LM2576HVR-12 TI高压三端稳压器 - 图文 

6.5 Electrical Characteristics: 3.3 V

Specifications are for TJ = 25°C (unless otherwise noted). TEST CONDITIONS SYSTEM PARAMETERS TEST CIRCUIT Figure 26 and Figure 32(1) Output Voltage PARAMETER MIN TYP MAX UNIT 3.234 3.3 3.366 VIN = 12 V, ILOAD = 0.5 A Circuit of Figure 26 and Figure 32 6 V ≤ VIN ≤ 40 V, 0.5 A ≤ ILOAD ≤ 3 A Figure 32 6 V ≤ VIN ≤ 60 V, 0.5 A ≤ ILOAD ≤ 3 A Figure 32 VIN = 12 V, ILOAD = 3 A Circuit of Figure 26 and Circuit of Figure 26 and V Output Voltage: LM2576 TJ = 25°C Applies over full operating 3.168 3.135 3.3 3.432 3.465 V V OUT Output Voltage: LM2576HV temperature range TJ = 25°C Applies over full operating 3.168 3.135 3.3 3.45 3.482 V η Efficiency temperature range 75% (1) External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance.

When the LM2576/LM2576HV is used as shown in Figure 26 and Figure 32, system performance is as shown in Electrical Characteristics: All Output Voltage Versions.

6.6 Electrical Characteristics: 5 V

Specifications are for TJ = 25°C for the Figure 26 and Figure 32 (unless otherwise noted). TEST CONDITIONS SYSTEM PARAMETERS TEST CIRCUIT Figure 26 and Figure 32(1) VIN = 12 V, ILOAD = 0.5 A VOUT Output Voltage Circuit of Figure 26 and Figure 32 VOUT PARAMETER MIN TYP MAX UNIT 4.9 4.8 5 5 5.1 5.2 5.25 V V Output Voltage LM2576 0.5 A ≤ ILOAD ≤ 3 A, 8 V ≤ VIN ≤ 40 V VOUT Circuit of Figure 26 and Figure 32 0.5 A ≤ ILOAD ≤ 3 A, 8 V ≤ VIN ≤ 60 V TJ = 25°C Applies over full operating temperature range TJ = 25°C Applies over full operating temperature range 4.75 4.8 5.225 Output Voltage LM2576HV Efficiency 5 4.75 5.275 V η Circuit of Figure 26 and Figure 32 VIN = 12 V, ILOAD = 3 A 77% (1) External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance.

When the LM2576/LM2576HV is used as shown in Figure 26 and Figure 32, system performance is as shown in Electrical Characteristics: All Output Voltage Versions.

6.7 Electrical Characteristics: 12 V

Specifications are for TJ = 25°C (unless otherwise noted). TEST CONDITIONS SYSTEM PARAMETERS TEST CIRCUIT Figure 26 and Figure 32(1) VIN = 25 V, ILOAD = 0.5 A VOUT Output Voltage Circuit of Figure 26 and Figure 32 PARAMETER MIN TYP MAX UNIT 11.76 12 12.24 V V VOUT Output Voltage LM2576 0.5 A ≤ ILOAD ≤ 3 A, 15 V ≤ VIN ≤ 40 V Circuit of Figure 26 and Figure 32 and 0.5 A ≤ ILOAD ≤ 3 A, 15 V ≤ VIN ≤ 60 V TJ = 25°C Applies over full operating temperature range TJ = 25°C Applies over full operating temperature range 11.52 12 12.48 12.6 11.4 11.52 11.4 VOUT Output Voltage LM2576HV 12 88% 12.54 12.66 V η Efficiency Circuit of Figure 26 and Figure 32 VIN = 15 V, ILOAD = 3 A (1) External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance.

When the LM2576/LM2576HV is used as shown in Figure 26 and Figure 32, system performance is as shown in Electrical Characteristics: All Output Voltage Versions.

6.8 Electrical Characteristics: 15 V

PARAMETER over operating free-air temperature range (unless otherwise noted). TEST CONDITIONS SYSTEM PARAMETERS TEST CIRCUIT Figure 26 and Figure 32(1) VIN = 25 V, ILOAD = 0.5 A VOUT Output Voltage Circuit of Figure 26 and Figure 32 VOUT MIN TYP MAX UNIT 14.7 14.4 15 15 15.3 15.6 15.75 V V Output Voltage LM2576 0.5 A ≤ ILOAD ≤ 3 A, 18 V ≤ VIN ≤ 40 V Circuit of Figure 26 and Figure 32 0.5 A ≤ ILOAD ≤ 3 A, 18 V ≤ VIN ≤ 60 V TJ = 25°C Applies over full operating temperature range TJ = 25°C Applies over full operating temperature range 14.25 14.4 15.68 VOUT Output Voltage LM2576HV Efficiency 15 14.25 15.83 V η Circuit of Figure 26 and Figure 32 VIN = 18 V, ILOAD = 3 A 88% (1) External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance.

When the LM2576/LM2576HV is used as shown in Figure 26 and Figure 32, system performance is as shown in Electrical Characteristics: All Output Voltage Versions.

6.9 Electrical Characteristics: Adjustable Output Voltage

over operating free-air temperature range (unless otherwise noted). TEST CONDITIONS SYSTEM PARAMETERS TEST CIRCUIT Figure 26 and Figure 32(1) VIN = 12 V, ILOAD = 0.5 A VOUT Feedback voltage VOUT = 5 V, Circuit of Figure 26 and Figure 32 PARAMETER MIN TYP MAX UNIT 1.193 1.217 1.18 1.23 1.243 V VOUT Feedback Voltage LM2576 0.5 A ≤ ILOAD ≤ 3 A, 8 V ≤ VIN ≤ 40 V VOUT = 5 V, Circuit of VOUT Figure 26 and Figure 32 Feedback Voltage LM2576HV Efficiency 0.5 A ≤ ILOAD ≤ 3 A, 8 V ≤ VIN ≤ 60 V TJ = 25°C Applies over full operating temperature range TJ = 25°C Applies over full operating temperature range 1.23 1.267 1.28 V 1.193 1.18 1.23 1.273 1.286 V VOUT = 5 V, Circuit of η Figure 26 and Figure 32 VIN = 12 V, ILOAD = 3 A, VOUT = 5 V 77% (1) External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance.

When the LM2576/LM2576HV is used as shown in Figure 26 and Figure 32, system performance is as shown in Electrical Characteristics: All Output Voltage Versions.

6.10 Electrical Characteristics: All Output Voltage Versions

over operating free-air temperature range (unless otherwise noted) TEST CONDITIONS SYSTEM PARAMETERS TEST CIRCUIT Figure 26 and Figure 32(2) PARAMETER MIN TYP(1) MAX UNIT 100 Ib Feedback Bias Current VOUT = 5 V (Adjustable Version Only) TJ = 25°C Applies over full operating temperature range 50 nA 500 fO Oscillator Frequency(3) TJ = 25°C 47 42 52 58 63 kHz Applies over full operating temperature range (1) All limits specified at room temperature (25°C) unless otherwise noted. All room temperature limits are 100% production tested. All limits

at temperature extremes are specified through correlation using standard Statistical Quality Control (SQC) methods.

(2) External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance.

When the LM2576/LM2576HV is used as shown in Figure 26 and Figure 32, system performance is as shown in Electrical Characteristics: All Output Voltage Versions.

(3) The oscillator frequency reduces to approximately 11 kHz in the event of an output short or an overload which causes the regulated

output voltage to drop approximately 40% from the nominal output voltage. This self protection feature lowers the average power dissipation of the IC by lowering the minimum duty cycle from 5% down to approximately 2%.

Electrical Characteristics: All Output Voltage Versions (continued)

over operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP(1) 1.4 MAX UNIT 1.8 2 V VSAT Saturation Voltage IOUT = 3 A (4) TJ = 25°C Applies over full operating DC I Max Duty Cycle (ON)(5) Current Limit(4)(3) temperature range 93% 4.2 98% 5.8 CL C TJ = 25° 6.9 7.5 IL I Q Applies over full operating temperature range Output = 0 V Output Leakage Current Output = ?1 V (6)(7) Output = ?1 V 3.5 2 A mA mA μA 7.5 5 50 30 10 Quiescent Current(6) ISTBY Standby Quiescent Current ON /OFF Pin = 5 V (OFF) 200 ON /OFF CONTROL TEST CIRCUIT Figure 26 and Figure 32 TJ = 25°C Applies over full operating 2.2 2.4 1.4 VIH VOUT = 0 V V ON /OFF Pin V Logic Input Level VOUT = Nominal Output temperature range TJ = 25°C Applies over full operating IL Voltage 1.2 1 0.8 V I IH temperature range 12 0 30 10 μA μA IIL ON /OFF Pin Input ON /OFF Pin = 5 V (OFF) Current ON /OFF Pin = 0 V (ON) (4) (5) (6)

Output pin sourcing current. No diode, inductor or capacitor connected to output. Feedback pin removed from output and connected to 0V.

Feedback pin removed from output and connected to +12 V for the Adjustable, 3.3-V, and 5-V versions, and +25 V for the 12-V and 15-V versions, to force the output transistor OFF.

(7) VIN = 40 V (60 V for high voltage version).

6.11 Typical Characteristics

(Circuit of Figure 26 and Figure 32)

Figure 1. Normalized Output Voltage Figure 2. Line Regulation

Figure 3. Dropout Voltage Figure 4. Current Limit

Figure 5. Quiescent Current Figure 6. Standby Quiescent Current

Typical Characteristics (continued)

(Circuit of Figure 26 and Figure 32) Figure 11. Quiescent Current versus Duty Cycle

Figure 12. Feedback Voltage versus Duty Cycle

Figure 7. Oscillator Frequency

Figure 8. Switch Saturation Voltage

Figure 10. Minimum Operating Voltage

Figure 9. Efficiency