DL24P Schematic Diagram [PDF]

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DL24P Load Tester Buffer Output to addition Power MOSFET current sources



Power Supply 8-12 vdc 12V



8-12 vdc



STPS41H100CG D1 A2



C7



Current Control 0v to 2.161v



PB1 PWM



R4



R5



10k



10k



R3 3.3k



C2



0.1uF



1



5



+



Vcc



-



Vee



U1



4



LM321



C3



3



0.1uF



Comps for PWM digital line not pulling to ground



0.1uF



R10



68k R12 3.3k



2



R13 150k



Current Control 0v to 0.100v



1 R6



0.1uF



100



uC DAC has only 6 bits so instead uses PWM timer for higher resolution control.



Integrator



C4



PWM filter 0v to 2.161v



R11 C5



0.1uF



100



HOT



100V 2x 20amps



3.3V



3



5



+



Vcc



-



Vee



Q1



1k



+ -



230 nC



C1



2.3 mA drive for 100 usec switch



0.1uF



3.3v Reg.



J5 1 2



V-



FAN



R1a 0.010



ME6203A-3.3V 3.3V U3 Vout 3 Vin C10 C11



V+



Fan+



2



Current Regulator Feedback 12V



R9



Q2



IRFP260 Q1 HOT



R2



4



R8 68k



R7 10k



(reverse protection) K



U2



LM321



A+



12V



A1



T NTC1 10k @ 25degC



R1b 0.010



2



Gnd 1



15uF



Out Monitor



A-



15uF



Current Shunt 0.005 ohms



A+ load MOSFET source



Current Sensing



Current Sensing



Current Sensing



0.1uF



3.3V



3.3V



4800 baud PD0 UART_Rx UART_Tx PD1 R25 1k



VC28 0.1uF



R26 1k



C24



C25



2.2uF



0.1uF



C31 0.1uF



R31 10k



TxD D2



V+



1 2 3 4 n.c. 5 6 7 8



R32 10k RxD D3



UART LED



U5



Gnd TxD RxD V3 UD+ UDXI XO



R27 150k



VBus +5v C32



16



Vcc R232_En 15 14 RTS_b 13 DTR_b 12 DCD_b RI_b 11 DSR_b 10 CTS_b 9



n.c. n.c. n.c. n.c. n.c. n.c. n.c.



0.1uF



3.3V



X2



C29 0.1uF



C33



PB1 PWM



SWD Programming/Debug DVcc Gnd SWDIO SWCLK RESET_b



1 2 3 4 5



C34



12.00 MHz



20pF



20pF



USB Micro Jack



U6 3.3V C43



C42



R41 10k



2.2uF



4.7uF



Reset_b C41 0.1uF



R42 10k



C44 0.1uF



test



1 2 3 4 5 6 7 8 9 10 11 12 13 14



VBus +5v DD+ n.c. ID GND



HC32F030E8PA (64K FLASH, 8K SRAM)



TSSOP28 package Boot0 VCAP1 PC14/32K_In SWCLK/PA14 PC15/32K_Out SWDIO/PA13 PA12 PD0 Tx (uses software ‘bit bang’ UART) 4800 baud PA11 PD1 Rx NRST USART1_RX/PA10 VDDA USART1_TX/PA9 PA8 PA0/ADC_IN0 DVcc PA1 ARM Cortex M0+ DVss PA2 Microcontroller PA3 PB2 PA4/SPI0_CS TIM6/PB1 PA5/SPI0_SCK PB0 PA6/SPI0_MISO SPI0_MOSI/PA7



28 27 26 25 24 23 22 21 20 19 18 17 16 15



R44 R45



120 120



- button



3.3V



3.3V



Setup button



Serial port / DFU programming DVcc Gnd RxD TxD Boot_b



R43 22k* Setup button SW1 - button SW2



U7



3.3V



JDY-23



n.c. 3 n.c. n.c. 4 Out1



R54



PA9/U1Tx PA10/U1Rx



Int5



Int4



t2 EIn



10



11



12



13



14



15



16



n.c.



n.c.



n.c.



n.c.



Int3 18 n.c. AL ED R52



9



n.c.



BT Status LED



R53 120



TxD 19



n.c.



D5



RxD 20



120



n.c. 7 Int7 t3 Ou n.c. 8



EInt1 21 n.c.



cc2541



6 Stat



R51 47



PwrC 22 n.c.



BlueTooth Module



n.c. 5 Out2



n.c.



120



D4



‘S4’ SD102AWS



Reset 23 n.c.



n.c.



Buzzer



R50



LCD



Start button SW4



Gnd 24



1 Vcc



n.c. 2 n.c.



Out6



Spkr1



PA06, SPI0_MISO 3.3v 3.3V 3.3v n.c. PA07, SPI0_MOSI PA04, SPI0_CS PB00, GPIO PA05, SPI0_SCK PC15 GPIO Gnd



1 2 3 4 5



Start button + button



Out7



R24 35k*



1 Osc_O Osc_I 16 n.c. 2 PF DVdd 15 14 3 n.c. DGnd QF 4 AVdd Rx/Rst_N 13 5 Ain2_P Tx 12 6 Ain2_N Ref_V 11 7 Ain2_P Ain3_N 10 8 Ain2_N Ain3_P 9 C23



UART to USB CH340G



VBus +5v



Int6



R23 42k*



20pF



t4 Out5



Ext Temp Thermistor 1 2 Gnd



NTC2 10k @ 25degC



15uF



0.1uF



C27



Ou



C21



C22



3.5798 MHz



20pF



Load Voltage Remote Sensing



J5



R21 100



C26



R22 10



0.1uF



Load Voltage Remote Sensing



X1



3.3V



C20



Fan Control



PC14



(Utility Smart Meter chip)



R20 100



Ext Temp Sensor



MOSFET Temp Sensor



PA00/ADC_IN1



RENERGY RN8209C Three input Sigma Delta ADC



17



47



D6 BT Active



+ button SW3



1 2 3 4 5