCOUT DYLSET FADJ RAMP2 GATE2 GATE2B ILIM2 VFB2 A2 A2 G1 VREFOK RUN 1 VSS G7 G3 C1 G8 FREQ TOO LOW Aux.PWM Comparator VREFOK Comparator Main PWM Comparator Sync Detection Main 2nd Current Threshold Comparator Aux. 2nd Current Threshold Comparator Aux. Current Limit Comparator Main Current Limit Comparator C11 1.2V V Skip Two Clock Pulses SET CLOCK SET CLOCK Skip Two Clock Pulses G15 C17 C16 Skip2B G14 G18 1.4V GATE1 Gnd ILIM1 RSFF QR F2 S TPERIOD DRIVER C10 C12 C13 OSC IFSET CLK1 CLK2 IDSET SYNCIN SYNCOUT C8 C5 OVSD + - G13 C14 G16 G17 C15 DELAY DELAY G12 RUN2 RUN2 1.7V + DRIVER Reset Dominant G11 G10 G9 VREF ENABLE VREF=5V VCC 5V C2 RSFF RQ S F1 Set Dominant + - Over Voltage Comparator VSS Restart Comparator Reset Dominant RSFF Q F3 S R Reset Dominant RSFF Q F4 S R + - C4 - + C7 Skip2B ENABLE Comparator Under Voltage Comparator R 2R G5 G4 DRIVER TFF T1 Q + 0.13V 0.13V + START STOP R 2R RUN1 + 1.5V Fault Latch C3 + - FREQ TOO HIGH 1.4V 5V 4.5 7.4/6.8V 1.4V RAMP1 1.4V Q Theory of Application Powering the IC The IC has one supply, VCC, and one Ground lead. If VSS is used for a bootstrapped supply the diode between VSS and VCC is forward biased, and the IC will derive its power from VSS. The internal logic monitors the supply voltage, VCC. During abnormal operating conditions, all GATE drivers are held in a low state. The CS5106 requires 1.5mA nominal of startup current. Startup Assume the part is enabled and there are no over voltage or under voltage faults present. Also, assume that all auxil- iary and main regulated output voltages start at 0V. An 8V, Zener referenced supply is typically applied to VCC. When VCC exceeds 7.5V, the 5V reference is enabled and the OSC begins switching. If the V5REF lead is not exces- sively loaded such that V5REF < 4.5V nominal, ÔVREFOKÕ goes ÔhighÕ and ÔRUN1Õ will go ÔhighÕ, releasing GATE1 from its low state. After GATE1 is released, it begins switching according to conditions set by the auxiliary con- trol loop and the auxiliary supply, VSS begins to rise. When VSS > VCC + V(D1), P1 turns on and ÔRUN2Õ goes ÔhighÕ, releasing GATE2 and GATE2B from their low state. GATE2 and GATE2B begin switching according to condi- tions set by the main control loop and the main regulated output begins to rise. See startup waveforms in Figure 1. Soft Start Soft start for the auxiliary power supply is accomplished by placing a capacitor between OAOUT and Ground. The error amplifier has 200µA of nominal of source current and is ideal for setting up a Soft Start condition for the auxiliary regulator. Care should be taken to make sure that the soft start timing requirements are not in conflict with any tran- sient load requirements for the auxiliary supply as large capacitors on OAOUT will slow down the loop response. Also, the Soft start capacitor must be chosen such that dur- ing start or restart, both outputs will come into regulation before the OUVDELAY timer trips. Soft Start for the main supply is accomplished by charging soft start capacitor C6 through D5 and R7 at start up. After the main supply has come into regulation C6 continues to charge and is discon- nected from the feedback loop by D8. Theory of Operation |
Nº de peça semelhante - CS5106 |
|
Descrição semelhante - CS5106 |
|
|
Ligação URL |
Privacy Policy |
ALLDATASHEETPT.COM |
ALLDATASHEET é útil para você? [ DONATE ] |
Sobre Alldatasheet | Publicidade | Contato conosco | Privacy Policy | roca de Link | Lista de Fabricantes 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 |